202 PROCEEDINGS OF THE ACADEMY OF [March, 



Chlorostoma argyrostomum var, basiliratum n. 



Shell imperforate, smaller than the typical form, \Tith coarser 

 corrugation above, the base strongly Urate concentrically. 



Hirado, Hizen (Mr. Y. Hirase). 



This form is intei'mediate between the finely corrugated Chinese 

 argyrostomum and the coarsely sculptured Japanese species of 

 Chlorostomi. I know of no authentic record of C. argyrostomum 

 from Japan. 



ACM^ID^. 

 Acmaea Heroldi var. signata uov. 



About the size and form of A, Heroldi. Nearly smooth or with 

 very low, weak radial ribs; white, with eight gray rays variegated 

 with brown. Interior white or brownish within the muscle-scar, 

 the edge dotted and maculate with brown. 



Length 13, breadth 10, alt. 4 mm. 



Otoshima, prov. Bitcliu (Mr. Y. Hirase). 



A form from Kamakura, taken by Mr. F. Stearns, seems refer- 

 able to this variety. It is smaller and higher, length 9.5, breadth 

 7.5, alt. 4 mm., without a marked internal margin or central area, 

 the rays showing through. 



It may be well to say in this connection that the Patella jyallida 

 of Gould, formerly referred by me to Helcioniscus, is a true 

 Acmcea in shell characters. Mr. Hirase has sent specimens from 

 Mashike, Teshio, in Hokkaido. 



Patella grata Gould has '* about the contour of Helcion'iscus 

 eucosmius Pils. , is quite acutely conic, with strongly spinose ribs," 

 according to a note I made on the type. No, 1,965, U. S. Na- 

 tional Museum. 



PATELLID^. 

 Patella luchuana n. sp. 



Shell small, solid, rounded-oval, conic, the altitude nearly half 

 the breadth; apex erect and acute, situated a little in front of the 

 centre; anterior and posterior slopes somewhat convex. Surface 

 dull, sculptured with many narrow riblets, several inconspicuous 

 radial threads in each interval. Greenish gray, indistinctly 

 speckled with dark brown. Interior bluish or livid white, the 

 area within the muscle-impression large, calloused, the impression 



