BY W. L. MAY. 57 



rina among a long- list of genera without giving a 

 type definition or other means of identification ; his 

 name must therefore be discarded as a nomen 

 nudum. Then Menke (Syn. Meth. Moll., 1828) in- 

 troduced Litorina with a classified list of species, 

 t'heir synonyms, and references to literature. It is 

 on Menke' s work that the genus is based. I have 

 not access to his first edition, but in the second 

 edition (1830) the genus is given on p. 44." 



LITORINA PRAETERMISSA (May), N. S., Fig. 3. 

 — Shell globosely turbinate, umbilicate ; whorls, six 

 rounded, rapidly increasing, the last very large ; 

 mouth pyriform, columella arched, flattened, and 

 expanded over a narrow but deep umbilicus, which 

 is frequently covered, and so not a constant feature. 

 The interior varies from light to dark purplish- 

 brown ; umbilical area white. Operculum sub-spiral. 

 Within the anterior end of the columella is a pale 

 band, margined by narrow dark lines. The whole 

 shell is girt with fine spiral impressed lines — about 

 12 on the penultimate — and strongly and frequently 

 very coarsely ridged by lines of growth. Ground 

 colour greenish white ; the purplish-brown colour 

 pattern varies considerably in different examples, 

 but usually consists of undulating and zigzag bands 

 more or less broken up. The apical whorls are 

 brown — lighter towards the top. Very variable in 

 size. -Dimensions of the type: — Length, 15; 

 breadth, 1 1 mill. Figure 3. It differs from L. 

 Mauritiana (Lamarck) chiefly in the globose form 

 and colour markings, which seem very constant, 

 but is connected by the impressed spirals and light 

 band in the mouth. It was listed by Tenison-Woods 

 in his census as L. undulata (Gray), and perhaps 

 comes nearest to L. cincta (Quoy and Gaim.), from 

 New Zealand. Habitat. — Widely distributed, and 

 in the same positions as L. mauritiana, but not so 

 universally present as that species. Type to be 

 placed in the Tasmanian Museum. 



SCISSURELLA ORNATA (May), N. S., Figs. 4 and 5. 

 — Shell minute, obliquely discoidal, strongly ribbed 

 and spiralled ; whorls rounded, but somewhat angled 

 by fhe canal; mouth large, roundish, oval, and a small 



