228 Mr. A. Adams on new Species of Acephalous Mollusca 
Genus Lrerron, Turton. 
Lepton japonicum, A. Adams. 
L. testa orbiculari subsequilaterali, compressa, tenui, sordide alba, 
superficie concentrice striata, area antica obtusim subangulata, 
utrinque rotundata; margine ventrali regulariter arcuato. 
Hab. Tabu-Sima; 25 fathoms. 
The surface of the valves is concentrically striated, and not 
shagreened as in some species. 
Genus GALEomNIA, Turton. 
Galeomnia japonica, A. Adams. 
G. testa tenul, transversim ovata, subzequilaterali, alba, radiatim tota 
striata striis elevatis confertis, concentrice substriata striis con- 
centricis irregularibus, umbonibus medianis acutis ; margine ven- 
trali arcuato. 
Hab. Mino-Sima; 63 fathoms. 
The ventral margin is but very slightly gaping, and the sur- 
face of the valves is radiately striated. 
Genus Crene.Lia, Brown. 
1. Crenella spectabilis, A. Adams. 
C. testa oblongo-orbiculari, tumida, alba, tenui, striis elevatis con- 
fertis radiantibus tota striata ; margine cardinali antice crenulato, 
postice lamella infra-m arginali instrncto'; latere antico rotundato, 
pestico subangulato; superficie lineis incrementi concentrice im- 
pressa. 
Hab. Mino-Sima; 68 fathoms. 
This, I suspect, is the largest species hitherto described. It is 
a delicate, thin, white shell, entirely striated from the beak in a 
radiating manner, with fine elevated lmes; its greatest diameter 
is from the beak to the ventral margin. 
2. Crenella decorata, A. Adams. 
C. testa transversim oblonga, tumida, obliqua, latere antico breviore, 
postico longiore maunilato, striis radiantibus et concentricis de- 
cussata, Jutescente, fasciis rufo-fuscis radiatim picta ; margine ven- 
trali crenulato. 
Hab. Port Hamilton ; 7 fathoms. 
This is a prettily marked, transversely oblong, tumid species, 
considerably larger than C. decussata, Mcnt.; the radiating red- 
brown bands are narrow at the beak, and gradually widen as 
they approach the ventral margin. 
