RISSOIDJ<]. ]03 



I have followed Hcrr Schwartz in not considering it desir- 

 able to change the specific name to costata. 



17. Eissoa subcostulata. 



Rissoa subcostulnta, Schwartz von Mohrenstern, Benin K. ATc. Wissens. 

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

 variabilis, Mhlf] 



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



var. sublsevis. 



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

 von Mohrenstern. 



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



18. Rissoa pulchella. 



Rissoa pulchella, PhiJippi, Enum. Moll. Sicil., 1836. 



6 Mediterranean : coll, Herr Schwartz von Mohrenstern. 



19. Rissoa similis. 



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

 li. costulata, Alder. 



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



Mohrenstern. 

 15 Algiers ; coll. P. Joly, Esq. 



var. Isevis. 



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

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



16 Algiers; coll. P. Joly, Esq. 



20. Rissoa parva. 



Turbo parvus, Ba Costa, Brit. Conch. 1779 ; fide Jeffreys, vars. interrupta 

 Ads. and exilis, also= Cingula alba, Fleming, Sfc 



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

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



