228 Mr. A, Adams on new Species of Acephalous Mollusca 
Genus Lepton, Turton. 
Lepton japonicum, A. Adams. 
L. testa orbiculari subsequilaterali, compressa, tenui, sordide alba, 
superficie conceutrice 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 GALEoMnNrIA, Turton. 
Galeomnia japonica, A. Adams. 
G. testa tenui, transversim ovata, subeequilaterali, 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 CRENELLA, 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-marginali instructo ; latere antico rotundato, 
postico subangulato; superficie lineis incrementi concentrice im- 
pressa. 
Hab. Mino-Sima; 63 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 lines; 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 lengiore rotundato, 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, Mont. ; the radiating red- 
brown bands are narrow at the beak, and gradually widen as 
they approach the ventral margin. 
