SUTER : ON NEW ZEALANB POLTPIACOPHOEA. 297 



following large and squarish, the lowest a little smaller and oblong ; 

 posterior margin crenulate. Intermediate valves have the first longer 

 than the others, sharply angled, and slightly beaked; central areas 

 with 5 to 6 deep longitudinal furrows on each side ; lateral areas 

 raised, with an anterior and posterior broad rib beax'ing flatly raised, 

 squarish nodules which are more numerous on the posterior rib ; 

 seventh valve having a few central nodules on the lateral areas marking 

 a third rib ; sutui'es strongly and bluntly crenulated. Posterior valve 

 with two concentric rows of round nodules, representing 10 radiate 

 ribs; mucro slightly in front of the middle, small and pointed, 

 posterior slope straight. Girdle with rather large imbricating, convex, 

 and smooth scales, smaller on the inner side. Colour of valves 1, 2, 7, 8 

 ash-grey, the other valves greyish-brown with white spots along 

 the ridge ; girdle uniformly grey. Interior : anterior valve with 8, 

 intermediate valves with 1 , and posterior valve with 1 1 slits ; teeth 

 pectinate. Length 14, breadth 9 mm. ; divergence 95°. 



Hah. — Rangitoto Island, near Auckland, between tide-marks (H. S.). 



Of the New Zealand .species C. limans, Sykes, is the nearest, from 

 which, however, it is easily separated by the smooth, not sharply 

 raised tubercles, and the rounded, not pointed, and smooth scales. 

 Only one specimen was found, now in my collection. 



LoEiCA (s.str.) voLvox (Eeeve). 

 In my revision of the New Zealand Polyplacophora ' I placed the 

 above species amongst those doubtful ibr New Zealand, as there was 

 then no convincing evidence that the species really lived in New 

 Zealand waters. Two years ago an intermediate valve was dredged 

 in 25 fathoms near Channel Island, Hauraki Gulf, but I could not 

 be quite sure whether it represented L. volvox or not. Fortunately 

 some months ago Capt. J. Bollons brought me a good specimen of this 

 species, which he obtained from buoy moorings in 20 fathoms near 

 Whale Rock, Eay of Islands. It agrees with specimens in my 

 collection from South Australia and Fort Jackson, but the threads 

 on the central areas are somewhat closer together ; otherwise there is 

 no difference. The species has therefore to be added again to the 

 list of the New Zealand fauna. 



Onithochiton nodosus, n.sp. 

 Shell small, elongately ovate, shining, flesh colour, variegated with 

 white and brown, lateral areas with nodulous ribs. Anterior valve 

 with about 20 radiate nodulous riblets, crossed by four concentric 

 furrows; about 14 radiate rows of minute silvery eyes. Intermediate 

 valves slightly beaked, with the jugum sharply rounded; central 

 areas minutely punctate, with longitudinal ridges in front of the 

 lateral areas, short near the centre, but extending nearly the whole 

 length on approaching the margins ; several transverse furrows extend 

 over the central areas and jugum. Lateral areas scarcely raised, with 



Proc. Malac. Soc, vol. ii. 



