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



Pleurotoma [Drillia) Prattii. 



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

 vati, medio rotundate angulati, costis obliquis rotundis (ia anfr. 

 ult. 9 ad peripheriam sensim desinentibus) instructi, ubique 

 spiraliter esiliter striati, sutura leviter marginata ; anfr. ultimus 

 magnus, post labrum valde tuberose incrassatus, striis sj^iralibus 

 magis profundis incremeutique lineis ornatus; apertura angustius- 

 cula, carnea, longitudinis totius fere ^^ sequans ; sinus magnus, 

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

 columella tuberculo calloso parvo superne munita. 



Long. 27 mill., diam. 8. 



Hah. ? 



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 which chiefly distinguish this species. 



Pleurotoma [Drillia) excavata. 



Testa fusiformis, turrita, lutescens ; anfr. 9, primi 2 laeves, caeteri 

 superne valde oblicjue 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 costas incrassatis ciiicti ; aper- 

 tara longit., totius ad ^V sequans ; sinus mediocriter profun- 

 dus, proximo ad suturam situs ; canalis paululum eiongatus, 

 recurvus ; columella rectiuscula, callo tenui amicta. 



Long. 20 mill., diam. 6^. 



Hah. ? 



The ribs do not extend into the 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 elongata, fusiformis, turrita, rubido-fusca (interdum pur- 

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

 concavi, medio angulati, costis longitudinalibus sujjra versus 

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

 structi, et in anfractuum dimidium inferius liris elevatis spiralibus 

 3 (in anfract. ult. ad 6) supra costas nodulosis clatbrati, ubi(]ue 

 striis spiralibus gracillimis incremeutique lineis flexuosis ornati ; 

 sutura undulata, aliquanto incrassata ; apertura angusta, longi- 

 tudinis testae ad ^ sequans ; labrum tenue, margine crenulatum, 

 intus laeve, superne paululum infra suturam late profundeque 

 incisum ; columella subrecta, callo tenui induta, tuberculo parvo 

 juxta suturam munita; canalis latiueculus, leviter recurvus. 



Long, 43 mill., diam. 11. 



Hah. Moluccas and Cliina. 



