UISSOID^l. 103 



I have followed Herr Schwartz in not considering it desir- 

 able to change the specific name to costata. 



17. Eissoa subcostulata. 



Rissoa subcostulata, Schwartz von Mohrenstern, Deriks K. Ak. Wissens. 

 Wien, XIX, 1860, for R. costulata, Alder, 1844, not of Risso 1826 \_ = R. 

 varialilis, Mhlf.] 



20 Weymouth, &c. ; coll. G. Nevill, Esq. 



var. sublsevis. 



28 Algiers, &c., Mediterranean ; coll. P. Joly, Esq., and Herr Schwartz 

 vou Mohrenstern. 



Some of these were sent me by M. Joly as " var. Icevis." 



18. Rissoa pulchella. 



Rissoa pulchella, Philippi, Enum. Moll. SlciL, 1836. 



6 Mediterranean : coll. Herr Schwartz von Mohrenstern. 



19. Rissoa similis. 



Rissoa similis, Scacchi, Catal. p. 14, 1836, Italy; fide Jeffreys, small var. of 

 R. costulata, Alder. 



30 Mediterranean; ex c. Dr. F. Stoliczta and Herr Schwartz von 

 Mohrenstern. 



15 Algiers ; coll. P. Joly, Esq. 



var. Isevis. 



R. similis var. Isovis, Watson, P. Zool. S. 1873, Madeira ; fide Monter. 

 R. gemmula, Fischer, Fonds de la Mer, pi. XXIII, Gulf Gascon^. 



16 Algiers; coll. P. Joly, Esq. 



20. Rissoa parva. 



Turbo parvus, Da Costa, Brit. Conch. 1779 ; fide Jeffreys, vars. ititerrupta 

 Ads. and exilis, a'so= Cingula alba, Fleming, fye. 



100 Mediterranean, N. W. France, England, and Biarritz ; coll. Miss Beau- 

 fort, Herr Schwartz von Mohrenstern, and G. Nevill, Esq. 



