20 PROCEEDINGS OP THE ACADEMY OF 



tact, the body whorl disproportionately enlarged, the aperture effuse and the 

 general aspect that of Loxonema ; but the condition of the specimens renders 

 it unsafe to undertake to decide on specific or even generic characters. 



The general appearance of this species is like that of M. bilineata, Goldf. 

 (Petr. Germ. iii. 24, Taf. cixxii. 1,) but the four carina? below the band 

 render it easily distinguishable. The casts recall Turritella obsoleta, Sow. 

 from the old red sandstone of Felindre. 



Mdecuisonia neglecta, n. sp. Shell of moderate size, turreted, with an 

 apical angle of 12. Suture impressed, whorls convex, slightly flattened above 

 the middle, bearing a bilinear band below the middle close to the suture. 

 Surface marked by faint, transverse, sinuous striae, which, on the outer por- 

 tion of the body whorl, appear to assume the character of transverse wrinkles. 



Described from a defective specimen, but the bicristate band on the lower 

 side of the whorls is sufficient evidence of its distinctness. It seems to have 

 consisted of 8 to 10 whorls. 



Mcechisonia Shumaediana, n. sp. Shell small, conical, consisting of six or 

 seven gradually enlarging whorls, somewhat flattened on the base and outer 

 surface, so as to leave but a shallow suture ; body whorl obtusely angulated 

 at the junction of the basal and lateral surfaces; aperture broadly cuneate- 

 ovate, angulated behind, scarcely effuse in front ; plane of aperture parallel 

 with vertical axis of shell. Surface of cast quite smooth. 



Height of shell -57 (100) ; height of last whorl -24 (42) ; diameter of base 

 of shell -28 (49) ; length of aperture -23 (40) ; greatest width -17 (30) ; 

 apical angle 34. 



Much resembles the young of M. prolixa, W. and W. It differs in more 

 rapidly enlarging whorls, larger apicial angle and the obtuse angulation limit- 

 ing the basal surface. 



STRAPAEOLLUS, Montfort. 



Steapabollus Baeeisi, n. sp. Shell of medium size, depressed-turbinate ; 

 whorls four or five in number, moderately impressed, rather gradually en- 

 larging to the last, which enlarges somewhat rapidly ; surface generally con- 

 vex, with three rounded, barely perceptible angulations. the first near the 

 somewhat channelled suture, the second along the periphery, and the third at 

 the brink of the medium-sized umbilical cavity. Base of the body whorl some- 

 times slightly flattened, giving an increased transverse diameter to the section, 

 a feature which is associated with a somewhat greater depression of the 

 spire. 



Diameter of one of the largest specimens -96(100) ; height '67 (69) ; height 

 of body whorl *46 (48) ; transverse diameter of body whorl near aperture 

 38 (40) ; approximate diameter of umbilicus *29 (30) ; spiral angle 100. 



This somewhat resembles a species in the Burlington limestone, but the 

 spire is somewhat more elevated, the suture deeper and the whorls are less 

 rapidly enlarged. 



Steapaeollus maceomphalus, n. sp. Shell of moderate size ; spire little 

 elevated ; whorls barely in contact, graduallly enlarging, with a nearly circular 

 section, and circumscribing a broad dish-like umbilical cavity, open to the 

 apex of the spire. Surface of the whorls marked by distinct regular striae of 

 growth, which arch slightly backward in descending the umbilical cavity, and 

 terminate with a slight forward curvature. 



Diameter of shell *84 (100) ; transverse diameter of body whorl near aper- 

 ture -25 (30). 



A close analogue of some forms of Euornphalus lavis, d'Arch. and Vern., and 



can only be distinguished by its wider umbilicus and slightly sigmoid stria? on 



the base of the body whorl. Straparollus costellatus, McCoy, (Pal. Foss., 538, 



pi. 3 H. fig. 3,) is a closely-related form, but differs in some of its surface 



. markings and its larger number of whorls. 



[Jan. 



