376 MR. G. S. BRADY ON NEW OR IMPERFECTLY 
occasionally fringed with hairs; posterior margin rounded, bearing four or five short 
processes or tubercles on its inferior portion. Dorsal margin arched, irregularly 
sinuous, highest at its anterior third. Inferior margin nearly straight, with a slight 
median convexity. Dorsal aspect compressed, angular, oblong-ovate. End view sub- 
quadrangular, compressed, about once and a half as long as broad. Surface of the 
valves marked with several conspicuous ridges, one of which runs longitudinally along 
the ventral margin, another in a curve parallel with the anterior border, and two or 
three more in an oblique direction from the ventral ridge towards the dorsum. Between 
the primary ribs the shell is marked with large subquadrate pits or reticulations. 
Length 5 in. (1:05 mm.). 
Hab. Hunde Islands, 60-70 fathoms (Dr. Sutherland). 
Cythere neptuni (Egger) seems to be the nearest described relative of this fine species. 
12. Cyruere cxiaTHrata, Reuss. (Pl. LIX. fig. 9, a-c; fig. 10, a-c; fig. 11, a-d; 
fig. 12, a-c; fig. 13, a—c.) 
Cypridina clathrata, Reuss (1849), Haidinger’s Abhandl. iii. p. 71, t. 9. fig. 31. 
Cythere lyrata, Reuss, Beitrage zur Charak. der Tertiiir-Schicht. des nérdl. u. mittl. Deutschlands, 
p- 62, t. 10. fig. 99. Speyer, Ostrac. der Casseler-Tertiarbild. p. 25, t. 3. f. 4. 
Cythere latimarginata, Speyer, Ostrac. der Casseler-Tertiarbild. p. 22, t. 3. fig. 3. 
Carapace oblong, subquadrilateral, somewhat ear-shaped, broadest in front. There is 
a conspicuous rounded tubercle a little in front of the centre of the valve, and two large 
elongated eminences considerably behind the centre, which coalesce so as to form a 
much elevated transverse ridge. ‘his ridge is continued forwards more or less dis- 
tinctly along the ventral margin. The anterior margin of the carapace is obliquely 
rounded and armed, in the adult, with a series of equal rounded teeth, varying from 
about fifteen to thirty in number. Posterior margin narrow, rounded, and produced at 
its inferior angle, where it bears a few (mostly five or six) teeth. Ventral margin 
straight or slightly convex. Dorsal margin straight, often corrugated, and sloping 
backwards from the anterior binge. Dorsal aspect oblong, angularly ovate or subqua- 
drilateral. Surface (in the adult) marked with closely set and tolerably large pittings or 
reticulations. 
Length 3)5—y'5 in. 
Hab. Hunde Islands (vars. nuda, latimarginata, lyrata). Norway (C. clathrata, and 
vars. nuda, lattmarginata). 
The number of species which I have thought it necessary to include under the 
specific designation of ‘‘ clathrata”’ might, I believe, be fairly increased by the addition 
of two more species, Cythere hexangulatopora, Speyer, and C. bornemanni, Speyer. The 
characters upon which these and the previously quoted species rest appear to depend 
partly upon local variation, but chiefly upon the age of the specimen. I have arrived 
at this conclusion from the careful examination of a large number of specimens of all 
