50 
PSOCEEDIXGS OF THE SCIENTIFIC ASSOCIATION. 
striatocostata Orb., R. janus Adams, R. multicostata Adams, 
and R. striosa Adams, amongst recent species, and to 
R. obsoleta Fartsch, and R . cochleanella Lam, among fossil 
species. Habitat : Jamaica, Antilles (? Phillipines, Mau- 
ritius). 
2. Rissoina decussata Montague. 
Helix decussata, Mont. Test. Brit. p. 399. 
Turbo ,, Dillwyn , Recent Shells, p. 882. 
Bissoa cochleanelia, Basterot ('part) Mem. glol. sur . 
Bordeaux , p. 37, 
Phasianella decussata, Fleming , Brit. An. p. 302. 
Fissoa alata, Merihe, Synopsis , p. 138. 
,, striatula, Andr%egowshi , Bull. Soc. Geol. Franc 
1835, p. 321. 
Hissoina striatocostata, Orb. t Moll. Cuba vol. ii. p. 27, 
pi. xii, f. 30 — 32. 
Fissoa pyramidella, Brown , III. Conch. Great Britain) 
p. 11 (probably). 
,, costulina, Sismonda , Syn. Meth. p. 53. 
,, striosa, C. B. Adams , Contr. Conch, p. 116. 
Eissoina subcochleanella, Orbigny , Prodrome, vol. iii, 
p. 29. 
Kissoa janus, Adams , Cat. Panama , p. 538. 
Hissoina decussata, Hoernes , Foss. Moll. TPien. p. 553, 
pi. 48, f. 1. 
,, decussata, S. v. M. p. 81, f. 44, 44a. 
Schwartz von Mohrenstern mentions the affinity of this 
species to R. reticulata Sow. and to the fossil R. obsoleta 
Partsch ; and he states that the number of longitudinal 
ribs varies from 22 to 45 : he thinks that the specimens 
with very fine ribs may be separated as a variety : to this 
would belong R. striatocostata Orb. and R. janus Adams ; 
