CERITHIUM, Panama Shells. 153 



Habitat. Panama ; Hinds ! 



Taboga ; C. B. A. I 

 19 specimens were collected. 



198. Cerithiiim interruptum \ 



Synonymy. 



1 Cerlthium interruptum Menke. Zeitsch. Mai. p. 178. for 



1850. Apr. 185L 



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 ! Menke. 



Taboga and Panama; C. B. A.! 

 1100 specimens were collected. 



199. Cerithiiim . Sp. inclet. 



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 

 granular lines are more prominent and more nearly equal than 

 in C. interruptum. 



Station. Like that of C. interruptum. 

 Habitat Taboga, ; C. B. A. ! 

 Thirty specimens were collected. 



JULY, 1552, 11 AMR, LTC, N*T. Hurt 



