102 PROF. A. DENDY AND MR. E. HIKDLE : ADDITIONS TO 



In both specimens the tail is paler than the remainder of the body, which 

 is brown in alcohol. 



As the anatomy o£ this species has never been fully described, we append 

 the following- particulars : — 



There are twenty tentacles, five pairs of large alternating with five pairs of 

 small, the latter being internal to the former. 



The pharynx is very long and is supported by a large calcareous ring- 

 composed of ten plates, each made up of a number of small polygonal pieces. 

 This ring has already been figured in detail by one of us *. A distinction 

 between radials and inter-radials is only obvious in the anterior third of the 

 ring, where the radials are not only separate from the inter-radials, but are 

 distinguished from them by the fact that their anterior ends are bifid and 

 truncate, whilst those of the inter-radials are single and pointed. A median 

 cleft runs up nearly to the anterior extremity of each radial. These clefts 

 almost divide the whole ring into five separate but compound segments. 

 Posteriorly each cleft runs down to the extremity of one of the five posterior 

 prolongations of the ring, wdiich, in the former paper by one of us, have been 

 described as formed by the union of processes of the inter-radials. We can 

 no longer maintain this interpretation, for the processes in question are 

 undoubtedly radial in position, and would therefore be prolongations of the 

 radials. The structure of the ring in PI lyllopl torus dearmatvs, sp. n. (PI. 11. 

 fig. 8) supports this view. 



The water-vascular ring surrounds the oesophagus in contact with the ends 

 of the posterior prolongations of the calcareous ring. There is a single long, 

 thin Polian vesicle placed ventrally ; opposite to this is a long, thin madreporic 

 canal ending in a small madreporite. 



The alimentary canal resembles that of other species of the genus (e. g. 

 Phyllophorus dearmatus, sp. n., described below). 



The gonads are very feebly developed in the smaller specimen and are not 

 well developed even in the larger one. 



The spicules are perforated plates, each usually bearing a spine on its outer 

 face. This spine is made up' of two rods, which unite shortly above their 

 origin (PI. 13. fig. 18 6?). The plates are rather irregular in shape, but ai'e 

 frequently extended into four radiating arms, as already figured by one of us 

 {loG. cit.). The dimensions of an average-sized spicule are : — leng-th 0"35 mm., 

 breadth 0*21 mm., height of spire 0"22 mm. ; but these dimensions are very 

 variable. The spines are very frequently broken off, especially in the older 

 animals. The development of these plates is shown in PI. 13. figs. 18 a-iS c, 

 and needs no fuller explanation. In a few of the plates spines are not 

 developed at all. 



We feel fully justified in including P. anatinvs, Pemy Perrier, under the 



* Dendy, "The Holothurian.s of New Zealand," .Journ. Linn. Soc, Zool. vol. xxvi. fig. 66. 



