By George A & Wallen, I Eugene (Eds) Llano

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Published by way of the yank Geophysical Union as a part of the Antarctic learn Series.

Of the volumes presently to be had within the Antarctic study sequence, this quantity is the fourth facing the biology of the antarctic seas. those accrued papers contain the result of unique investigations, eleven of that are involved in most cases with the id and distribution of marine vegetation and animals. within the first of those papers Stewart Springer provides a scientific appraisal of the 5 species of elasmobranch Rajidae from Antarctica, of which one represents a brand new and specific species. Heretofore one of many peculiarities of the antarctic ichthyological fauna has been the absence of sharks. during this very major contribution, the writer establishes the main southerly checklist for any member of the elasmobranchs. the second one paper, by way of Patricia Kott, amplifies our systematic wisdom of the tunicates of the South Atlantic, South Pacific, and Indian oceans. It extends her monograph released as quantity thirteen of the study sequence lower than the name of Antarctic Ascidiacea and relies on collections made within the Antarctic via 1967; new species are incorporated. Additions and corrections to quantity thirteen are appended to this paper. John C. Markham stories on a number of reduce chordates of the genus Cephalodiscus and discusses the systematics and distribution of the 5 species recognized from the Antarctic. The Deep Freeze fabrics tested during this research have been received during the U.S. military Hydrographic workplace oceanographers from icebreakers assigned to job strength forty three sooner than and after the 1955-1959 overseas Geophysical 12 months and precede the nationwide technology beginning subsidized study now being carried out through the USNS Eltanin and the R/V Hero lower than the U.S. Antarctic learn application.

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1003 verse vesselsinsteadof the 2 previouslydescribed (210-220 meters). The gonadsin this specimenextend from the gut loop into the anteriorpart of the poste- Distribution. Previouslyknown from a single specirior abdominalextension. 1571; andinthe it wasprobably less thanthatrecorded above. 1621allzooids aredisintegrated present specimens extend therange down totheScotia andtheirstructure is notdiscernible. In all coloniesRidge. exceptthat from Sta. The coloniesform large,roundedbut hardertestthan previouslydescribed for this species.

The specieshas been taken south of South Georgia Description. and at Kerguelen. Thetestis glassyandtransparent andcontains some Description. Thereis a largecommon cloacal open- thestomach wall. Onlyin thespherical colonies from ing in the middle of the upper surfaceof the head. the South Shetland Islands and east of the South Zooidsare small, and in these specimens there are no intactthoraces. Thereare four distinctstomach folds and a shortposteriorabdomenequal in length to the abdomen. The ovary is anteriorto the testislobes.

Themajority ofthepresent colonies are circumvolutum, which have been taken alsoat this identical withthose described byMillar[1960] from station. Thezooids ofthepresent species are,how-South Georgia' clavate colonies, joined basally with ever, quite distinctivein the undivided condition a semitransparent test and no differentiationbetween ofthesmall atrial lobe anditsrelation totheatrialthestalk andthehead. Some ofthespecimens, how- siphon,as well as in the form of both the branchial ever, have a harder and less transparenttest, espe- andatrial siphons withtheirstrong circular sphincter cially onthestalk, andmore crowded zooids.

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