PLEUROTOMARIA. 67 



recurving in the sinus-band, become straight and perpendicular across the lower 

 part of the whorl. Cast of shell showing signs of a deep sinus at the mouth. 



Size. — Height 10 mm., width 10 mm. 



Localities. — There are five specimens (including a very doubtful cast) in the 

 Barnstaple Athenaeum, from Kingdon's, Shirwell ; two doubtful casts in the 

 Porter Collection, from Pilton ; one in the Woodwardian Museum from Barn- 

 staple ; and a large cast in the Museum of Practical Geology from Braunton Down. 



BemarJcs. — I have long believed that the shells figured by Phillips as PL aspera, 

 Sowerby, included two species, and in 1889 I suggested the name PL distinguenda 

 for those, which specifically differed from Sowerby's type in the Woodwardian 

 Museum. It appears, however, that Tawney in 1873 pre-occupied that name for 

 an Oolitic species, and therefore it requires to be changed. 



With this form, as figured by Phillips, these North Devon fossils closely agree, 

 and I believe them to belong to a well-marked species. Our described specimen 

 retains the upper whorls in a beautiful state of preservation, but its body- whorl is 

 defective. It is distinguished from PL aspera by the spire being more angular or 

 step-shaped, and by the sinus-band being at the shoulder instead of near the lower 

 suture. 



M'Coy^ unites PL aspera to PL inter strialis, Phillips.^ I have compared speci- 

 mens of the latter with the present shell, and believe them to be quite different. 

 In PL interstrialis the whorls are more rounded, the spiral marks are more 

 numerous and different, and there are no nodules in the sinus-band. From the 

 true P. aspera it is still further removed, though in a difierent direction. 



3. Pleueotomaria (G-yroma) aspera, Sovjerbij. Plate VI, figs. 10—13. 



1840. Pleueotomaeia aspeea, Sowerby. Geol. Trana., ser, 2, vol. v, pt. 3, 



pi. liv, fig. 16. 



1841. — — Phillips (pars). Pal. Foss., p. 96, pi. xxxvii. 



figs. 177 c and d, and 177* ? (only) 

 1852. — INTEK8TEIALIS, M'Coy (pars). Brit. Pal. Foss., p. 398. 



r MiNUTA, ~» F. A. Bomer. Beitr. Harzgeb., pt. 2, p. 81. 

 \ MINIMA, / pi. xii, figs. 17 a, b. 



1893. — ASPEBA, Collins. Trans. Eoy. &eol. Soc. Cornwall, 



vol. xi, p. 42. 



Description. — Shell moderately elevated, conical, of almost equal height and 

 width. Apex blunt. Suture rather broad and shallow. Whorls convex, wider 

 than high in section, sloping regularly from the suture in a gentle, convex, oblique 



1 1855, M'Coy, 'Brit. Pal. Poss.,' p. 398. 



2 1836, Phillips, ' Geol. Torks.,' vo). ii, p. 227, pi. xv, figs. 10, 10a. 



