354 
vol. ix., 1886, p. 100, and listed by Adcock in his Handlist, . 
1893, No. 146. Mr. Hedley has sent me Smith’s species, ob- 
tained from the type locality, and it appears to have less 
curved dorsal borders and fewer ribs, which are scaled, and 
not corded. 
It very closely resembles C. elegantula, Tate and May, 
of which it may prove to be only a variety, in which case its 
name will indicate the difference, for it has fewer and higher 
ribs, with bolder and less crowded concentric cords, and is 
somewhat less oblique. 
Type in Dr. Verco’s collection. 
Carditella vincentensis, n. sp. Pl. xvi., f. 20, 21. 
Shell solid, roundly trigonal. Umbos projecting, ap- 
proximate, curved forward. Dorsal borders converge at about 
a right angle; posterior straightly convex, anterior slightly 
excavate. Lunule elongate-cordate, depressed, smooth, its 
centre prominent, and seen as a convexity in the profile of 
the shell. Escutcheon well marked, elongate, bevelled edges, 
left valve overlapping the right. Twenty-two flattened 
rounded ribs, the posterior straight, the anterior concave for- 
wards, interstices linear. Well-marked concentric lire cross 
the ribs and spaces. Right valve has a central triangular 
cardinal tooth, a long anterior lateral tooth separated from 
the margin by a groove, and a thin posterior marginal lateral. 
The left valve has two diverging cardinal teeth, a posterior 
lateral separated from the margin by a groove, and an an- 
terior marginal lateral tooth. The lateral teeth and sockets 
are microscopically vertically striate. | Ventral border well 
denticulated internally. Colour white, reddish-brown tint 
on the posterior third of the shell, deepest at the posterior 
inferior angle. 
Dim.—Antero-posterior diameter, 3 mm.; umbo-ventral, 
2°85 mm. 
Hab.—Gulf St. Vincent, Spencer Gulf, and Backstairs 
Passage, 20 and 22 fathoms, several alive and many valves. 
Variations.—The posterior dorsal border may be quite 
straight. The colour may be wholly white, the brown tint 
may be continued across the middle to the front border, 
or 1t may he disposed in radially elongate spots on the ribs. 
Diagnosis.—From C. elegantula by its straighter posterior 
border, by the prominence of the centre of its lunule, by 
being more equilateral, and by its colour. 
Type in Dr. Verco’s collection. 
Cuna atkinsoni, Tenison-Woods, sp. 
Kellia atkinsoni, Tenison-Woods, Proc. Roy. Soc., Tasm., 
1877 (1876), p. 158. Type locality.—Long Bay, Tasmania. 
