ZOOLOaY OF FEHNANDO NORONHA. 



495 



the interior at the apex indented with a transverse line or pit at 

 the larger end of the perforation, as described by Say. 



36. ? EissuBELLA BARBADENSis, Gmelin. 

 Hob. West Indies. 



There are two or three specimens from Fernando Noronha 

 which closely approach this species, but I do not feel absolutely 

 certain of the identification. 



37. ? FissuRELLA NUBECULA, Liiine. 



Hal. Mediterranean, Spain, Morocco, coast of G-ambia, Cape 

 Verd Islands. 



Several specimens from Fernando Noronha in some respects so 

 closely resemble this species that I hesitate to separate them. 

 The interior is of the same greenish tint, the orifice has a purplish 

 tint or is ringed with purple, but the outer surface is uniformly 

 darker than Mediterranean examples. With regard to sculpture 

 it is difficult to say that any material difference exists, as 

 specimens from any given locality exhibit slight variations in the 

 fineness and number of the radiating strise, such as may be noted 

 in the series from Fernando Noronha. 



38. AcM^A NOKONHENsis, sp. n. (Plate XXX. figs. 3, 3 a.) 

 Testa ovata, postice latior, mediocriter elevata, nigrescens, 



radiis pallidis picta, ad apicem, paulo ante medium situm, erosa, 

 nigra, radiatim tenuiter striata, lineisque incrementi sculpta; 

 pagina interna intra cicatricem nigricans, apicem versus callo 

 tenui sensim albicans, extra cicatricem fere ad marginem cseruleo- 

 albida, ad marginem anguste nigro limbata, antice ab aj)ice usque 

 ad marginem radio lato obscuro et postice alio latiore picta. 

 Long. 24 millim., lat. 19, alt. 9. 



This species has a smoother surface than A. suhrugosa, d'Or- 

 bigny (=Lottia ony china, Gould), from E-io Janeiro. Like that 

 species, however, it has in the interior a broad obscure ray from 

 the apex to the margin in front and a broader one at the opposite 

 end. These rays, however, are more distinct in the present 

 species than in the Brazilian shell. The external radiating stride 

 being very fine, do not, as a rule, produce a crenulated margin, 

 but in some instances a slight crenulatiou occurs. Tfie surface 

 within the muscular scar is almost black, forming a marked con- 

 trast to the pallid space between it and the black margin. The 



