TROCHUS. Panama Shells. 193 



Station. Unknown. 



Habitat. Unknown ; Philippi. 



Acapulco ; E. Jewett ! Gould MSS. 



Taboga ; C. B. A. ! 

 We found 3 specimens. 



278. Trochus Panamenis. 



Synonymy. 



Trochus Panamensis Phil, in Zeitschr. f. Malak. p. 127. Aug. 1848. 

 Phil, in Kiist. Conch. Cab. pi. 44. f. 16. 1850. 



Fresh specimens are very dark colored ; but by exposure the 

 shell fades to a red color, as in Kiister's figure. 



Station. Under stones at low water mark. 



Habitat. Panama ; B. B. Philippi ! Philippi. 



Panama ; C. B. A. ! 

 65 specimens were collected on the reef. 



279. Trochus pellis-serpentis. 



Synonymy. 



Trochus pellis-serpentis Wood Ind. Test. Supp. pi. 5. f. 4. 1828. 



Turbo Valenc. in Humb. Rec. Obs. II. 273. 1833. 



Trochus strigilatus Phil. Abbild. I. pi. 2. f. 9. Nov. 1843. 



pellis-serpentis Phil. Abbild. I. Index. 



KUst. Conch. Cab. p. 105, pi. 17. f. 4. 1849 ? 



Station. On or under rocks and large stones near half tide 

 level. When the tide retires, these animals crawl around over 

 the surfaces of stones and rocks, beneath which they retire 

 after the surfaces become dry. They are therefore collected 

 most easily when following the tide out. We saw them in the 

 greatest numbers and most active at twilight. 



Habitat Panama ; Wood : also Jay. 



