ZOOLOGY OP FERNANDO NORONHA. 495 
the interior at the apex indented with a transverse line or pit at 
the larger end of the perforation, as described bv Say. 
36. P Fissurella barradensis, G-melin. 
Hal. 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, Linne. 
Hal. Mediterranean, Spain, Morocco, coast of Gambia, Cape 
Yerd 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 striae, such as may he noted 
in the series from Fernando Noronha. 
38. Acalea noronhensis, 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 cmruleo- 
albida, ad marginem anguste nigro limbata, antice ab apice 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. sulrugosa , d’Or- 
bigny (— Lottia ony china, Gould), from Rio 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 strife 
being very fine, do not, as a rule, produce a crenulated margin, 
but in some instances a slight crenulation occurs. The surface ' 
within the muscular scar is almost black, forming a marked con- 
trast to the pallid space between it and the black margin. The 
