Mr. J. Lycett on the Upper Lias of Gloucestershire. 261 



each division has two principal branches with numerous inden- 

 tures. The lateral saddle has two principal portions, of which 

 the outer is the smaller ; the indentures are smaller and less 

 conspicuous than in the dorsal saddle. The accessory saddles 

 are small and simple, almost without indentures. 



Ill-preserved specimens occurred rather abundantly at Hol- 

 comb, associated with A. bifrons and Astarte lurida. My 

 friend Mr. Moore has favoured me with fine specimens from 

 the pale-yellow bed of the Upper Lias at Ilminster, and smaller 

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

 Cynocephala-stage at Nailsworth. 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 gregaria, 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 6 (jths of the length. 

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

 T. compressa. A single fine specimen. 



