﻿PROSOBRANCHIATA. 



261 



In all other respects the shells agree 5 and I do not feel any doubt, therefore, as to the 

 accuracy of the identification. 



With the Grignon specimens, I received some from Damery, in which the tubercles 

 are thin and compressed, resembling small, oblique ribs ; they form a variety, probably 

 not known to Deshayes at the date of his work above cited, and therefore not noticed 

 by him. Our English shells present the thick rounded tubercles characteristic of the 

 type, and from which the specific name was taken. 



Size. — My specimens have not attained the size of the French shells ; of the 

 largest the axis is 9-12ths of an inch nearly (18 millim.) ; the diameter 3'5-12ths of an 

 inch nearly (7 millim.). 



Localities. — Stubbington. French Grignon, Parnes, Courtagnon, Damery (fide 

 Des/i.) ; Lattainville (fide Graves). 



No. 182. Pleurotoma nodosaria. F. E. Edwards. Tab. XXIX, fig. 8 a, b. 



P. testa turritd, tuberculo-costatd, spiraliter lineatd .- spir a acuminata, elevatd: anfrac- 

 tibus convexis, ad humeros sub-angulatis ; marginibus posticis depressis, vix canaliculatis, 

 ad suturam lined elevatd cinctis ; ultimo anfractu brevi, antice valde coarctato, in canalem 

 brevem producto ; lineis spiralibus exilibus, proeminentibus, sub-distantibus : aperturd 

 ovata ; labro parum arcuato ; sinu lato, sub-semicircidari, anticd in margine collocato. 



Shell narrow, turreted, ribbed, concentrically lined : spire pointed, produced, 

 much exceeding the last whorl in length : whorls convex on the sides, rather bluntly 

 angulated at the shoulders, and crowned with a row of small, oval-shaped, vertical 

 tubercles, impressed by the concentric lines ; the posterior margins are depressed, very 

 slightly furrowed, almost straight, and bordered round the suture by a single slender 

 raised line ; the spiral lines are slender, very prominent, and rather distant. The last 

 whorl is short, and somewhat suddenly contracted towards the front, and terminates 

 in a short, narrowish canal. The aperture is ovate ; the outer lip slightly arched, and 

 the sinus wide, nearly semicircular, and placed in the very front of the margin. 



I possess but an imperfect specimen of this species, but the characters are so 

 distinct that it appears worthy of being recorded. 



Size. — Axis, 5-12ths of an inch; diameter 2-12ths of an inch. 



Locality. — Southampton. 



No. 183. Pleurotoma undata. Lamk. Tab. XXIX, fig. 11, a, b. 



Pleurotoma undata. Lamk. 1804. Ann. du Mus., vol. hi, p. 169, No. 9. 



— — Lamk. 1822. Hist, nat., &c, vol. vii, p. 99, No. 14. 



— — Desk. 1824-37. Descr. des Coq. foss., &c, vol. ii, p. 456; t. 63, 



figs. 11—13; t. 64, figs. 21—23. 



