neio Species of ^iQUiotomidsQ. 305 



Pleurotoma [Drillia) bilirata. 



Testa fusiformis, fusea ; anfract. 11, primi 2 la^ves, politi, cseteri 

 convexiusculi, superne inferneque ad suturas carinati (carina 

 superiore maxima) costis rotuudatis versus suturas evanidis (in 

 anfr. ultimo 9 ad peripheriam obsoletis) instructi, circa medium 

 liris spiralibus duabus supra costas valdo promiuentibus et striis 

 teuuibus ornati ; anfr. ultimus liris circiter 1.5 succinctus ; aper- 

 tura purpureo-fusca, long, totius vix f gequans ; columella sub- 

 recta, callo tenui superne cum carina ad suturam tuberculo parvo 

 formanto induta ; canalis mediocris, vix recurvus ; sinus rotun- 

 datus, infra carinam situs. 



Long, 19 mill., diam. 5-^. 



Hah. ? 



The two lirations encircling the middle of the whorls are 

 very prominent on the ribs and almost obsolete in the inter- 

 stices. 



Plexirotoma [Drillia) suavis. 



Testa ovato-fusiformis, lutescens, inter costas rufo tincta ; anfract. 

 7-2^, primi 2^ Iseves, convexi, ca;teri superne concaviusculi, inferne 

 convexi, costis versus suturam superne evanidis (in anfr. ultimo 

 12 in medio obsoletis) instructi, liris spiralibus conspicuis 3 (2 circa 

 medium, tertia juxta suturam inferiorem) striisque tenuibus 

 ornati ; anfr. ultimus liris circa 14 supra costas subnodosis 

 cinctus ; apertura longit. totius -f^ adaequans ; sinus subprofun- 

 dus, paululum infra suturam situs ; canalis brevis, vix recurvus. 



Long. 12 mill., diam. 4. 



Hah. Cape Three Points {Voyage H.M.8. ^Herald'). 

 The two apical whorls are large and give the apex a mam- 

 illated aspect. 



Pleurotoma {Drillia) cretata. 



Testa acuminate- turrita, alba; anfract. 11, superne concavi, inferne 

 convexi, costis obliquis versus suturas evanidis (in anfr. ultimo 12 

 basi attenuantibus) instructi, striis spiralibus (in anfr. superiori- 

 bus 5-6, in ultimo circiter 17) insculpti ; apertura longitudinis 

 totius ^ adaequans ; columella callo crassiusculo ad suturam valde 

 tuberculosa labroque juncto induta ; sinus amento similis ; canalis 

 brevis, recurvus. 



Long. 24 mill., diam. 8. 



Hah. Panama {A. H. Cooke). 



This species differs from P. pallida^ Sow., in having the 

 upper part of the whorls excavated, in the ribs being almost 



