Keebs— West-indian Bissoinae. 
49 
one specimen from Cuba. S. v. Mohrenstern takes it to b© 
a variety only of R . bryenea Mont. 
8. Rissoina chesneli Michaud. 
B. chesneli, Mich. Rescript, des coquilles nouvelles, 
V- 77. 
B. catesbyana, Orb. Mist. Nat. Cuba , part 2, p. 24, 
pi. 2, f. 1—3. 
B. Candida Brown, III, Conch . p. 11, pi. 9, f. 75. 
B. scalarella, C. B. Adams , Broc. Bost. Soc. Nat. 
Hist, vol, ii. p. 6. 
B. chesneli, S. v. M. p. 73, f. 38, 39. 
Professor C. B. Adams in his “ Contributions to Con- 
chology” (p. 113) remarks that R . scalarella is closely 
allied to R scalarioides ; it has on each whorl 12 to 14 ribs 
which are larger than in R. scalarioides : and it has in large 
specimens the following dimensions : mean divergence 
about 24°, length of spire (H inch, total length 0*155 inch, 
breadth 0*06 inch. 
Habitat. Mauritius (?) Antilles, Bahamas, Mediterra- 
nean (?) 
Division ill. — With very fine and closely set longitudinal 
lines . 
1. Rissoina reticulata Sowerby 
Genera of Shells, pi. 208, f. 1. 
S. v. M* op. cit. p. 74, f, 40. 
Schwartz von Mohrenstern remarks that the Rissoa 
reticulata Phil, given as a synonym to R. reticulata Sow. 
by Beeve (Conch. Syst. p. 152) is a mistake arising from 
the similarity of the name ; hut the two shells are distinct 
species belonging to different genera. The same author 
mentions that Rissoina princeps Adams may not be the 
same, hut it is closely allied to R. decussata Montague, R. 
