6 JAPANESE MOLLU8KS, PULMONATA. 



black, the larger ribs indicated by white rays ; siphon occupying a sin- 

 gle rib t never a double one. Cavity with a white callus (rarely 

 chestnut colored), the region of the muscle impression bordered 

 with chestnut stains. Length 22, breadth 1 7-19, alt. 5 mm. 



Sagami, and Kashiwazaki, Boshiu, Japan (Frederick Stearns !). 



This species differs from S. atra Q. & G., coreensis A. & R., and 

 their allies in having the siphonal rib single and simple. It is prob- 

 ably the species identified as S. atra by Dunker and other writers 

 on Japanese shells. Several hundred specimens collected by Mr. 

 Stearns agree in the characters above given. Not one shows any 

 tendency to double the siphonal rib. 



Siphonaria cochleariformis Reeve. Conch. Icon., pi. 6, figs. 28 a, b. 



Koshinozaki, Boshiu (Stearns) ; Deshima (Dkr.); Nagasaki 

 (Lischke). The specimens agree well with Reeve's figures, except 

 that the entire interior is black-brown except for a narrow white 

 border closely marked with dark at each rib interval. 



Siphonaria acmaeoides Pilsbry. PI. VI, figs. 19, 20, 21, 22. 



Shell oblong, nearly equilateral, but with excentric apex like S. 

 radiata A. & R. (Zool. Samarang, pi. 13, fig. 2). The even surface 

 hardly modified by the 9-16 low, wide ribs, between which it is very 

 finely radially striated. Siphonal rib wide but low and inconspicu- 

 ous. Apex spiral, bent down and appressed. Interior blackish or 

 chestnut within the muscle impression, outside of which it is radially 

 striped black and white, the siphonal channel extremely shallow 

 and inconspicuous. Color outside whitish-buff, speckled and mac- 

 ulated with brown, or whitish on the principal ribs, the intervals 

 black-brown. Length 12|, breadth 9i, alt. 3 mm. 



Prov. Boshiu, Japan (Frederick Stearns). 



This little species very closely resembles Acmcea Heroldi in the 

 general form and the coloration of the interior. 



OPISTHOBRANCHIATA. 



ACTJEONIDJE. 

 Solidula strigosa Gld. J. M. C., II, pi. 5, f. 12, 13. 



Loo Choo and Kagoshima (Stimp.) ; Nagasaki (Birileff) ; Tokyo 

 Harbor (Stearns) ; Gozo Harbor, 6 fms. (St. John). 

 Solidula fratercula Dkr. Index, p. 161, pi. 13, f. 21-23. 

 Japan (Dkr.). 



