ACM^EA. 41 



of form are shown by figs. 18 and 19, representing small specimens. 

 The best figure referred to by Gmelin is that in Knorr's " Vergnugen 

 der Augen, etc. vi, pi. 28, fig. 9, really an excellent figure. The fig- 

 ure in Lister is less characteristic ; and Martini's figures do not 

 belong to this species at all. This last fact precludes the use of the 

 name melanoleuca Gm. for this species, and indeed it is only in the 

 last few years that the name has been so used. The melanoleuca of 

 Keeve is not this shell. Unquestionable synonyms are P. albicosta 

 Ad. (albicostata Rv.), figures 22, 23 ; P. balanoides Rv. figs. 24, 25 ; 

 and P. occidentalis Rv. fig. 26. A more doubtful form is P. cime- 

 liata Rv. figs. 14, 15, of pi. 5, said to be from Honduras. 



A label in our museum, written by Robert Swift, gives the name 

 " Patella fungus Mke." as a synonym of P. albicosta. I have seen 

 no description of P. fungus. 



A. CUBENSIS Reeve. PL 4, figs. 56, 57, 58, 59, 60, 69, 70. 



Shell solid, ovate, elevated, the apex a little in front of the middle ; 

 surface sculptured with numerous narrow riblets, often obsolete. 

 Closely marked all over with bifurcating and anastomosing black 

 lines on a white ground, the black sometimes confluent into large 

 blotches. Edge of shell smooth. 



Inside white with a brown central area marbled with white ; 

 rarely entirely white ; border very narrow, black with light dots, or 

 light with black dots. Length 21, breadth 16, alt. 10 mill. 



St. Thomas, St. Croix, Guadeloupe etc., West Indies north to the 

 Bahamas. 



Patella cubensis RVE., Conch. Icon., f. 125, 1855. P. melanoleuca 

 RVE. I. c., f. 134, not P. melanoleuca GMELIN. P. leucopleura 

 REEVE, I. c.,f. 138. 



This is a solid, conical species, having the riblets much more 

 numerous and finer than A. leucopleura, and marked in a peculiar 

 pattern of forking and anastomosing black lines. The variations of 

 this pattern are sufficiently shown by the figures. 



Of the names applied to this species, none prior to Reeve's can be 

 identified with any confidence. P. melanoleuca Gm. is much more 

 likely to be Subemarginula nolata L. than this species. The figures 

 in Martini referred to by Gmelin correspond exactly with half- 

 grown notata, but are too depressed for A. cubensis; and in any 

 case leucopleura has priority. P. melanosticta Gm. is a wholly differ- 

 ent shell, evidently a depressed species (" planiuscula"), larger and 

 differently marked. Neither description nor figure apply to cubensis. 



