F. R. Coicpcr Reed — Salter'' s Undescribed Species. 247 



There is only one specimen of this form in the Museum thu8 

 labelled by Salter (a 861), and it comes from the Wenlock Limestone 

 of Dudley. 



Diagnosis. — Shell discoid ; spire short ; whorls six ? (only three 

 are preserved), angulated slightly by longitudinal keel near margin 

 of flattened apical surface ; sides of whorls ornamented by two weaker, 

 equidistant, longitudinal keels. No keels on umbilical surface. 

 Surface of whoiTs crossed by small, closely-set, transverse growth- 

 lamellge, slightly undulated and irregular, and curving backwards 

 from the mouth outside the inner longitudinal keel of apical surface. 

 Umbilicus not seen. Aperture apparently oblique. Breadth 36 mm. 



Remakks. — There is no feature by which this form can be separated 

 from the variable H. discors, and the species therefore must be 

 dropped. The indentation on the outer whorl of the specimen is 

 manifestly due to an injury to the shell, and cannot be considered 

 as a character of any specific importance. It is not even desirable 

 to separate this form as a definite variety of H. discors, a conclusion 

 I have reached after examining a large series of the latter species. 



Pleurotomaria Fletoheri, Salter. (PL XI, Fig. 4.) 

 1873. Pleurotomaria Fletcheri, Salter : Cat. Camb. Sil. Foss. "Woodw. Mus., 



p. 154 (a 851). 

 1891. Pleurotomaria Fletcheri, "Woods: Cat. Type Foss. "Woodw. Mus., p. 112. 



There is only the one original specimen (a 851) in the Wood- 

 wardian Museum from the Wenlock Limestone of Dudley and 

 belonging to the Fletcher Collection. It is not quite perfect and 

 is slightly compressed laterally, but the shell is preserved on the five 

 whorls. The figure of a Pleurotomaria given by Salter (op. cit. supra, 

 p. 154) in the margin closely resembles this species. 



Diagnosis. — Shell broadly conical; apical angle 50°-60°; whorls six 

 in number (only five are preserved), convex, with slit-band grooving 

 middle of body-whorl, but situated below middle line of other whorls 

 though above suture-line. Two weak longitudinal keels, of which 

 the lower is the stronger, are present on apical surface of body-whorl 

 above slit-band at equal distances between it and suture-line. On 

 the upper whorls the keel nearer the slit-band is more prominent 

 and slightly angulates the apical surface of the whorl, but the other 

 keel nearer the suture-line is almost obsolete. Slit-band concave 

 and sunken as a groove between sharp, prominent, narrow borders ; 

 crescents fine, closely packed, sharply curved. Ornamentation of 

 apical surface consists of obliquely transverse, slightly sigmoidal 

 striae, and wrinkles bending back sharply near the slit-band to meet 

 it as an acute angle. The ornamentation below the slit-band is 

 similar, the strise being sharply curved back to meet it. Aperture 

 not preserved. Height of specimen ca. 45 mm. 



Remarks. — The broadly conical shape of the shell and the position 

 of the slit-band on the whorls, as well as its groove-like nature, 

 are features found also in PL bifortnis (Lindstrom),^ but the orna- 

 mentation of the surface is quite distinct, and only one keel is figured 

 in that species above the slit-band. 



^ Lindstrom: op. cit., p. 98, pi. vii, figs. 39-42. 



