new Species of Pleurotomidae. 315 



striati, et liris spiralibus tenuibus 6-7 (in anfr. ultimo ad 27) et 

 striis aliis interpositis succincti ; apertura fusccscens, longitudim8 

 totius I ada^quans ; labium loviter incrassatum, superne juxta 

 suturam sinu parvo semicirculari ornatum ; columella tortuosa ; 

 caiialis breviusculus, angustus. 

 Long. 15 mill., diam. 5i. 



Hnh. ? 



The few opaque lactcous lines encircling the wliorlg, chiefly 

 near their middle, are not very distinct. The lines of growth 

 are rather strongly developed, and on crossing the ti'ansverse 

 lirations give them a roughened or subgranose appearance. 

 The labrum in the three specimens examined is scarcely 

 perfect, and possibly therefore it may be lirate within. 



Pleurotoma [Clathurella) crassiUrata. 



Testa oblonga, turrita, alba ; anfractus 7, sutura profunda sejuncti, 

 primus tevis, scquentes duo tenuiter arcuate costati, caiteri con- 

 voxiusculi, costia crassiusculia 9-10 (in anfr, ultimo ad basim 

 continuis) instructi, liria spiralibus 5 (in anfr. ult. circiter 16) 

 super costas incrassatis cincti, et inter liras tenuiter epiraliter 

 striati ; apertura angusta, longit, totius | adajquans ; labrum 

 extus valde incrassatum, intus denticulis 7 armatum, superne 

 leviter sed distincte sinuatum ; columella tenuiter callosa, liris 

 transversis 8-9 munita ; canalis brevis, truncatus. 



Long. 75 mill., diam. 2|. 



Hab. 



The lirations on the columella are rather strongly deve- 

 loped. The uppermost spiral lira on tlie wliorls is slender 

 and situated close to the one adjacent below it. 



Pleurotoma {Clathurella) pachychila. 



Testa elongato-subovata, alba, nitens ; anfract. 7-8 ? (apico abrupto), 

 rcliqui 4 convexiusculi, costis rotundatis circiter 11 (in anfr. 

 ultimo fere ad basim continuis) instructi, et liris spiralibus validis 

 4-5 (in anfr. ult. ad 12) supra costaa leviter incrassatis cincti ; 

 apertura- ovata, longit. totius | ada^qaans ; labrum costa ultima 

 validissima maxime incrassatum, superne levissime sinuatum; 

 columella arcuata, callo tcnui induta ; canalis perbrevis, angustus. 



Long. 4 mill., diam. 1|. 



llah. 



'I'his species is remarkable for the immense thickening of 

 the hibrum ; the liration at the top of the whorls is rather 

 (hickiT than the rest. 



