1902.] NATURAL SCIENCES OF PHILADELPHIA. 715 



Venerioardia (Cyolocardia) alaskana Ball. 



Venericardia borealis Conrad, Proc. U. S. Nat. Mus. XIII, p. 216, 

 1890, ex parte ; and PI. XVI. fig. 8. 



Bering Sea. 



Cardita (Glans) sulcosa n. sp. 



Shell small, trapezoidal, with small elevated prosogyrate beaks, 

 the lunule small and deeply impressed, escutcheon linear; from 

 the beaks a wide and shallow sulcus extends to the lower posterior 

 margin which it distinctly emarginales; sculpture of about 23 flat- 

 topped ribs with much narrower channeled interspaces ; the ribs 

 are crossed by concentric elevated ridges, thus producing annulations 

 which are more conspicuous on the sides than at the top of the ribs; 

 the coloration is of dark -brown, red -brown and white, more or less 

 articulated on the ribs ; interior white, the margins strongly crenu- 

 lated. Height 7.5, length 8.5, diameter 6.5 mm. 



The only form with which this might be confused is the young 

 of C cuvieri, which is less quadrate and has coarser sculpture and 

 fewer ribs. 



Bibliography. 



For the majority of the citations in the text, reference may be had to 

 the bibliographical list in the synopsis of the Lucinacea, Proc. U. 8. 

 Nat. Museum, XXIII, pp. 781-784, but for those especially important for 

 the Carditacea the following list is offered : 



179a. Bruguiere, Encyclopedie Methodique, I, p. 401. 



1801. Lamarck, Systeme des Animaux sans Vert^bres, p. 123. 



1807. Link, Beschreibung der Rostock Sammlung, p. 153. 



1824. Blainville, Dictionnaire des Sciences Naturelles, XXXII, p. 



326. 

 1832. Broderip, Proceedings of the Zoological Society of London, pp. 



55-56. 

 1882. Sowerby, Proceedings of the Zoological Society of London, pp. 



194-195. 



1838. Conrad, Fossils of the Medial Tertiary, p. 11. 



1839. Anton, Verzeichniss der Conchyliensammlung, p. 10. 



1839. Gray, Zoology of Beechey's Voyage to the Pacific, Mollusca, p. 



152. 



1840. Gray, Synopsis of the Contents of the British Museum. 



1841. Conrad, American Journal of Science, XLI, p. 347. 

 1843. Reeve, Conchologica Iconica, I, Monograph of Cardita. 

 1845. Conrad, Fossils of the Medial Tertiary, p. 74. 



1847. Gray, Proceedings of the Zoological Society of London, p. 194. 



1852. Deshayes, Proceedings of the Zoological Society of London, pp. 



100-103. 



1853. MoRCH, Catalogus Conchyliorum .... comes de Yoldi, II, pp. 



37-8. 



1854. Gray, Annals and Magazine of Natural History, XIV, p. 22. 

 1857. H. and a. Adams, Genera of Recent Mollusca, II, pp. 486-488 



