356 F. B. Cowjper Reed — Salterns Undescvibed 8pecies. 



Measurements. 



mm. 

 Diameter of larger specimen 35 



Diameter of smaller specimen ... ... >.. ... 22 



Pleurotomaria uniformis, Salter. (PI. XV, Fig. 3.) 



1873. Fleurotoniaria uniformis, Salter, n.sp. : Cat. Camb. Sil. Foss. Woodw. 

 Mus., p. 155 [a 879). 



Salter {loc. cit. supra) described this species as " large, quite 

 without ridges except band." His original specimen [a 879), from 

 the Fletcher Collection, is the only one which we possess, and it is 

 poor material on which to base a new species, as it is distorted and 

 the shell mostly missing. It was found in the Wenlock Limestone 

 of Dudley, and measures approximately 65 mm. in length and 60 mm. 

 in width across the body-whorl. 



Diagnosis. — Shell large, broadly conical, of few whorls (the three 

 upper ones are alone preserved). Whorls convex, with apical face 

 oblique to axis and having its surface slightly raised in the middle 

 between the suture-line and slit-band. Slit-band of moderate width, 

 marginal, separating apical face from convex portion of whorl below, 

 and situated above the middle line of the whorl ; with rounded 

 prominent borders, and with a convex surface crossed by transverse 

 crescentic strice and occasionally by thicker lamellse. Suture-line 

 shallow. Body-whorl large, apparently nearly half the length of 

 shell. Ornamentation of apical face of whorls consisting of trans- 

 verse sigmoidal lines ; rest of whorls crossed by transverse non- 

 sigmoidal stria3, with a few thicker strige interspersed at irregular 

 intervals. 



Pleurotomaria? helicoides, Salter. 



1873. Flatyschisma helicoides, Salter : Cat. Camb. Sil. Foss. "Woodw. Mus., p. 186 



[b 140, c26). 

 1891. Flatyschisma helicoides, "Woods: Cat. Type Foss. Woodw. Mus., p. 111. 



The two specimens on which Salter founded this species are both 

 from the Upper Ludlow of Lesmahagow. Neither is at all well 

 preserved, and but very few characters are visible. Salter says of 

 this species : "A shell very like the Trochus helicites of the British 

 Ludlows, but flatter and having a marked subangular band." 



Diagnosis. — Shell small, coiled into a low spiral of five or six 

 whorls. Whorls angulated ; apical surface narrow, flat, horizontal, 

 with elevated keel round edge ; sides steeply sloping. Margin of 

 last whorl appears to be expanded into horizontal lamellar band. 

 No slit-band visible. Surface ornamentation unknown. 



Measurements. 



mm. 



Height 2-5 



Width 7-0 



Remarks. — As Salter remarks, this species is quite distinct from 

 Sowerby's Trochus [_PlatyscMsmaJi helicites,^ but it is unfortunate 



1 Sil. Syst., pp. 603, 706, t. iii, figs, le, 5. Siliu'ia, 4th ed., p. 162, Foss. 26, 

 fig. 9 ; t. xxxiv, fig. 12. 



n 



