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 

 foi ms 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 2 ^ inches ; the height of the aper- 

 ture is 6 lines, the opposite diameter 10 lines. 



A. falcifei-. 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. 



Belemiiites 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 

 ai-ranged, 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'oths of the length. 

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

 T. comprcssa. A single fine specimen. 



