498 Mr. E. A. Smitli's Diagnoses of 



Pleurotoma [Drillia) Prattii. 



Testa fusiformis, turrita, dilute fulva ; anfract. 10, superne exca- 

 vati, medio rotuiidatc angulati, costis obliquis rotundis (in anfr, 

 lilt. 9 ad peripheriam sensim desinentibus) instructi, ubique 

 spiraliter exiliter stria ti, sutura leviter margiuata ; anfr. nltimus 

 magnus, post labrum valde tuberose incrassatus, striis spiralibus 

 magis profundis incremcntique lineis ornatus; apertura angustius- 

 cula, earnea, longitudiuis totius fere \ sequans ; sinus magnus, 

 latus, prope suturam situs ; canalis leviter obliquus et recurvus ; 

 columella txibereulo calloso parvo superne munita. 



Long. 27 mill., diam. 8, 



Hob. ? 



The few rounded oblique ribs, which do not extend to the 

 .suture above, and the uniform bright reddish brown or fulvous 

 colour are the characters whicli chiefly distinguish this species. 



Pleurotoma [Drillia) excavata. 



Testa fusiformis, turrita, luteseens ; anfr. 9, primi 2 lajves, caeteri 

 superne valde oblique excavati, medio obtuse angulati, longitu- 

 dinalitcr costati, costis ad excavationem finitis (in anfr, ultimo 

 14 infra medium desinentibus), liris spiralibus (iis in excavatione 

 exilioribus quam inferiores) supra coslas incz'assatis cincti ; aper- 

 tura longit. totius ad ^"^^j sequans ; sinus medioeriter profun- 

 dus, proximo ad suturam situs ; canalis paululum elongatus, 

 recurvus ; columella rectiuscula, callo tenixi amicta. 



Long. 20 mill., diam. 6^. 



Hah. ? 



The ribs do not extend into tlie excavation or concave 

 depression at the upper part of the whorl ; and the five or six 

 lirations encircling it are finer than those below it. 



Pleurotoma [Drillia) concolor. 



Testa clongata, fusiformis, turrita, rubido-fusca (interdum pur- 

 pureo-fusca) ; anfract. 13, primi 2 convexi, Iseves, caeteri superne 

 coneavi, medio angulati, costis longitudinalibus supra versus 

 suturas obsoletis (in anfr. ultimo circiter 11 basi obsoletis) in- 

 structi, et in anfractuum dimidium iuferius liris clevatis spiralibus 

 3 (in anfract. ult. ad 6) supra costas nodulosis clatbrati, ubicjue 

 striis spiralibus gracillimis increraentique lineis flexuosis ornati : 

 sutura undulata, aliquanto incrassata ; apertura angusta, longi- 

 tudiuis testis ad j aequans ; labrum tenue, margine crenulatum, 

 intus laeve, superne paululum infra suturam late profundeque 

 incisum ; columella subrecta, callo tenui induta, tuberculo parvo 

 juxta suturam munita; canalis latiusculus, leviter recurvus. 



Long. 43 mill., diam. 11. 



Ifah. Moluccas and (jliina. 



