1 G2 Transactions. — Zoology. 



Patula celinde, Gray. PJ. ix., fig. o, and pi. xi., fig. u. 



Jaw slightly arcuate, with flat ribs ; very delicate. 



Dentition, 18-1-18. Laterals about 5. 



Central tooth rectangular, as broad as long; the reflexed portion tri- 

 cuspid, extending over half the base, with a large, clavate, median cusp 

 extending quite to the posterior margin, and with a rather large cutting 

 point. Laterals like the central tooth. Inner marginals with an oblique 

 reflexed portion carrying a long point at the end, the outer side indented 

 and with a minute point. Outer marginals broader than long, with two 

 points ; at first the inner point is much the larger, but near the outer edge 

 both points get equal. 



Hab. Auckland (T. F. Cheeseman). 



The shell has distant membranaceous plaits which are produced at the 

 periphery into triangular processes. 



Patula coma, Gray. PI. ix., fig. o, and pi. xi., fig. k. 



Animal small, mantle rather posterior, the tail not produced behind the 

 shell ; eye-peduncles large, clavate, approximated at their bases ; the 

 tentacles short. Yellowish- white, eye-peduncles and a stripe down each side 

 of the head dark purple. 



Jaw finely striated, arcuated, not tapering, with a slight median 

 projection. 



Dentition, 13-1-13 ; varying from 12 to 15. Laterals 4 or 5. 



Central tooth with the base broader than, or as broad as, long ; the 

 reflexed portion slightly contracted near the attachment, and tricuspid ; the 

 median cusp with a long point reaching beyond the posterior margin of the 

 base. Lateral teeth similar to the central, but with a longer base, and a 

 shorter reflexed portion. Marginals with a tridentate cutting point, which 

 is bidentate on the penultimate and absent on the minute outer tooth. 



Hab. I have examined the radulas of seven individuals — five sent by 

 Mr. Cheeseman from Auckland, and two by Mr. Helms from Greymouth. 

 The living animal was sent by Mr. Helms. 



In the shell the interstices between the ribs are finely striated with 

 growth-lines. 



Patut.a lucetta, Hutton {—coma, Pfeiffer, not of Gray). PI. xi., fig. a. 



Animal like P. coma, but white ; the peduncles purplish, and a band on 

 each side of the head slightly speckled with purple. 



Jaw smooth, membranous, slightly tapering to each end. 



Dentition, 14-1-14. Laterals 6. 



Central tooth rectangular, as long as broad ; the reflexed portion less 

 tban half the base, tricuspid ; the middle cusp with its point reaching to 

 the posterior margin. Laterals about 6, the inner with the side-cusps 



