HOLOTHFEIANS OF NEW ZEA.LAKD. 41 



knobbed reticulate plates or buttons (PI. 5. figs. 54-57), distin- 

 guisbedfrom tbose of (7. calcarea by their somewhat larger sizeand 

 less regular shape, measuring about 0*09 mm. in longer diameter. 

 The characteristic reticulate cups of the genus are represented 

 by small perforated plates beset with minute knobs. Some of 

 these are closely similar to the cups of G. calcarea ; some are 

 almost, if not quite, flat and of irregular shape (PI. 5.figs. 58-60) ; 

 they are very numerous and vary a good deal in size. In the 

 integument of the dorsal surface large reticulate nodules are 

 also abundant ; these are of rounded or oval form, and up to 

 0'5 mm. in longer diameter. Curved perforated rods (PL 5. 

 fig. 61) and reticulate end-plates also occur. 



Thus the spiculation makes a near approach, to that of my 

 ColucMrus calcarea, but differs especially in the presence of the 

 large nodules. 



The arrangement of the ambulacral appendages and the spicu- 

 lation leave no doubt in my mind that the species is really a 

 Colochirus. The shortness of the " teeth," referred to by Hutton, 

 and the unequal length of the tentacles also favour this Tiew. 

 It seems to be nearly related to C. calcarea, but diS'ers from 

 that species in its much larger size, in the much more numerous 

 and more prominent papillae, and in the spiculation as already 

 pointed out. 



PSOLTJS MACQUAEIEIfSIS, n. sp. (PI. 7. figs. 70-72.) 

 Body in spirit slug-like, somewhat flattened ventrally to form 

 a creeping sole, which extends from end to end and is not sharply 

 defined. Broadly rounded in front and behind, about -2- inch 

 long and \ inch broad in the middle. Integument soft and 

 smooth, but corrugated, chiefly transversely. Mouth anterior ; 

 anus at posterior end but slightly dorsal. There are three 

 sharply defined ventral ambulacra, each with two or three rows 

 of irregularly alternating tube-feet, possibly forming a single 

 series when the body is extended. The remainder of the integu- 

 ment is quite devoid of ambulacral appendages. Tentacles ten, 

 bushily branched and of about equal size. 



Pharynx subglobular, thin-walled, swollen out with the 

 indrawn tentacles. No complete calcareous ring, the pharyngeal 

 skeleton being reduced to a few white patches composed of 

 aggregations of granules. The retractor muscles, however, are 

 well developed. (Esophagus short, marked ofi" by a sharp 



