PLEUROTOMA.— Plate XIX. 



spire, longitudinally ribbed, transversely striated, 



stria; elevated, alternate ones rather the larger ; 



aperture lanceolately ovate; canal rather long, 



straight. 

 Forbes, Pro. Zool. Soc, 1844. 

 Hab. Cape Artimesium, coast of Asia Minor (dredged 



from the depth of eighty fathoms) ; Forbes. 



The spire of this shell is unusually short. 



Species 161. (Mus. Forbes.) 



Pleurotoma teres. Pleur. testd elongato-fusiformi, 

 spird acuminata ; anfractibus rotundis, teretibus, ad 

 suturam complanatis, spiraliter costatis, costis Itevi- 

 bus, prominentibus , interstiliis striata- cancellatis ; ca- 

 nali elongate, graci/i. 



The TArERiNG Pleurotoma. Shell elongately fusiform, 

 spire acuminated ; whorls round, tapering, smooth 

 at the suture, spirally ribbed, ribs smooth, promi- 

 nent, interstices cancellated with striae ; canal long. 



Forbes, Pro. Zool. Soc, 1S44. 



Hab. Gulf of Macri, coast of Lycia, Asia Minor ; and 

 island of Paros, Grecian Archipelago (dredged at 

 the depth of about forty-five fathoms) ; Forbes. 



A very elegantly formed shell, remarkable for the ta- 

 pering regularity of the spiral ribs. 



Species 162. (Mus. Macgillivray.) 



Pleurotoma turricula. Pleur. testa oblongo-fusiformi, 

 turritd, alba ; anfractibus superne acutangulis, longi- 

 tudinaliter costatis, costis adangulum nodulosis, trans- 

 versim siibtilissime elevato-striatis ; aperturd subquad- 

 rato-oblongd, canali breviusculo ; sinu subindistincto . 



The little tower Pleurotoma. Shell oblong-fusi- 

 form, turreted, white ; whorls sharply angled round 

 the upper part, longitudinally ribbed, ribs nodulous 

 on the angle, transversely very finely striated, stria; 

 raised ; aperture rather squarely oblong, canal rather 

 short ; sinus somewhat indistinct. 



Macgillivray, Moll. Aberdeen, p. 172. 



Murex turriculus, Montague, Test. Brit., pi. 9.f. 1. 

 lusus turriculus, Fleming. 



Hab. Coast of Aberdeen, North Britain (found on hard 

 ground in deep water) ; Macgillivray. 



The sinus of this shell is so indistinct, that I was for 

 some time doubtful as to the propriety of inserting it in 

 the genus Pleurotoma. 



gerrimo-fuscd ; anfractibus turgidis, longitudinaliter 

 costatis, costis fortibus, anfractds ultimi inferne 

 evanidis, transversim siibtilissime striatis ; canali 

 brevi. 



The swollen Pleurotoma. Shell stoutly fusiform, 

 very dark brown ; whorls swollen, longitudinally 

 ribbed, ribs strong, those of the last whorl disap- 

 pearing towards the lower part, transversely very 

 finely striated ; canal short. 



Forbes, Pro. Zool. Soc, 1844. 



Hab. Cape Artimesium, coast of Asia Minor (dredged 

 from the depth of eighty fathoms) ; Forbes. 



This shell may be recognised by the peculiar manner 

 in which the ribs disappear about half-way down the 

 last whorl. 



Species 164. (Mus. Forbes.) 



Pleurotoma .ZEgeensis. Pleur. testd subobeso-fusi- 

 formi, fused; anfractibus convexis, longitudinaliter 

 costatis, costis fortibus, alternatis, transversim stri- 

 atis, striis minutissimis longitudinaliter decussatis; 

 canali brevi. 



The tEgean Pleurotoma. Shell rather stoutly fusi- 

 form brown ; whorls convex, longitudinally ribbed, 

 ribs strong, alternated, transversely striated/crossed 

 with very minute longitudinal stria? ; canal short. 



Forbes, Pro. Zool. Soc, 1844. 



Hab. Bays of the island of Amorgo, Grecian Archipe- 

 lago (dredged at the depth of from ten to twenty 

 fathoms) ; Forbes. 



The minute longitudinal striae cannot well be seen 

 without the assistance of an ordinary lens. 



Species 163. (Mus. Forbes.) 

 Pleurotoma turgida. Pleur. testd obeso-fusiformi, ni- 



Species 165. (Mus. Forbes.) 



Pleurotoma fortis. Pleur. testd acuminato-fusiformi, 

 mediane tumidd, spird peracutd ; anfractibus ventri- 

 cosis, longitudinaliter costatis, costis fortibus, subdi- 

 stantibus, transversim striatis, striis elevatis, alternis 

 majusculis ; canali brevi. 



The strong Pleurotoma. Shell acuminately fusiform, 

 swollen in the middle, spire very sharp-pointed ; 

 whorls ventricose, longitudinally ribbed, ribs strong, 

 rather distant, transversely striated, striae raised, 

 alternate ones rather the larger ; canal short. 



Forbes, Pro. Zool. Soc, 1844. 



Hab. iEgean Sea (dredged at the depth of from seventy 

 to a hundred fathoms) ; Forbes. 



This species may be distinguished by the strong ribs 

 and swollen character of the whorls. 



