Mr. J. Lycett on the Upper Lias of Gloucestershire. 161 



forms of the same species occur in the lower shelly zone of the 

 Cynocephala-stage at Nails worth. The largest specimen in my 

 possession has a diameter of 2J inches ; the height of the aper- 

 ture is 6 lines, the opposite diameter 10 lines. 



A.falcifer. A few specimens. At Stroud, when the railway 

 was being constructed, a thin band of pale grey limestone was 

 crowded with fine specimens, to the exclusion of all other species. 



A. annulatus, Sow. Few, and ill-preserved. 



A. Lythensis, Y. & B. Smaller forms than occur at Whitby. 

 It is not the A. Lythensis of Quenstedt ; the latter is a very 

 different Ammonite. 



Belemnites compressus, Voltz. Large specimens in the upper 

 bed, associated with B. tripartitus. 



B. tripartitus, Schl., agrees with specimens in the Cynocephala- 

 stage at Nailsworth and at Frocester Hill. 



Nautilus latidorsatus, D'Orb. (N. Toarcensis, D'Orb. ; N. Ju- 

 rensis, Quenst.). A single fine specimen. 



N. sinuatus, Sow. Fragments only. 



Pleurotomaria. Species undetermined, with elevated spire, 

 narrow convex volutions, mesial siphonal rib, and fine, densely 

 arranged, equal encircling lines. 



Turbo capitaneus, Miinst. Its aspect agrees with specimens 

 from the Cynocephala-stage in the neatness of the ornamen- 

 tation. 



Gresslya gr eg aria, Roem. A large tumid species, well sepa- 

 rated from congeneric forms. A single specimen. 



Tancredia laviuscula, n. sp. 



A large elongated species, with an oblique dorsal angle and 

 the posterior border nearly closed. Compared with allied forms, 

 it is more lengthened and less convex than T. donaciformis ; the 

 anterior extremity is more rounded; the umbo is but little 

 elevated, the posterior side being much extended and its extre- 

 mity pointed ; the height being only equal to y^ths of the length. 

 It is distinguished by the same features from T. Deshayesea and 

 T. cowpressa. A single fine specimen. 



Lima gigantea, Sow. This well-known shell occurs both in 

 the Lower and Upper Lias of Gloucestershire. D'Orbigny has 

 separated the older form under the name of L. edulis. I do not 

 perceive that the latter possesses any sufficient specific distinction. 



Lima bellula, Mor. & Lye. Delicately preserved, and exhi- 

 bit ing the finely ornamented surface, which is rarely seen in 

 Inferior Oolite specimens. Some of the latter attain larger 

 dimensions and have a somewhat shorter figure, but do not 

 possess any other distinguishing feature. 



