820 



MISS MCDOyALD A>^D DE. TEUEMAls^ OX [vol. Ixxvii, 



Fig. 10. — Procerithium sub- 

 fistulosum (Tate) x2. 



Holotype (?) : A specimen in the Tate Collection, Museum of Practical 

 Geology, Jermyn Street, London (No. 7964) is probably the holotype, but the 

 locality does not agree with those mentioned by Tate (see below). 



This form somewhat resembles those referred to P. cf. vendceense; 



but it differs in its greater size and in its convex subcarinate whorl. 



The apical whorls are not preserved in the holot3^pe, so its 



development cannot be described. 

 Each whorl present is ornamented 

 by three prominent spirals, un- 

 equally spaced, the second forming 

 a carina anteriorly. The suture 

 is deep, and immediately above it 

 on each whorl there is a fine spiral 

 thread. The spirals are crossed by 

 coarse widely-spaced folds, which 

 rapidly become feebler and are 

 scarcely visible on the last whorl. 

 The oral margin is not clear, but it 

 is probably oval. 



This species resembles to some 

 extent P. cf, vendceense in its 

 slender form, three main spirals, 

 and gradual loss of axial ornament. 

 Notwithstanding this fact, the dif- 

 ferences in shape of the whorl 

 suggest that the form now described 

 belongs to a different line of descent. It may be related to 

 ProceritJiutm trinodulosum (Martin).^ 



Locality and horizon. — The specimen described is from the 

 Lower Lias of Redmile (Lincolnshire), and is preserved in the 

 Tate Collection, Museum of Practical Geology, No. 7964. Ralph 

 Tate, in his original description, states that his specimen was 

 from the Marlstone of Lincolnshire. This species is also recorded 

 from the semicostatus zone of Redmile. ^ 



Procerithiitm TEXuiORiN'ATTJM, sp. nov. (Tcxt-fig. 11, p. 321.) 



Cf. Chemnitziafoveolata Tate (24, p. 353 & pi. ix, fig. 12). 

 Cf. Turritella sp. (16, pi. xv, fig. 1). 



Dimensions of holotype. 



Length. 

 12o mm 



JBreadtli. Length of spire. 



30 per cent. 72 per cent. 



Holotype : A specimen in Mr. L. Richardson's collection, L.G. 63. 



Spiral 



Sutural 



angle. 



angle. 



24° 



105° 



A slender gastropod, with rather flat or slightly convex whorls 

 and very fine ornament, consisting of numerous spirals crossed by 



1 10, PL ii, figs. 15 & 16. 



" C. Fox-Strangways, ' The G-eology of the Country near Leicester ' Mem. 

 Geol. Surv. 1903, p. 106. 



