Krebs — Westindxan Bissoikae. SI 
in these the lines form a fine network ; but in the speci- 
mens with the coarse longitudinal lines the spiral lines are 
only visible on the lower part of the last whorl. The lon- 
gitudinal lines are often few on the upper whorls and in- 
crease in number on the lower ones ; if decreasing on the 
lower whorls the spiral lines are very distinct. Such va- 
rieties are found both in the recent and the fossil shells. 
Habitat : Jamaica, Panama, Bahamas, Virgin Islands ; 
Mediterranean, Mauritius, Eastern Seas. Possil in Europe. 
3. Rissoina multicostata Adams 
C. B. Adams, Contr. Conch, p. 114 
S. v. M. op. cit . p. 86, f. 48 
Habitat : Cuba, Jamaica. 
Division IV.— -Cancellated. 
1. Rissoina bicollaris , S. v. M. op. cit. p. 87 f. 50, nearest 
to R. fenestrata S. v. M., but the longitudinal ribs 
are more numerous and larger. 
Habitat : Westindies. 
2. Rissoina fenestrata Schwartz, S v. M, op. cit. p. 88, 
f. 51. Approaches R. clathrata Adams, but the 
aper ture is narrower and straighter ; the longitu- 
dinal ribs are straighter and the entire shell much 
smaller. Habitat •• Cuba. 
3. Rissoina cancellata Philippi. 
B. cancellata, Phil,, MalaJc . Zeitschr. 1847, p. 127. 
— pulchra, Adams, Contr . Conch, p. 114. 
— philippiana, PJeiff. 
— cancellata, S. v. M. op, cit. p. 89, f. 52. 
Habitat •* "Westindies. 
4. Rissoina sagraiana Orb. 
Orb . Moll. Cuba, pt. ii, p. 25, pi. xii, f. 4, 5. 
8. v. M. p. 90, f. 54. 
