UN... in;. 



I. \i 1:1 OTINCT1 - < 'arpeiiler, n. |p, ( 'nj 



Shell resemblili (f, but the lateral AfMI 



Scarcely defined, radial and Ion-it udina! 

 Kntire surface equally granulated. < )ran-e .-potted \vitli 

 Interior: posterior valve having 11, central \alv<- I, anterior 

 l.'J.-lits. Len-th ;.. breadth \ mill.; diver-ence IIHI . r //r .) 



( ''ilnlinn, Ixluiitl, ( 'nl. 



Thl8 Species is known from Tr.jln.rti* by the valvis not beini: 

 beaked, and by the large striated scales of the margin, which 



nilile tho>e of /. scabricottatut. (Cpr.) 

 I. DECIPIENS Carpenter, n. sp. t'njnjured. 



Shell exactly like /. /irrfinii/'ifii*, hut reddish, rK-vatod, the JIILMIID 

 acute ; scales of the girdle small, striated. 



Length 15, breadth 7-j mill.; divergence 105. (Cj>r.') 



This very pu//lin,ir shell differs from /. *!nn(lriit<itii. in it- normal 

 sinus and smaller scale- ; I cannot help suspecting that \\lnn moi'e 

 specimens have been examined, it will be found that some chara-ier-. 

 generally constant between species and even groups, are occasionally 

 variable in the same speeies. 



I. CORIM <; \ it s Carpenter, n. sp. Unfigured. 



Shell similar to Ch. sanguineus in form and varied coloring ; 

 entire surface granulose; central areas having impres>ed punctate 

 wrinkles, hardly lirate ; lateral areas strongly longitudinally corru- 

 gated. Interior: posterior valve with 8-10, anterior valve i 

 central valves 1 slit. Sinus wide, flat. Girdle thin, covered with 

 very close, very small striatulate imbricating scales. 



Length 13:], breadth 7 mill.; divergence 90-100. 



( 'otalina Is., beach to 40 fms. (Cooper, Cal. State Coll. No>. 1 

 1070,1074); Todos Santos Bay (Hemphill), California. 



Differs from Stenoplax samjuine.ii* in sculpture as well as in the 

 plan of mantle-ornamentation. A specimen from Todo- Santo- 

 Uay (under a stone between tides) collected by Henry Hemphill, is 

 about the size of limactfornil* from Ma/atlan, and it would natur- 

 ally be so called; the sculpture, however. i> > -n-ibly ditfi-rent, both 

 from that and from /'<///</.>. The central areas are minutely, the 

 juir;d areas very minutely, wrinkle-punctate, wrinkle- an-jular. 

 irregular; lateral areas moderately dcfineil and el and, 



