CERiTHiUM. Panama Shells. 153 



Habitat. — Panama ; Hinds I 



Taboga; 0. B. A.! 

 19 specimens were collected. 



198. Cerithium interruptum } 



Synonymy. 



? Cerithium interruptum Menke. Zeitsch. Mai. p. I'J'S. for 



1850. - - - . Apr. 1851. 



Our specimens are, for the most part, much larger than those 

 which Dr. Menke describes. In other respects, they answer to 

 his description as nearly as could be expected in a species with 

 variable characters. Menke's shell is 5.4 lines long, and many 

 of our specimens are 1 inch long. 



Station. — On and under rocks and stones, between half tide 

 level and the low water mark of neap tides. 



Habitat. — Mazatlan ; Melchers I Menke. 



Taboga and Panama ; C. B. A. I 

 ' 1100 specimens were collected, 



199. Cerithium . Sp. indet. 



This shell is so nearly related to the preceding that it may be 

 a question whether it should rank as a distinct species. It is 

 larger, being 1.2 inch long; and is wholly black, except the 

 eroded apex : it has one series of sharp tubercles, and the spiral 

 grantdar lines are more prominent and more nearly equal than 

 in C. interruptum. 



Station. — ^Like that of G. interruptum. 



^aiitat— Taboga ; 0. B. A. I 



Thirty specimens were collected. 



JULY, 1852. 39 Am. Lto. NiT. Hibt. 



