REPORT ON THE LAMELLIBRANCHIATA. 167 



Verticordia deshayesiana, Fischer. 



Verticordia deshayesiana, Fischer, Jouru. de Conch., 1802, vol. x. p. .3.'), pi. v. figs. 10, 11. 

 Verticordia japonica, A. Adams, Ann. and Mag. Nat. Hist., 1862, ser. 3, vol. ix. p. 2M. 



Habitat. — Station 122, oft" Pernambuco, in 350 fathoms; also Station 185, east of 

 Cape York, North Australia, in 155 fathoms. 



A single valve from each of the above localities is all that was obtained of this species. 

 They are of the same convex character as the shells described by Fischer and Adams, and 

 not so compressed as Verticordia cardiiformis from the Crag, which is considered 

 identical byJefi"reys. I have never seen a specimen of Philippi's Verticordia acuti- 

 costata, but, judging from his description and figure alone, I am not convinced that it is 

 the same species as Verticordia deshayesiana. His description and figure of the costse 

 do not accord with the species before me. 



Verticordia australiensis, n. sp. (PI. XXV. figs. 6-66). 



Testa tenuissima, parva, late cordata, insequilateralis, alba, tenuiter radiatim lirata, 

 liris parum elevatis, minutissime granulata. Margo dorsi posticus leviter arcuatus, 

 obliquus, anticus infra umbones excavatus. Ventris margo in medio acute rotundatus, 

 utrinque valde adscendens. Umbones prominentes, ad apicem aliquanto obtusi, modice 

 ante medium siti. 



This species is small, very fragile, white, rather inequilateral, broadly heart-shaped, 

 longer than high, and moderately convex, and exhibits a very faint depression at the 

 posterior end from the beaks to the ventral margin. It is, as seen under the microscope, 

 everywhere minutely granular, and ornamented with fine, very slightly raised, radiating 

 lirse, which are about twenty-four in number and subequidistant. The dorsal margin is 

 oblique on both sides, longer posteriorly than in front, and a little excurved, being 

 decidedly excavated anteriorly beneath the beaks. These are fairly prominent, rather 

 large at the apex, curved towai'ds the front, and situated decidedly in advance of the 

 centre. Both ends of the shell are narrowed, especially the anterior, and sharply 

 rounded as is the lower outline at the middle, which is much ascending on both sides. 

 The interior is glossy and the muscular scars and the pallial line not discoverable. The 

 hinge is composed of a single tubercular tooth in the right valve immediately beneath 

 the umbo, which fits into a corresponding break in the hinge-line in the left valve, behind 

 which there is an indistinct tooth. The posterior dorsal margin of the right is also 

 distinctly grooved for the reception of the acute edge of the left. 



