SEELET— OX CHALK GASTEROPOJDS. 



91 



of the shell. The body-whorl is slightly iufiated, and the ribs upon it are wider apart' 

 and relatively less numerous than on the whorl above ; they are crossed by numerous' 

 close, spiral striae. The canal is broken, but the body-whorl could not have been less 

 than twice as long as wide, i. e. half the length of the shell. 



Although the mouth is not seen, the body-whorl, from which the 

 shell is partly removed, shows beyond doubt the lines of growth cha- 

 racteristic of the genus. The " notch " in the lip appears to extend 

 almost, if not quite, to the suture. It is the only species of the 

 genus possessing the area-railing-like ornament, externally more like 

 a Kostellaria. 



FUSTTS TRACHYS (n. Sp.). 



Shell fusiform, rather less than three times as long as wide. Spire elevated, less than 

 half the length of the shell, composed of four or five whorls. Each whorl is twice as 

 wide as high, and banded by two wide, thick, much elevated ribs, the space between 

 which is hollow, aud the spaces above and below become constricted and hollow on ap- 

 proaching the whorls they respectively adjoin. The body-whorl, like those preceding it, 

 attains its greatest width at the band of the second rib. Auterior to this are three other 

 ribs, the more anterior two of which are closer together than the others ; and anterior 

 to these are several very much smaller and closer together. 



The whole shell is marked by close, fine, spiral striae, which, on the 

 smaller whorls, are often crossed by others in the direction of the 

 axis. The mouth is extremely elongated and very narrow, lips being 

 nearly parallel. 



Chemnitzia "Woodwardi (n. sp.).. 



Shell subcylindrical, two and a half times as high as wide, consisting of about seven 

 whorls, which regularly increase in size and are moderately convex. Each whorl is one 

 and three-quarter times as wide as high. The space where the whorls adjoin is concave, 

 and the suture is indistinctly seen. There is no ornament, but a great number of fine, 

 close, spiral striae. 



Tins and some other shells have quite an Oolitic aspect. 



Solarium ornatissimum (n. sp.). 



Depressed, few-whoiied, nearly twice as wide as high ; composed of about four or five 

 whorls, which somewhat rapidly increase in size, and are five times as wide as high. Mar- 

 ginally the whorl is angular, and on the spiral surface there bordered by a narrow concave 

 groove, which is margined on the inner side by an elevated rib. Above and interiorly 

 there is another hollow space less deep and twice as wide, and near to the suture a row of 

 about fifteen large, expanded, tumid, nearly adjacent tubercles. The base is gently con- 

 vex and ornamented by close, spiral strias. The whole of the upper surface is spirally 

 striated, but the strice are very much finer than those of the base ; they are cancellated 

 by equally fine, oblique striae, w r hich are directed backwards from the suture. The mar- 

 ginal groove of the whorl gives to the spire a marked sutural channel. 



This looks very like a Pleurotomaria, but I think it is a Solarium. 



Pteroceras, representative of Fittoni. 

 Shell elongated, about half as wide as high.* Spire less than a third the length of 

 the shell, composed of about four whorls. Each whorl is more than a third as high as 

 wide, and has round its middle a sharp, prominent angle ; the part of the whorl above this 

 is inclined at an angle of 45°, that anterior to it is perpendicular. The inclined part is 



* The specimen, which is broken, is two-thirds as wide as high. 



