RISSOIDA. 108 
I have followed Herr Schwartz in not considering it desir- 
able to change the specific name to costata. 
17. Rissoa subcostulata. 
Rissoa subcostulata, Schwartz von Mohrenstern, Denks K. Ak. Wissens. 
Wien, XTX, 1860, for R. costulata, Alder, 1844, not of Risso 1826 [=R. 
variabilis, Mhif.] 
20 Weymouth, &c.; coll. G. Nevill, Esq. 
var. subleevis. 
28 Algiers, &ec., Mediterranean; coll. P. Joly, Esq., and Herr Schwartz 
vou Mohrenstern. 
Some of these were sent me by M. Joly as “ var. levis.” 
18. Rissoa pulchella. 
Rissoa pulchella, Philippi, Enum. Moll, Sicil., 1836. 
6 Mediterranean: coll. Herr Schwartz von Mohrenstern. 
19. Rissoa similis, 
Rissoa similis, Seaceh, Catal. p. 14, 1836, Italy; fide Jeffreys, small var. of 
R. costulata, Alder. 
30 Mediterranean; ex v. Dr. F. Stoliczka and Herr Schwartz von 
Mobrenstern. 
15 Algiers; coll. P. Joly, Esq. 
var. levis. 
R. similis var. levis, Watson, P. Zool. S. 1873, Madeira; fide Monter. 
R. gemmula, Fischer, Fonds de la Mer, pl. XXIII, Gulf Gascony. 
16 Algiers; coll. P. Joly, Esq. 
20. Rissoa parva. 
Turbo parvus, Da Costa, Brit. Conch. 1779 ; fide Jeffreys, vars. interrupta 
Ads. and exilis, also= Cingula alba, Fleming, &e. 
100 Mediterranean, N. W. France, England, and Biarritz ; coll. Miss Beau. 
fort, Herr Schwartz von Mohrenstern, and G, Nevill, Esq. 
