OF CONCHOLOGY. 



25 



The apex as well as base is occasionally stained with dark 

 purple or black, and specimens are met with faintly banded 

 with brown or yellow. 



The figure in Conch. Reunion is not correctly colored, and 

 does not agree in that respect with the description. 



DAPHNELLA BELLA, Pse. 



f Daphnella bella, Pse. Proc. Zool. Soc, 1800, p. 147. 

 Pleurotoma gemmulata, Desh. Conch. Reunion, p. 107. 



The. above generic name was attached to this species by the 

 late Mr. Cumings, when forwarded to him with the description. 

 1 allow it to remain unaltered, as it does not agree with any one 

 of the divisions of Pleurotomidce. It resembles somewhat C'o- 

 lumbella. 



The Bourbon specimens are identically the same as those in- 

 habiting the Hawaiian Islands. 



Cerithium janthlnum, Gld. 



C.janihinum, Gld. Proc. Bost. Soc, 1849, p. 121. 

 0. aspersum, Desh. Conch. Reunion, 1863, p. 97. 



The name given to this species by Dr. Gould is an unfortunate 

 one, as specimens wholly purple are of rare occurrence. As 

 remarked by M. Deshayes, the species is very variable as to 

 color, and I would add, the most so of any of the genus. Of over 40 

 specimens in my collection, no two are alike as to color or mark- 

 ing. They are wholly purple, or yellow, or violet, or white, or 

 rose color, or various shades of brown ; they are light with a dark 

 sutural band, or banded, or spotted, or lineated with various 

 colors. The varices are, however, invariably Avhite. 



Triforis incisus, Pse. 



T. incisus, Pse. Proc. Zool. Soc, 1860, p. 434. 

 T. triliratus, Desh. Conch. Reunion, p. 102. 



The description by M. Deshayes was evidently taken from 

 an immature specimen. It varies somewhat in color, being 

 wholly brown, or obscurely mottled with pale colors. 



On mature specimens, the punctures are longitudinal in shape. 



Perna hawaiiensis, Pse. 



P. californica, Conr. Jour. Acad. Phil., 1837, p. 245. 



The above species is confined in its distribution to the Hawaiian 

 Islands. As doubts have arisen as to its identity for reason of 

 its name, which is a misnomer, I have thought advisable to 

 change it as above. 



