1890.] MARINE MOLLUSCA OF ST. HELENA. 261 



circa medium ; anfr. ultimus inferne contractus, siibrimatus, 

 liris prcecipuis 6-7, aliisquetenuibus, intercalentibus, ductus ; 

 apertura parva, alhida vel lilacea, cum canali longit. totius 

 dimidium superans ; columella callo tenui, superne tuherculo 

 parvo munito induta ; canalis obliquiis, angustus, recurvus ; 

 lahrum iiitus incrassatum, liris 6-7 instructum. 

 Longit. 14 millim., diam. max. 8. 



This species has much of the character of two species — the one 

 Can. nodulosus from the West Indies, and the other C. luguhris 

 from Panama, both described by C. B. Adams. The spire of the 

 latter species seems to be rather longer than that of the present 

 species; its aperture is consetjuently proportionally shorter, and the 

 coloration is not the same. G. nodulosus, which is very closely 

 allied to the present form, besides being differently coloured, is a 

 somewhat more robust species and has a shorter canal, and the whorls 

 seem to be rather less angular. 



These three forms are difficult to locate generically ; and although 

 I have considered them as belonging to the Tritonidea section of 

 Cantharus, they might with equal propriety be associated with 

 Sistrum. 



Cantharus (Tritonidea) l^vis. (Plate XXI. fig. II.) 



Testa fasiformi-ovata, alba, lineis transversis saturate fascis 

 ornata, inter que costas fusco tincta ; anfr. 10, apicales tres 

 convexi, IceveSyflavescentes, sequentes superne concavi, in medio 

 angulati, infra angulum convexiusculi, costis crassis 9, ad 

 unguium acutis, instructi ; anfr. ultimus elongatus, prope 

 medium contractus, inferne subrimatus ; apertura alba, cum 

 canali longit. totius g superans ; labrum extus valde incras- 

 satum, intus denticulis ad 6 munitum ; columella callo alba, 

 tenui induta ; canalis elongatus, obllquus, recurvus. 



Longit. 23 millim., diam. max. 10; apertura cum canali 12 longa, 

 4 1 lata. 



This pretty species recalls certain forms of the genus Siphonalia. 

 It is unlike most species of Cantharus in having no tubercular sculp- 

 ture, on which account I have called it C. Icevis. 



CoLUMBELLA (Anachis) decipiens (C. B. Adams). 



Buccinum concinnum, C. B. Adams, Proc. Bost. Soc. Nat. Hist. 

 1845. 



Columbella decipiens, C. B. Adams, Contrib. Conch, p. 55 ; Reeve, 

 Conch. Icon. pi. xx. fig. 111. 



Col. crassilabris. Reeve, 1. c. pi. xxviii. fig. 177 a-b. 



Hab. Jamaica (C B. Adams). 



In the Museum are the type of C. crassilabris and the specimen 

 of C. decipiens figured by Reeve. They unquestionably belong to 

 the same species. The figure of the former is not good as regards 

 form, and is very greatly enlarged, although no indication of this 

 appears on the plate. The only specimen from St. Helena forms 

 part of a collection made by Mr. J. Macgillivray many years ago. 



