100 RISSOIDE. 
Genus FOLINIA, Crosse. 
J. de C., 1867, type Rissoa insignis, Folin, from Panama. 
Two species have since been described from Suez in the 
“Fonds dela Mer,” but not figured! I have never seen the 
Genus. 
Genus RISSOA, Fréminville, ms. 
Desmarest, Bull. Sci. Soc. Philom. 1814, type RB. violacea, Desm.; type fide 
Gray, P. Z. 8. 1847, R. labivsa [= membranacea] ; type fide Herrm., 1848, 
Turbo cimex ; sect.= Mohrensternia, Stol., Paleont. Ind. 1867, type R. 
angulata, Hichw. ; sect.= Zippora, Leach, Syn, Moll. Gt. Brit. 1852, type 
R. auriscalpium, Lin. ; sect.=Rissostomia, Sars, Moll. Norveg. 1878, type 
R. membranacea, J, Ad. [as Z, drummondi, Leach.] 
1. Rissoa sulzeriana. 
Alvania sulzeriana, Risso, Hist. Nat. Mer. 1826. 
3 Piedmont [fossil] ; coll. Herr Schwartz von Mohrenstern. 
, 
2. Rissoa lachesis. 
Turbo lachesis, Basterot, Mém. Geol. Bord., 1825. 
5 Steinabrunn [fossil] ; coll. Herr Schwartz von Mohrenstern. 
8. Rissoa albella. 
Rissoa albella, Lovén, Index Moll. Scand., 1846, Bohnsléu; var.=R. sarsti 
Lov., Bergen, fide Jeffreys. 
6 “ Kattegat;” coll. Herr Schwartz von Mohrenstern. 
4, Rissoa decolorata. 
Rissoa decolorata, Philippi, Mal. Zeits., 1846, Lesina—long. 8, diam. 14. 
8 Mediterranean ; coll. Herr Schwartz von Mohrenstern. 
5. Rissoa interrupta. 
Turbo interrupta, J. Adams, Trans, Lin, Soc. V, 1798; fide Jeffreys +R. 
parva, var, 
