BVOOHFP 1 -J I 



1. i; \ 1. 1 \ N~ < 'arpenler, n. sp. 



Shell r;itlirr large, \\ide, elevatrd, tin- JULMIIII ftCUte ; "li 

 elegantly radially streaked with brown. Interior ||, <.\Jth 



two In-own rays. Valves delicate, Hat, product d in the -inn- in 

 front : mucro in front <>f the middle, .-eareely elevated ; entiiv >ur- 



face quincuncially granulated ; lateral areas scarcely defined. ;u,d 



with the end valves ohsoletely sublirulate. Interior: pi,.-t- 

 valve having JMO, central valves 1, anterior valve ID 11 slits; 

 teeth acute; eaves small; >imis wide, short, scarcely laminate. 

 Girdle regularly covered with solid, coarsely striated, moderate sized 

 scales. Length L'l, breadth If) mill.; divergence 110. (( ', 



Monterey, Cnlijoniin. 



The internal color-rays are seen in all the dead valves; the 

 external painting resembles Mo/xtl'm vespertina. The sculpture is 

 on the plan of/, mterstinctus. One central valve of one specimen, 

 on one side only, had a second slit. (Q>r.) 



8. Group of I. scabricostatus, 

 I. SCABRICOSTATUS Carpenter. Unfigured. 



Shell small, orange colored, elevated ; valves gothic arched, jugum 

 acute. Entire surface very closely granulated ; lateral areas well 

 defined, with 3 subobsolete, radiating series of large granule.- : 

 beaks scarcely apparent; umbonal margin slightly turned inward, 

 and having dark spots giving a false appearance of teeth. Central 

 areas having separated longitudinal series of narrow, subobsolete 

 riblcts, furnished with large granules. End valves having similar 

 radia'inir granulous riblets. Umbo of posterior valve scarcely cen- 

 tral, little projecting. Interior: sutural plates separated by a large 

 flat sinus; insertion plates subobtuse, the end valves having 1"-1_, 

 central valves 1 slit; eaves moderate, subconspicuous. (Jirdle 

 wide, closely clothed with imbricating, elongated, transvei> 1\ 

 striated scales. Length 73, breadth 41 mill.; divergence 1 



(Cpr.} 



Catalina Islan<I, California, in lO-'Jo fms. 



Le]iu1n/>f''ii,'n* anibr'icttxtuhi* Ci-i:., Hep. Brit. A.so. Adv. 8 

 isi;:;, p. 649; IVoc.Cal. Acad. N. S. ii, p. -iVl.Mm,,- iW- 



costatu* ( 'i'ii., J/& 



The sinus has a thin, smooth lamina separated by a slit on each 

 side from the sutural lamime. It is a small, arched oraii-. 



with rows of prominent granules over a shagreened surface, ' 



