P L E U R T M A. 



Plate XXVIII. 



Species 246. (Mus. Gray.) 



(Magnified to three times its natural length.) 



Pleurotoma Forthiensis. Pleur. testa pyramOali-db- 

 longd, anfractibus superne subangulatis, longitudinaliter 

 oblique costat is ; basi truncatd ; albidd. 



The Forth Pleurotoma. Shell pyramidally oblong, 

 whorls slightly angulated at the upper part, longitu- 

 dinally obliquely ribbed; base truncated; whitish. 



Reeve, Pro. Zool. Soc., 1845. 



Hab. Frith of Forth ; Gray. 



A small obliquely ribbed species for which I am indebted 

 to Mr. Gray. 



Species 247. (Mus. Cuming.) 

 (Magnified to twice its natural length.) 



Pleurotoma formicaria. Pleur. testa acuminato-ob- 

 longd, longitudinaliter fortUer costatd, interstitiis striis 

 subtiUssimis decussatis ; 'ml us extusque piceo-nigrd. 



The ant-like Pleurotoma. Shell acuminately oblong, 

 longitudinally strongly ribbed, interstices crossed with 

 very fine strise ; pitch-black within and without. 



Sowerby, Pro. Zool. Soc., 1833. 



Hah. Iquiqui, coast of Peru (under stones) ; Cuming. 



An oblong, strongly-ribbed, pitch-black shell. 



Species 248. (Mus. Cuming.) 

 (Magnified to two and a half times its natural length.) 



Pleurotoma attenuata. Pleur. testa fusifornd-oblongd, 

 utrinqm attenuata, lavigatd, longitudinaliter costatd, 

 costis subdistantibus ; pallide flavicante, lineis castanets 

 minutissimis obscure ciugulatd, anfractus idthui parte 

 iuferiori pallide casta m d. 



The attenuated Pleurotoma. Shell fusiformly oblong, 

 attenuated at each end, smooth, longitudinally ribbed, 

 ribs rather distant; pale yellowish, obscurely encircled 

 with very minute chesnut lines', lower part of the last 

 whorl pale chesnut. 



Philippi, Enum. Moll. Sicil. vol. ii. p. ICG. 

 Murex attenuatus, Montagu. 

 Pleurotoma Villiersii, Michaud. 

 Pleurotoma gracilis, Scacchi. 



Murex aciculalus ; Lamarck. 

 Hob. Mediterranean. 



According to Kiener, this is the Murex aciculalus of 

 Lamarck. 



Species 249. (Mus. Gray.) 



(Magnified to two and a half times its natural length.) 

 Pleurotoma Dorvilli.e. Pleur. testa oblongo-turritd, 

 tenuiculd, anfractibus svpeme subangulatis, infra longi- 

 tudinaliter plicatis, et transversim subtilissime. elecato- 

 striatis ; albidd, zona triliiieatu fusccsceate ciugulatd. 

 Dorville's Pleurotoma. Shell oblong-turreted, rather 

 thin, whorls slightly angulated round the upper part, 

 longitudinally plicated and very finely elevately striated 

 beneath ; whitish, encircled with a pale brown tliree- 

 line zone. 

 Gray, MSS. (private cabinet.) 

 Hab. St. Vincents, West Indies ; Guilding. 



A very deKcately engraved turreted species, encircled 

 with a fine three-line zone. 



Species 250. (Mus. Cuming.) 



(Magnified to twice its natural length.) 

 Pleurotoma rava. Pleur. testa sulfusiformi-ovatd. spird 

 acuminato-turritd, anfractibus superne' depressis, infra 

 longitudinaliter costatiset transversim subtil iter UraUs, 

 labro incrassato, sinu amplo ; fuh-d, cos/arum inter- 

 stitiis labrique margine purpureo-rufo tinctis. 

 The tawny Pleurotoma. Shell somewhat fusifonnly 

 ovate, spire acuminately turreted, whorls depressed 

 round the upper part, beneath longitudinally ribbed 

 and transversely finely ridged, lip thickened, sinus 

 large ; fulvous, interstices between the ribs and edge 

 of the bp stained with purple-red. 

 Clavatulu rava, Hinds, Moll. Voy. Sulphur, p. 17. 

 pi. 5. f. 18. 

 Hab. Island of Mindanao, Philippines ; Cuming. 



The sinus of this bttle species is usually wide and deep. 



Species 251. (Mus. Gray.) 

 (Magnified to twice its natural length.) 



Pleurotoma o.uadrifasciata. Pleur. testa pyramidali, 



December 1845. 



