SMITH : ON THE GENUS ASTARTE. 23 T 



Dall, are closely allied and indeed may prove to be identical on 

 comparison. 



24.— ASTARTE ESQUIMALTI Baird. 



1863. Crassatella esquimaiti Baird. Proc. Zool. Soc, p. 70. 



1864. Astarte esquimaiti Carpenter. Suppl. Rep. Moll. 



W. N. Amer., p. 642. 

 1872. Crassatella esquimaiti Tryon. Proc. Acad. Nat. Sci. 

 Philad., p. 250. 



Habitat.^ — Esquimaiti Harbour, Vancouver Is. (J. K. Lord). 



The single shell described by Dr. Baird as a Crassatella is 

 without doubt a species of Astarte, for its dentition and external 

 ligament are in conformity with that genus. It is possibly only a 

 young specimen, but the peculiar undulation of the concentric 

 ribs (the feature of the subgenus Ridocyvia) especially near the 

 beaks, marks its specific distinctness. The inner edge of the 

 valves is smooth, but it is quite likely that in the mature shell it 

 may be crenulated. 



25.— ASTARTE FLUCTUATA Carpenter. 



1864. ?A. fluctuata Cpr. Suppl. Rep. Moll. W. coast N. 



Amer., pp. 611 and 642. 

 t866. a. fluctuata Cpr. Proc. Calif Acad. Nat. Sci., vol. 



iii., p. 209. 

 1870. A. fluctuata Cpr. Moll. West. NorthAmer.,pp. 97 & 128. 

 1872. A. fluctuata Tryon. Proc. Acad. Nat. Sci. Philad., 



p. 246. 



Habitat. — Catalina Island, California, 30 — 40 fathoms. 



This species was described from " dead right valves," and 

 judging from the description it appears to be less triangular than 

 A. esquimaiti. 



