﻿PROSOBRANCHIATA. 



271 



Size. — If the shell were perfect the axis would be about 1 inch and 4-12ths 

 (34 millim.); diameter, 5-12ths of an inch (11 millim. nearly). 



Localities. — Southend, Nuneham. French: Bos d'Arros (fide Rouault. 



Additional Species*. — Subdivision a. Canal elongated. 

 No. 194. Pleurotoma Lehonii. Rouault. Tab. XXXI, fig. 13, a, b. 



Pleueotoma Lehonii. Rouault. 1848. Foss. du Terr. Eocene des Env. de Pau ; (Mem. Soc. 

 • Geol. de France, vol. iii, 2d ser., p. 485, t. 16, fig. 26.) 



P. testa elongato-fusiformi, transversim lineatd, longitudinaliter costellatd: anfractibus 

 convexiusculis ; marginibus posticis declivis, ad suturam leviter crenulalis ; ultimo anfractu 

 spiram in longiludine super anti ; costellis obliquis, angustis ; lineis transversis tenuibus, 

 crebris, sub-regularibus : aperturd ovato-angustd, in canalem longum, angustum, sub-rectum, 

 productd ; sinu lato, sub-trigono, in margine collocato. 



Shell long, narrow, fusiform, longitudinally ribbed, and ornamented with concentric, 

 raised lines ; the spire is moderately produced, not equalling the last whorl in length. 

 The whorls are slightly convex, with rather wide, slanting margins, slightly thickened, 

 and very finely crenulated by the lines of growth along the sutural edge. The 

 longitudinal ribs are rather prominent, narrow, not very distant, oblique, and curved, 

 corresponding with the lines of growth, short in front, barely passing beyond the 

 middle of the whorls, but reaching backwards to the very suture ; the concentric 

 lines extend over the ribs, and are fine, close-set, regular, and nearly equal. The 

 aperture is of a narrow, ovate form, and terminates in front in a long, narrow, and 

 nearly straight canal ; the sinus is wide, sub-trigonal, and placed in the margin. 



The English shells agree so well with the description and figures given by Rouault. 

 that there does not appear to be any reasonable doubt of their identity with the 

 species described by that author. 



Size. — Axis, 7-12ths of an inch, nearly (14 millim.); diameter, 2-12ths of an inch 

 (4 - 5 millim.) 



Localities. — Highgate Archway. French: Bos d'Arros (fide Rouault). 



No. 195. Pleurotoma macrura. F. E. Edwards. Tab. XXXIII, fig. 8. 



P. testa elongato-fusiformi, sub-turritd, longitudinaliter costellatd, omnino concentricc 

 lineatd: spird breviusculd, in longitudine trienlem totius testa vix sup er anti : anfractibm 



* The following three species, Nos. 194, 195, and 196, have been obtained since the publication 

 of the first subdivision of the section distinguished by the sinus being placed in the margin ; they are now 

 added in order that the present monograpli may contain descriptions of all the known English Pkurotomae. 



