new Species o/" Pleurotomidge. 307 



Hah. Philippine Islands. 



The ribs on the body-whorl are terminated inferiorly by 

 the spiral lirations around the cauda, which are rather thicker 

 than those on the rest of the shell. 



Pleurotoma [Drillia) semipellucida. 



Testa breviter fusiformis, tenuia, alba ; anfract. 10, primi 2 Igeves, 

 politi, cseteri convexiusculi, costis leviter obliquis, flexuosis in- 

 structi (in anfr. penultimo 11, in ultimo 18 basi fero continuis, 

 costis 5-6 ultimis supra tergum anfractus obsoletis), iuter costas 

 subdistanter punctato-striati ; apertura longit. totius ^^ ^d- 

 cequans ; columella callo crassiasculo superne incrassato suturse- 

 que juncto induta ; labium aliquanto expansum, extra leviter 

 incrassatum ; sinus mediocris ; canalis angustus, leviter recurvus. 



Long. 10^ mill., diam. 3|. 



Hob. 



The whorls are very slightly contracted above. On the 

 back of the body-whorl there is one rib very much larger 

 than the rest, and from it to the labrura is smooth. The 

 punctured striatiou is very characteristic. 



Pleurotoina [Drillia) persica. 



Testa breviter fusiformis, nitens, alba, inter costas dilute fusco tincta ; 

 anfract. 8, jDrimi 2 Iseves (secundo medio angulato), cKteri superne 

 excavati, inferne convexiusculi, sutara undulata sejuncti, costis 

 superne obsoletis (in anfr. ultimo 10 basi attenuautibus) instructi ; 

 anfr. ultimus circa caudam liris tenuibus 5-6 ornatus ; apertura 

 longit. totius -Jj ada;quans ; columella caUo tenui ad suturam 

 incrassato induta ; sinus magnus ; canalis brevis, recurvus. 



Long. 9 mill., diam. 3. 



Hah. Persian Gulf {Colonel Pelhj). 



This species resembles D. disjecta considerably at first 

 sight ; however, the larger size and the difference of the ribs, 

 which are not nodulous above, are characters at once distin- 

 guishing it. It is somewhat like D. ohliqui-costata, Keeve, in 

 miniature. 



Pleurotoma {Drillia) paucistriata. 



Testa elongata, breviter subulata, alba, inter costas prope suturam 

 et supra tergum anfr. ultimi dilute fusco maculata ; anfract. 9, 

 primi 2 laeves, Cfeteri stria spiral! paululum infra suturam sita 

 bipartiti, costis superne nodulosis, obliquis instructi (in anfr. 

 penult. 11, in ultimo circiter 5, caeteris obsoletis), striis distanti- 

 bus 2-3 (in anfr. ultimo ad 0) insculpti ; apertura brevis, longit. 



