490 Mr. E. A. Smith's Diagnoses of 



infra medium contractus, carinis 12-13 et inter has striis spira- 

 hbus exihbus ornatus ; ajjertura parva, basi angustata, longi- 

 tudinis testse 5 fere a^quans, intus hris intrantibus 4-5 munita ; 

 labrum tenuc, medio proniinens, supra earinam maximam fissura 

 latiuscula sed hand profunde incisum ; columella leviter sinuata, 

 callo tenuissimo induta ; cunalis mediocriter brevis, vix recurvus. 

 Long. 22 mill., diam. fere 7. 



Hob. ? 



It is with considerable hesitation that I aj^ply a name to 

 this form, on account of its close relationshipwith/ztJaia, Hinds. 

 The chief differences are the narrower form, larger tubercles, 

 and shorter canal, in the latter character bearing the same rela- 

 tion to juhata as cingulifera (Lamarck) does to his albina. 



Pleurotoma retusispii'ata. 



Testa elongato-subfusiformis, dilute purpurascens, ad apieem ob- 

 tusum saturatior ; anfract. 8, primi 2 (nucleus) vitrei, politi, 

 globosi, sequeiites 5 bicarinati (carina supcriore duplici) liraque 

 intercurrente nodosa cincti, inter carinas liris lougitudinalibus 

 confertis, tenui'tus ornati, sutura canaliculata discreti ; anfr. ulti- 

 mus ad pcripheriam rotundatus, deinde contractus caudam brevem 

 formans, carinis ad 12 subajqualibus succinctus; apertura parva, 

 longitudinis testae ^ paulo superans, intus sulcata, sidcis costis 

 externis respondentibus ; labrum margine levissime incrassatum 

 et creniilatum, paululura supra medium fissura parva incisum ; 

 columella medio plicis duabus minutis (superiore fere obsoleta) 

 munita, ad basim dextrorsum curvata ac infra labrum descendens ; 

 canalis brevis, recurvus. 



Long. 7| mill., diam.^ 2^. 



Hah. ? 



The present species has for its nearest relative P. violacea^ 

 Hinds, from which it difl'ers in form somewhat ; the apex is 

 blunter ; and there is but a single nodose liration around the 

 middle of each whorl, whereas Hinds's species possesses two. 



Pleurotoma cognata. 



Testa elongato-subfusiformis, hiteo-albida, versus apieem dilute 

 purpurea, carinis albis cincta, et inter carinas striis tenuibus longi- 

 tudinaliter insculpta ; spira perelongata, acuta, lateribus rectis ; 

 anfract. 12?, sutura carinata sejuneti ; primi 4? (abrupti), 

 sequentcs 7 medio concavi, carinis duabus validis, remotis, et inter 

 carinas liris 2 exilibus, cincti ; unfr. ultimus basi contractus, 

 caudam brevem formans, carinis ad 12 (quarura superiores 3 max- 

 imae) cinctus ; apertura alba, angusta, basi paululum contracta, 

 longitudinis testae ^ sequans ; fissura minime profunda, inter 

 carinas primam seeundamque sita ; labrum tenue, margine cre- 

 nulatum ; columella medio obsolete uniplicata ; canalis brevis, 

 obliquus, leviter reflexus. 



Long. 24 mill., diam. 7. 



