362 DR JAMES COSMO MELVIIL AND MR ROBERT STANDEN ON THE 
In all the specimens examined of our proposed variety, the ribs are but twelve in 
number; in typical C. pallida, Sm., they number fourteen to fifteen. The straight 
angular declivity on either side of the dorsal margin seems likewise more pronounced, 
the variety thereby assuming a more flabellate or quasi-triangular appearance. The 
general characters of the shells are identical. As Mr Smira aptly remarks, the 
superficial aspect of Cardita flabellum, Reeve,* proves it to be nearly allied. This is 
a native of Valparaiso, Chili. 
Cardita congelascens, sp. n. (Plate, fig. 23). 
C. testa parva, trapezoide, solidula, umbonibus prominulis, inzequilaterali, equivalvi, posticé dorsaliter 
recta, anticé breviter arcuata, deinde ventralem usque ad marginem, leniter subrotundata, superficie 
radiatim costulata, costulis inerassatis, numero ad 21, pulchré et regulariter nodulosis, nodulis imbricatulis, 
albis, nitidis pagina intus alba, valva dextra, cardinalibus dentibus duobus crassis, sinistra dente crasso, 
elongato, preditis. 
Alt. 3, diam. 4 mm. (sp. maj.). 
Hab.—Burdwood Bank, south of the Falkland Islands, at 56 fathoms. Station 346. 
Only disassociated valves occurred of a species of Cardita which seems distinct. 
We have compared it with C. modesta, velutina, antarctica, astartoides, and other 
species of the genus inhabiting these same southern waters, and find it fails exactly to 
correspond with any of them. At the same time, we doubt if any of our examples are 
adult. Still, the character of the ribs, and the ornamentation and the general contour 
of the shell, give us hope that it may be proved eventually to have been established 
on a sound basis. ‘The specific name alludes to the icy clime where it is endemic. 
Family Astartide. 
Astarte magellanica, Sm. 
Astarte magellanica, E. A. Smith, Proc. Zool. Soc. Lond., p. 41, pl. v. fig. 7 (1881). 
53 6 $5 Journ. of Coneh., iii. p. 227. 
Hab.—Burdwood Bank, south of the Falkland Islands, at 56 fathoms. Station 346. 
All disassociated valves, but some in good condition, and showing the olivaceous 
epidermis. The majority possess fewer concentric ribs than the type, but we consider 
them all referable to magellanica. The allied A. longirostra, Orb., also found in this 
region, is more pronouncedly beaked, and the ribbing is far finer. The crenulation of 
the inner margin of the valves is, as pointed out by the author of the species, another 
distinctive factor in A. magellanica. 
* Reeve, Conch. Icon., i., Cardita, pl. ix. fig. 47 (1848). 
