192 Panama Shells. TROCHID^T. 



centric lines: with many elevated granulous spiral lines, of 

 which three larger are next above the suture : spire with the 

 outlines nearly rectilinear : apex acute : whorls nine, planulate 

 or concave next below the suture, very convex or suban- 

 gular next above the suture, which is moderately impressed ; 

 last whorl subplanulate anteriorly : aperture subquadrate : 

 labrum thin : columella obliquely produced, nearly straight: 

 umbilicus wanting. 



Mean divergence about 60 ; length .48 inch ; greatest 

 breadth .44 inch ; least breadth .4 inch. 



Station. Under stones at low water mark. 

 Habitat. Panama ; C. B. A. I 



7 specimens were collected on the reef. We have named 

 this pretty species in honor of Isaac Lea, Esq., of Philadelphia. 



276. Trochus lima. 



Synonymy. 



Trochus lima Phil, in Zeitsclir. f. Malak. vol. for 1849. 



p. 159. Mar. 1850. 



Phil, in Kiist. Conch. Cab. pi. 44. f. 15. 1850. 



Station. Under stones, between the low water mark of the 

 spring tides and that of the neap tides. 

 Habitat. Unknown ; Philippi. 



Santa Barbara ; E. Jewett ! Gould MSS. 



Panama ; C. B. A. ! 

 We collected 75 specimens on the reef. 



277. Troclms lividus. 



Synonymy. 



Trochus lividus Phil, in Zeitsclir. f. Malak. vol. for 1849, 



P. 168. Mar. 1850. 



Phil, in Kiist. Conch. Cab. pi. 45. f. 8. 1850. 



This species belongs to the subgenus MODULUS. 



