108 JAPANESE MOLLUSKS, FISSURELLIDii:. 



Macroschisma dilatata A. Adams. Sowerbv, Thes., Ill, ]>, 206, f. 220 ; Man. Conch, 

 xii, ji. Ill;;, pi. ,')it, f. n.j. 



Nemoto, Boshiu (Stearns). 



The specimen referred to this species diff'ers from M. sinensis in 

 being shorter and broader, with shorter foramen and concave front 

 slope. Color red, with a white ray on each side. 

 Macroschisma Lischkei Pilsbry. PI. YT, figs. 1, 2, .3, 4, 5. 



Nemoto, Boshiu (Stearns). 



Shell oblong, the length less than twice the breadth ; lateral mar- 

 gins convex, anterior margin well rounded, posterior margin bluntly 

 rounded, subtruncate. Anterior slope straight, decidedly less than 

 half the length of the shell ; side slopes straight. 



Surface sculptured with fine radial strife, alternately larger and 

 smaller, finer on the forward half of the side slopes ; slightly decus- 

 sated by growth lines. Color either (1) uniform black, or (2) 

 ■closely speckled with black on a buff ground, or (3) crimson with 

 or without dusky rays. Posterior slope long for the genus, about 

 one-fifth the length of the entire shell ; flattened or subconcave be- 

 hind the hole, but not guttered. Perforation large, oblong, slightly 

 narrower in front, and wider behind, with a very narrow eroded tract 

 behind it. Length of hole contained two and one- half times in length 

 of shell. Interior bluish-white, the hole-callus darker at the sides. 

 When resting upon a plane surface, the peristome of the shell is 

 seen to be very much elevated behind, and but little less so in front; 

 the latero-basal margins strongly curved throughout. 



Length 17t, breadth 9, alt. 5 mm. 



Length 16, breadth 9], alt. 5 mm. 



Twenty-two specimens collected. This seems a very distinct spe- 

 cies ; the position and proportions of hole, the long posterior and 

 short anterior slope, and the strongly curved basal margins being 

 especially characteristic, and unlike other described forms. 



EmarginulincB. 



rissuridea ticaonica Reeve. Sowb.. Thes., Conch., Ill, p. 197, f. 110. 



Described from Ticao, Philippines ; reported from Japan by 

 Dunker. One specimen collected by ^Ir. Stearns is referable to this 

 species, although the foramen is rather shorter. 



Fissuridea was proposed for a highly arched species from the Philippine 

 Is. It has hitherto been regarded as a subgenus of Fissvrella. Its synonymy 

 is as follows : 



