500 ME. H. N. EIDLET OK THE 



54. Spondtlus, sp. 



A few odd valves picked up on the shores are too much worn 

 to be identified with certainty. About a dozen forms have been 

 described as West-Indian ; and doubtless it is one or more of 

 these s^^ecies which occur at Fernando Noronha. 



II. TERRESTRIAL SPECIES. 



1. IlELIx(OpnTOGTBA?)QUINQTJELIRATA. (Pl.XXX. figS. 7-7c.) 



Testa discoidea, supra leviter convexa, in feme anguste umbi- 

 licata, tenuis, viridi-flavescens, nitida ; anfractus 7, lente accres- 

 centes, eonvexi, incrementi lineis striati, supra peripheriam in- 

 distiucte concavus, autice hand desceudens, intus plicis tribus 

 insequalibus perlucentibus munitus, lamellisque duobus validis 

 parietalibus iustructus ; apertura semilunata, parva; peristoma 

 tenue, hand expansum. 



Diam. maj. 6 millim., min. 5g, alt. 3. 



Hah. Found, both living and dead, at the north end of the 

 island, also on Platform Island. 



a. entoJonta, Pfeiffer, from Ecuador, is an allied form ; but 

 has a flatter spine, more open umbilicus, and no parietal lirse. 



2. BuLiMUs (ToMiGEETJs) Ramagei, sp. n. (Plate XXX. fig. 8.) 

 Testa subovata, rimata, solida, fusca, zonis angustisalbis traus- 

 versis (in anfr. ultimo quatuor) cincta ; anfractus 5, convexiusculi, 

 lineis incrementi subrugosis, striisque tenuissimis spiralibus 

 sculpti, idtimus magnus, antice desceudens, post labrum con- 

 tractus, scrobiculatus ; apertura irregularis, longitudinis totius | 

 paulo superaus, dentibus quatuor inrequalibus (duobus parvis in 

 pariete aperturali, uno magno compre^^so in margine dextro, uno 

 tuberculiformi valido in margine columellari) munita; peristoma 

 album, valde incrassatum, leviter reflexum, marginibus callo craso 

 junctis. 



Longit. 23|^ millim., diam. 16. 

 17L 12J- 



The above measurements show that considerable difl^ereuce 

 exists in the size of specimens ; and it is a curious fact that the 

 smallest example, obtained from a native, is the only one which 

 appears in fairly fresh condition. All the rest A^ere found by 

 Mr. Ramage imbedded in sandy mud on a raised reef at Tobacco 

 Point, and have a semi-fossilized appearance. 



The only forms at all approaching that now described are the 



