1;94 Panama SMlsi tboCHID^'. 



Acapulco; Humboldt & Bonplandl Valenciennes. 



California; Philippi. 



West. Coast of Mexico and Pentral America; 



Kiister. 

 Taboga and Panama ; C. B. A. 1 

 On the reef at Panama we collected 5 specimens ; at Taboga 

 we collected 500. 



280. Trochus reticulatus. 



1 /Synonymy. 



Trochus reticulatus Wood Ind. Test. Supp. pi. 6. f. 38. 1828. 



,,. , ,., , . , .KUst, Conch. Gab. pi. 14. f. 10. • 1847. 



Station. — Under stones at the low water mark of the neap 

 tides. 



Habitat. — Unknown ; Wood. 



Panama ; C. B. A. I 

 We collected 600 specimens on the reef. 



TURBO.— The diffference between the shells of Turbo and 

 of Trochus is of little value. The peculiarities of form, which 

 distinguish these genera, are not only inconsiderable and ill 

 defined, but they are also unaccompanied with corresponding 

 differences in the texture, sculpture, or other characters of the 

 shells, or in the characters of the soft parts of the animals. A 

 great' number of other genera present iu each a difference of 

 outline equal to that which here is made the ground of generic 

 distinction. 



The calcareous and the horny opercula present a well defined 

 character. This distinction, however, is not accompanied by 

 corresponding differences in the shells and in the soft parts, and 

 therefore cannot be regarded as of much zoological value. But 

 on account of its convenience we shall for the present distin- 

 guish these genera by this character.. 



