172 Panama Shells. LITTOKINID^. 



Habitat. — Panama ; 0. B. A. I 

 3,300 specimens were collected. 



234. liittorina conspersa. 



Synonymy. 



Littorina conspersa Phil. Abbild. II. pi. 4. f. 14. March 1847. 



Some individuals, of a more ventricose form and with 

 broader striae, approximate towards L. jouncticulata Phil. ; but 

 for the most part the two species are easily distinguished. 



Station. — This species was found chiefly on large fragments 

 of rock at high water mark. 



Habitat. — Eeal Llejos ; Philippi. 



Taboga and Panama ; 0. B. A. 1 

 320 specimens were collected. 



235. Liittorina (?) excavata. Nov. sp. 



Shell obliquely ellipsoidal : very dark brown at the apex, in 

 the umbilical region and in the fauces, otherwise pale horn 

 color : with several spiral raised lines, and intermediate very 

 minute spiral striae ; apex subacute : spire small, with the out- 

 lines very curvilinear : whorls nearly four, compressed, with a 

 distinct suture ; last whorl ventricose : aperture subovate : 

 labrum very sharp, but thickened much a little behind the 

 edge: columella dilated and thickened: region around the 

 umbilicus much excavated : umbilicus small. 



Mean divergence about 90° ; length .17 inch ; breadth 

 13 inch ; length of spire .04 inch. 



The generic character of this species is doubtful. It resem- 

 bles a small Nabica. 



Station. — Unknown. 



Habitat. — Panama ; C. B. A. I 



1 specimen was found in the sand. 



