Hurron.—On the New Zealand Siphonariide. 141 
growth-lines; suture impressed : umbilicus very narrow, but open: aper- 
ture, peristome, operculum and dentition like the last species. Height 0:18, 
diameter 0:08 inch. 
Hab. Greymouth, with the last species (Mr. R. Helms). 
More acute than the last and not carinated, but perhaps only a variety. 
Art. IX.—On the New Zealand Siphonariide. By Professor F. W. Hvrrox. 
[Read before the Philosophical Institute of Canterbury, 1st June, 1882.] 
Plate XVII. 
In this paper I have attempted to give descriptions of the shells and denti- 
tion and some notes on the anatomy of all the New Zealand species of 
Siphonaria and Gadinia known to me, that is four species of Siphonaria 
and one of Gadinia : it will I hope form a basis for a comparison with the 
species inhabiting Tasmania, Australia, and Polynesia. 
enus Siphonaria, Blainville. 
Shell conical, with an internal siphonal groove on the right side. Head 
with a frontal bilobed dise ; eyes none ; pulmonary cavity with a gill lying 
transversely across the middle ; respiratory orifice covered by a fold of the 
mantle. Jaw horny. Radula long, the teeth quadrate, arranged in very 
slightly curved transverse rows. 
Ova in white gelatinous rope-like masses from an inch to an inch-and- 
a-half in length, attached to rocks ‘in semicircles or irregular curves. 
Larva a veliger in a nautiloid operculated shell. 
Ova laid early in February.* 
SiemowaRrA opLrQUATA. Plate XVIL., figs. A to D. 
Siphonaria obliquata, Sowerby, Cat. Coll. Earl of Tankerville, 1825, app. p. 7. 
Reeve, Conch., Icon., fig. 56. 
Siphonaria scutellum, Deshayes in Guerin’s Magasin de Zoologie, 1841, pl. 35. 
Shell large, oblong, rather depressed, with numerous rather undulating 
ribs ; apex posterior, uncinate. Exterior brown ; interior liver-brown, often 
mottled with yellowish-brown. Length 1:6, breadth 1, height *5 inch. 
Dentition, 81, Jaw arcuate, expanded at each end, with about 
five rounded transverse ribs in centre ; anterior margin papillate, the rest 
smooth. Central tooth broad, the breadth being more than half the length; 
laterals 90 with a unidentate cutting-point on the principal cusp, and a 
small cutting-point on the outer side which is placed on a small cusp on 
the more central laterals ; marginals nearly square with three cutting- 
points, the median one large and rounded at the end. 
* The following species are omitted as not really inhabiting New Zealand :— 
S. cancer, Reeve; inhabits Formosa. S. spinosa, Reeve ; habitat unknown, 
