Tnnicata. ig^ 



"Cape Adare, 25th January, washed up on heaeU," twenty 

 specimens. 



"Cape Adare, 7-10 fathoms, 23rd January, 30° Fahr.," five 

 specimens. 



" Cape Adare, 2lst January, 1900, washed up on ])each," twenty 

 specimens. 



"Cape Adare, 5th January, 1900, on the beach," eleven colonies. 



A well-grown colony measures 9x4x3 cm., another is 

 6x2x2 cm. The longest is 10 cm., and some of the smallest are 

 nearly globular, being about 2*5 x 2 cm. They are all of a dark 

 grey colour, and are very hard and solid to the feel. The test is 

 very compact, and in many cases no trace of ascidiozooids can be 

 seen unless the colony is cut open. In sections they show as long 

 yellow bodies in the grey test. 



A few of the colonies were evidently attached by one end, others 

 apparentl}^ near the middle, but many not at all — probably most lay 

 free on the bottom. 



In many cases the colony is the same in character all over its 

 surface, but in others (see figs. 9 and 10) the lower parts may be 

 much wrinkled and rougher, forming a stalk for the upper end or 

 " head," whicli is of a lighter grey, and softer, and shows the anterior 

 ends of the ascidiozooids distinctly. The liranchial sac is large, and 

 shows many large stigmata. 



Polyelinum adareanum. (Plate XXII., ligs. l-i».) 



External appearance. — Colony large, globular or pear-shaped, with 

 a rounded upper end. The lower end is rather narrower and may be 

 wrinkled and incrusted with sand. 



Test. — Grey, tougli ; firmer on the surface where it forms a 

 cuticle, softer inside, looser in texture on the top of the colony, and 

 strengthened with sand in the lower part. 



Ascidiozooids arranged in systems of eight or ten in a circle round 

 a common cloaca. 



BraAichial sax, with about twenty rows of numerous small stigmata. 

 There are very strong muscle bands in the transverse vessels. 



Lang nets. — A row of short curved tentacle-like processes, shorter 

 than their distance apart and not flattened. 



Localitij. — " Cape Adare, 6th April, 1899, washed up on beach," 

 half-a-dozen colonies ; and " Cape Adare, 21st January, 1900, 

 washed up on beach," one colony. This last colony measures 

 9*5 X 6'5 X 3-5 cm., while the largest of the series is 14 x 12 x 10 

 cm., and the smallest 6x4x3 cm. ; the rest are all about 



2 



