238 Panama Shells. fissurkllida 



Fissurella nigropwuclata Sowb. Conch. 111. No. 32. pi. YS. f. 51. 1841. 

 Reeve Conch. Icon. pi. 4. f. 8. Aug. 1849. 



Station. — Under stones on the shore ; Cuming I Sowerby : 

 also Eeeve. 



Our specimens were found on rocks at and below half tide level. 

 Some of them have their outlines singularly modified by the 

 surface of the rugged rocks on which they were living. 

 Habitat. — Gallap^go Is., and Lobos I. ; Quming 1 Sowqrby : 

 also Eeeve : ^Iso Miiller. 

 (Jallapago Is. ; Jay. 

 Taboga; C, B. A, I. 

 We collected 95 specimens. Most of them are elongated like 

 the figure in the Conch. Illust., and are narrower than the figure 

 in the Conch. Icon. 



860. Fissurella ostrina. 

 Synonymy. 

 Fissurella ostrina Reeve Conch. Icon. pi. 14. f. 106. Aug. 1850. 



Station. — Unknown, 



Habitat. — Unknown ; Eeeve. 

 Panama ; C. B. A. ! 

 3 specimens were found near Panama. 



361. Fissurella Tirescens. 



Synonymy. 



Fissurella virescens Sowb. in Proc. Zool. Soc. Lond. p. 125. Nov. 1834. 



■ Milll. Synop. Nov. Test. Viv. p. 154. May 1836. 



Sowb. Conch. Illust. No. 31. pi. 13. f. 37. 1841. 



— ^ Reeve Conch. Icon. pi. 4. f. 12. Aug. 1849. 



Station. — In exposed situations at low water ; Cuming 1 

 Sowerby. In exposed situations on rocks at low water ; Cum- 

 ing I Eeeve. 



Our specimens were found on a ledge of rather smooth 

 rooks, between half tide and low water mark, in a place 

 somewhat exposed to the sea. 



