322 Mr. E. A. Smith on 



Pleurotoma ( Clathurelld) perinsignis. 



Testa ovato-fusiformis, pallide lutescens, circa anfract. ultimi 

 ineclium linea rufa cincta ; anfractus 8, primi 3 laeves, convexi, 

 cajteri convexi, pauluhim supra medium angulati, costis 10-12 

 teniiibus instructi (in aufr. ultimo versus basim evanidis), et liris 

 spiralibus circiter 5 (in anfr. ultimo 16-20) (suprema ad angulum 

 quam caeterse mnjori), et aliis gracillimis supra angulum sitis, 

 cincti, ubique incrementi lineis elevatis liris transversis decus- 

 santibus ornati ; apertura longitudinis totius | adffiquans ; labrum 

 estus costa ultima iucrassatum, superne leviter sinviatum ; canalis 

 brevis, augustus. 



Long. 7|- mill., diam. 3, 



Hob. Japan ? 



Towards the labnim the ribs gradually become more remote 

 from each other. The raised lines ot growth are conspicuous 

 and cross the spiral lirations, which are thus made minutely 

 subgranulous. 



Pleurotama {Clathurella) gemma. 



Testa oblonga, turrita, alba, costis supra angulum alterne pallide 

 rufis albisque ornata, et circa anfr. ultimi medium zona angusta 

 lufa ornata ; anfract. 7, primi 2 laeves, convexi, caeteri superne 

 decliviter tabulati et angulati, infra angulum plani, costis rectis 

 circiter 14 et liris subvalidis ad 6 (in anfr. ultimo circiter 15) 

 supra costas subnodulosis forte cancellati ; et supra angulum 

 spiraliter striati ; apertura longit. totius ad h sequaus ; labrum 

 incrassatum, superne rotunde sinuatum ; canalis brevissimus, 

 angustus. 



Long. 6 mill., diam. 2. 



Hah. St. Helena, in 40 fathoms. 



The great peculiarity of this species is that the upper end 

 of each alternate rib is of a pale reddish colour. The upper- 

 most of the spiral lirations is a little stronger than the rest, 

 and is situated around the angle of the whorls. 



Pleurotoma [Clathurella) helenensis. 



Testa ovata, turrita, flavescens, anfract. 7, primi 2 Iseves, convexi, 

 tertius convexus, obli(]ue tenuiter costatus, ca'teri superne decli- 

 viter tabulati et angulati, infra angulum plani, costis 13, et liris 

 spiralibus 8-9 alterne maguis parvisque infra angulum sitis (in 

 anfr. ultimo circiter 22, quarum 5-6 circa caudam granosse sunt) 

 instructi, supra angulum spiraliter exiliter striati ; apertura 

 elongata, ovata, longit. totius h paulo minor ; labrum incrassa- 

 tum, superne infra sinum parvum unidentatum ; canalis brevis, 

 truncatus. 



Long. 6 mill., diam. 2. 



Hah. St. Helena. 



