110 PROF. A. BENDY AND MR. E. HINDLE : ADDITIONS TO 



accompanying drawing (fig. B) and also gradations between them. It will 

 be seen from this figure that the range o£ variation is such as to include both 

 varieties which Perrier figures for his Caudina pulcliella. 



On the other hand, the exact agreement of the calcareous ring, spiculation, 

 general form of the body, number of tentacles, and, finally, the fact that 

 Perrier's two specimens also come from New Zealand, convince us that 

 Caudina pulchella, R^my Perrier, is not distinct from Caudina coinacea, 

 Hutton. 



Chirodota gigas, sp. n. (Plate 12. figs. 9-11.) 



The following description is taken from a single individual, collected at the 

 Chatham Islands by Prof. H. B, Kirk. Unfortunately, it had broken into 

 three pieces, and, in addition, ejected most of its gut, before it came into our 

 possession. 



The fragments when put together measure as much as 11*3 cms. in length, 

 with a maximum transverse diameter of 1*2 cms. The body tapers posteriorly 

 to a transverse diameter of 0'7 cm. at the extremity. As these measurements 

 were made on a spirit-specimen, the living animal must have been very large 

 for a Chirodota. 



The body is elongated and cylindrical, attaining the greatest diameter 

 immediately behind the anterior extremity. This region of the body is 

 thickly covered by small round papillae. The number of these papillae 

 gradually diminishes posteriorly, while they unite to form somewhat vermi- 

 form prominences which are most abundant in the middle of the body and 

 disappear towards the posterior extremity. In this latter region the papillae 

 are again small and round, resembling those of the anterior part of the body. 

 All these papillae contain aggregations of the characteristic wheel-shaped 

 spicules. 



At the anterior end is a circle of twelve pinnate tentacles, whose digiti- 

 form processes are arranged in a single row along each side of a wide stem. 

 These processes increase in length distally, the terminal pair being usually 

 about three times the length of the proximal pair. The number on each 

 tentacle varies from twelve to fourteen (i. e., six or seven pairs). The 

 retracted tentacles are situated in a funnel-shaped depression, at the bottom of 

 which is the mouth. 



The body-wall is thickest at the anterior end, and here the aggregations of 

 wheels are very numerous. Posteriorly it becomes thin and semitransparent, 

 and the wheel-bearing prominences are very conspicuous. 



There are four kinds of spicules : — 



(i.) Small six-rayed wheels (figs, llc-11^.), which are commonly 0"1 mm. 

 in diameter, but vary from 0'08 mm. up to 0'13 mm. In structure these 



