\in\i.i: 5 







arc present ; but irregular -liall>\\ furrows are formetl by eoutractiuti in these preserved 

 specimens. In all cases the tentacle* exposed, aud they agree generally with the 

 description given by MrMurrirh, in hia account of the species (10, p. 247) from a 

 -|M-,'!ni,-n iV-. in i 'album, both as regards number and arrangement and relative size. 



Tin- irsophagus is generally widely expanded, and in the majority of the 

 specimens is alm<>-t indistinguishable from the portion of the oral disc inside the 

 tentacles. But in one of the more contracted specimens the lip of the oesophagus is 

 easilv distinguished, but the corrugations are continued radially over the oral disc, 

 running between aud a short distance up the bases of the tentacles. The siphonoglyphs 

 are in no case well marked. The foot-disc is well-marked and strongly adherent. 



The more minute anatomy agrees generally with McMurrich's description. The 

 mesogloea of the body-wall is variable in thickness, and in one specimen, just 

 l>elow the sphincter, is nearly 2 mm. thick, from which in an upward direction it thins 

 rapidly to less than 1 mm. The mesogloeal sphincter exhibits no trace of layering, 

 having a simple reticulate structure in transverse section. Transverse sections of the 

 tentacles exhibit the same appearance of portions of the ectodermnl epithelium licing 

 cut off and apparently enclosed in the mesogloea, as descril>ed by McMurrich, due to 

 contraction and the unusual thickness of the mesogloeal layer. 



The mesenteries in manlier and arrangement agree with McMurrich's descrip- 

 tion, but I cannot confirm the hermaphroditic condition described for the species. 

 In the specimen selected for histological work no spermatozoa were found, and the 

 ova were large and well-developed. Otherwise the ' Discovery ' specimens agree 

 well with McMurrich's description, and I have no hesitation in placing them under 

 this species. 



FAMILY ALICIID.& DUKRDKN (1895). 



A' ri N IAKIA with a large, flat, contractile base. Tentacles simple, cylindrical and 

 entacmteous. Column wall with simple or compound hollow tultercles or vesicles, 

 covering the greater part of the column, arranged mostly in vertical rows. Sphincter 

 muscle endodermal and diffuse, variable in amount of development. No cinclides or 

 acontia, margin with or without acroragL Mesenteries arranged in several cycles of 

 which usually more than one is perfect 



Genus CYSTIACTIS, M. Edw. 



Aliriidiu having the column covered with simple vesicles. Tentacles of variable 

 length, in one, two, or three cycles. Numerous perfect mesenteries ; sphincter muscle 

 moderately well developed. 



( YVHACTIS ANTARCTICA. 



A single specimen, bearing the label " McMurdo Bay, Winter Quarters, 28.2.02." 

 Depth, 20 fathoms. 



z 2 



