46 PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



Since that date it has been generally accepted that Onithochiton was 

 introduced for Ch. undulatuH, Quoy & Gairaard. Two points are 

 noticeable ; throughout the ])aper quoted Gray constantly referred to 

 Quoy & Gairaard, and always noted them as authors save in tliis 

 case; also Quoy & Gaiiuanl described their sliell from New Zealand, 

 and it is not known from Tasmania, though Gray recorded it as 

 collected there, and, at the time Gray wrote, four species had been 

 proposed bearing the name Ch. tmdulatus, and it is impossible at this 

 time to know which one Gray intended. To retain the generic 

 Onithochiton in the sense now used, we must make use of the argument 

 that Ch. gaimardi and Ch. hirtosus, Blainville, were species unknown 

 to Gray, save from literature, whereas apparently he had a specimen 

 of Ch. undulatufi before him as he notes a locality, " Van Diemen's 

 Land." When H. & A. Adams prepared the Genera of Recent 

 IloUusca they restricted Onithochiton to the Ch. imdulatus, Quoy 

 and Gaimard, group, and rejected from it Ch. gaimardi and 

 Ch. hirtosus, Blainville. 



In the Proc. Malac. Soc, vol. ix, pp. 153-4, 1910, I made some 

 comments on New Zealand Onithochitons, and, accepting Pilsbry's 

 dictum regarding preoccupied names, which is now known to be in- 

 correct, I admitted Quoy & Gaimard's specific name undulatus for the 

 common species. As, however, that name is preoccupied, the common 

 New Zealand Ofiithochiton must be now known as Onithochiton 

 filholi, Kochebrune. The synonymy and species will remain as given 

 in my paper quoted. 



ONiTHOcnrroN oliveri, n.sp. 1*1. II, Fig. 11. 



Shell of medium size, rather broadly oval, slightly keeled, girdle 

 densely spicnlose. Coloration variable; dark green with lighter 

 marblings being normal; one small shell is dark chocolate varied with 

 cream and pink, whilst another is bright vermilion with cream 

 markings. The whole shell is absolutely smooth and glossy, a few 

 growth-lines onl)^ showing, the lateral areas of the median valves 

 being indicated by a slight elevation. On the anterior valve twenty 

 to twenty-five irregular radiating rows of eyes, about ten eyes to a row, 

 can be counted. On the latei'al areas one row, often doubled and 

 trebled, can be noted. Inside coloration pinkish-white; the anterior 

 valve with two reddish-brown marks on posterior edge ; the first 

 median valve with a large red-brown blotch similarly placed, which 

 is more or less extensive on the succeeding valves, but absent from 

 the posterior valve. Anterior valve with projecting plate regularly 

 eight-slit, the teeth beautifully pectinate. Median valves with large 

 sutural laminae, higher near the sinus, which is cleanly denticulate. 

 Insertion-plate one-slit and pectinate. Posterior valve with the 

 insertion-plate reduced to a callus, beyond which the tegmentum 

 extends. Girdle covered with long sharp-pointed, glassy spikes. 

 Length of type 24, breadth 15 mm. 



Hab. — Sunday Island, Kermadec Group. 



Station. — Living in crevices of rocks between tide-marks. 



