HOLOTHURTOTPEA. 197 



The smaller specimen is evidently of the same species, although its small size and 

 its contracted condition prevent me from verifying all the characters in detail. 

 This species is new to the Ceylon fauna. 

 Distribution : Australia, Ceylon. 



Colochirus, sp. (?). 



Navakaddua Paar (Stn. LXVIIL), 8-181 fathoms. 



This specimen, which is only 7 minims, long, is too small to identify with any 

 certainty. The general external form of the body, together with the nature of the 

 deposits, leads to the conclusion that it is a Colochirus. 



The body is quadrangular, having the pedicels on the trivium arranged in three 

 double rows. The body tapers at the posterior end. 



Deposits : These consist of reticulate cups, knobbed buttons, and very large 

 perforated plates. 



The specimen is evidently young, but does not obviously fall into any of the other 

 species. It is perhaps nearest to C. doliolum, but diffei's in the tapering posterior 

 extremity. 



Havelockia herdmani, n. gen. et sp. Plate II., figs. 31-35. 



One specimen from South of Adam's Bridge (Stn. LIV.), 4-40 fathoms. 



Length 45 millims. and greatest breadth 17 millims. 



The colour of the spirit specimen is brown with a dark streak of violet along the 

 middle of each side. 



The body is indistinctly quadrangular, but pentagonal at each end. The mouth is 

 surrounded by five valves and there are five smaller valves around the anus. 



The ambulacral appendages consist of pedicels and papillae. The pedicels are 

 confined to the ventral surface. They are arranged in three series traversing the 

 entire length of the ventral surface from the mouth to the anus. The central series 

 consists of about eight rows of pedicels, and the other two series are not quite so 

 broad. There are also a few scattered pedicels on the ventral interambulacra. The 

 papillae are absent on the ventral surface, but are scattered irregularly over the 

 remaining three sides, being most thinly scattered along the middle of the sides 

 (fig. 31). The anus is devoid of calcareous teeth. 



The tentacles are not present. They have evidently been thrown off. 



Deposits : These consist entirely of numerous tables, which are of two kinds : 



(1) Those scattered throughout the skin generally. These are small tables, 

 generally having four large holes and four smaller peripheral holes (fig. 32). 

 The number of the holes, however, varies. The spire is made up of two rods 

 which unite at the top and give off generally four short projections (fig. 331 



