NO. 2116. ANATINACEA FROM WEST VOAST OF AMERICA— BALL. 455 



species. It is probable that L. hrevifrons of Sowerby, 1834, from 

 Ecuador, is identical with L. cuneata Gray. L. malvinensis Orbigny, 

 is probably not a Lyonsia but a member of the Leptonacea. 



Subgenus ALLOGBAMMA Dall. 



Allogramma Dall, Trans. Wagner Inst., vol. 3, pt. 6, p. 1514, 1903. T)/pe. — 



Lyonsia formosa Jeffreys. 



ALLOGRAMMA AMABILIS Dall. 



Lyonsia (Allogramma) amabilis Dall, Proc. U. S. Nat. Mus., vol. 5, No. 2002, 

 p. 594, 1913. 



Distribution. — Type locality, off Santa Barbara Channel, California, 

 in 534 fathoms. Cat. No. 267171, U.S.N.M. 



Subgenus ENTODESMA Philippi. 



Entodesma Philippi, Arch. f. Naturg., 1845, vol. 1, p. 52; 1847, p. 66. Type.—E. 



chilcnse Philippi. 

 Philippina Dall, Moll. Porto Rico, Bull. U. S. Fish Com. for 1900, p. 498, 1901. 



Type. — Lyonsia beana Orbigny. 



ENTODESMA CHILENSE Philippi, 1845. 



Distribution. — ^Type locahty, Chiloe Island and north to Valparaiso, 

 ChHe. Cat. No. 73609, U.S.N.M. 



This is very close to Lyonsia injiata Conrad, the only difference I 

 can see is that in normally developed specimens the posterior part of 

 the sheU is more patulous, flatter, and less distinctly truncate in the 

 Chilean shell. However, a large series of both might lead to a differ- 

 ent conclusion. As these moUusks are nestlers, the valves are usually 

 much distorted, taking the form of their situs. E. navicula Adams 

 and Reeve, of Japan, is a very similar shell. 



ENTODESMA INFLATUM Conrad. 



Lyonsia injiata Conrad, Journ. Acad. Nat. Sci. Phila., vol. 7, p. 248, pi. 19, fig. 10, 



1837. Guayaquil. 

 Lyonsia diaphana Carpenter, Proc. Zool. Soc. London, for 1855, p. 228. Mazatlan 



(young shell). 

 Entodesma spongiophila Dall (MS.), 1866, Monterey, California. 



Distribution. — Vancouver Island to Salina Cruz, Mexico, and Guay- 

 aquil. Cat. No. 15522&, U.S.N.M. 



These shells are usually found living in sponges or the mass of 

 compound ascidians, and they differ from the rock nestlers in their 

 polished smooth surface and normal shape. 



ENTODESMA PICTUM Sowerby. 



Lyonsia picta Sowerby, Proc. Zool. Soc. London, 1834, p. 88. Type locality, 

 Muerte Island, Ecuador. 



This species is much the shape of E. beana Orbigny of the West 

 Indies, but differs by its painting of radial black lines on the corneous 

 ground of the periostracum. 



