300 Mr. E. A. Smith on 



XXXVIII. — Diagnoses of new Species of Flenrotomidoi in the 

 British Museum. By Edgar A. Smith. 



I HAVE already published in these * Annals '* numerous descrip- 

 tions of Pleurotomidfe in the collection of the British Museum. 

 Although it is difficult to recognize the species from the 

 diagnoses alone, through having published names attached to 

 them they become scattered abroad in continental and other 

 collections, and by this means become known. 



Already several of the species previously described have 

 been correctly identified and figured by other writers ; and it 

 is to be hoped that the remainder will sooner or later find their 

 way into illustrated monographs. In this, as in the previous 

 papers, I have adopted the plan of placing all the forms in 

 the comprehensive genus Pieurotoma, at the same time giving 

 in brackets the group or section to which they belong or to 

 which they seem most nearly related. 



Pleurotoma (Surcula) fuegiensis. 



Testa breviter fusiformis, purpureo-rosea, Cauda pallidiorc ornata ; 

 anfract. 7, primi 2, apiceui constitueutcs, magni, Isevcs, rotundi, 

 cseteri supcrne laeves, leviter concavi, iuferne couvexiusculi et 

 costis perobliqiiis ad ] 2 (in anfr. ultimo medio evanidis) instructi ; 

 apertura longit. totius ^ ada^quans ; labrum teuue, superne ad 

 suturam late profundequo siuuatum ; columella in medio leviter 

 arcuata, basi obliqua ; canalis brevis, latus, paululum recurvus. 



Long. W^ mill., diam. 4. 



Hah. Straits of Magellan {Dr. Cunningham). 



The apex of this species is large and obtuse. The oblique 

 ribs are thickest at their upper ends, and below the middle of 

 the body-whorl the purple-pink colour is deepened, forming 

 an obscure spiral band. 



Pleurotoma (Drillia) unifasciata. 



Testa solida, obloiiga, turrita, subrimata, fukescens, circa anfr. 

 ultimum ad periphcriam zona latiuscula fusca ciucta ; anfract. 12, 

 convexi, superne paululum concavi, costis erassis rotuudatis iu- 

 ferne iucrassatis (in anfr. ultimo 7 ad periplieriam obsoletis) in- 

 striicti, transversim teuuiter lirati ; apertura albida, longitudinis 

 totius I adaequans ; columella valdc callosa ; canalis latissimus, 

 brevis ; sinus latissimus, profundus. 



Long. 35 mill., diam. 13. 



* Vol. xix. (1877) pp. 488-501 ; vol. x. (1882) pp. 206-218, 296-306; 

 vol. xiv. (1884) pp. 317-329. 



