204 Ralph Tate — New Liassic Fossils. 



Ammonites acute s, spec, no v. 



„ J Falciferen Ammonit, Quenstedt's Jura, t. 22, f. 31. 

 y "\Am. serpentinus, Beesley, op. cit. p. 10, 1873. 



This species has some resemblance to, but is obviously distinct 

 from, A. serpentinus. No specific name has yet been applied to the 

 species represented by Quenstedt's figure, though one or two authors 

 have sought to include it under certain new species described by 

 them. A. pseudo-radians, Reynes, makes a near approach to it, but 

 the whorls are more embracing in the present species, which I call 

 A. acutus, on account of its sharp, elevated keel. As Sowerby's A. 

 acutus is now recognized as belonging to A. margaritatus, the specific 

 name is free to be re-applied. 



It is not uncommon in the rock -bed of the Middle Lias (Zone of 

 Ammonites spinatus) near Banbury : Quenstedt quotes it from the 

 same horizon in Wurtemberg. 



Patella Beesleti, spec. nov. 



Shell thin, subpellucid, conical ; ornamented with concentric 

 rugose folds, which are finely serrated on the posterior side by radial 

 strige ; the summit is obtuse, and placed at the anterior fourth of the 

 shell ; the base is entire, oval, narrow, and abrupt anteriorly, broad 

 and depressed posteriorly. Diameters 12, and 9-20ths of an inch, 

 height 3-20ths. It is allied to P. Hennocqui, Terqm., from the Lower 

 Lias of Lorraine. 



Zone of Ammonites capricornus, Banbury (spec, unique). 



All the hitherto-known Patellce in the European Lias are from the 

 Lower Lias, and in addition to P. JBeesleyi, another species remains 

 to be added to the Medio-Liassic representatives of the genus ; it is 

 the following : 



Patella gratans, spec. nov. 



Shell ovate, conical, apex acute nearly central ; ornamented with 

 faint radiating lines and concentric squamose costulae ; base flat, 

 margin entire. 



Diameters 7-20ths and 5-5-20ths of an inch ; height 3-20ths. 



Zone of Ammonites spinatus, Uley, Gloucestershire (1 specimen, 

 Coll. Geol. Surv.). 



PuRPTJRINA ARMATA, Spec. nOV. 



Shell conoidal, spire pointed ; whorls subqnadrate, step-like ; orna- 

 mented with thick transverse ribs (12 in the last whorl), subspinous 

 on the keel, and with three thick longitudinal costas on the posterior 

 part, and on the front of each whorl ; base rounded, oblique, with a 

 few prominent concentric folds. 



Length ^ inch, diameter little more than ^ inch. 



P. armata is more conical than the majority of the congeneric 

 forms, but has some affinity with P. Bellona. It is not to be con- 

 founded with P. omatissima, Moore, the only other Liassic species of 

 the genus, as restricted by Deslongchamps, but greatly resembles in 

 shape and ornamentation Brachjtrema Wrightii, Cotteau, of the 

 Middle Oolite. 



Upper Lias, near Banbury (1 example). 



