502 J. W. Gregory and Ethel Currie — 



Figures. — Fig. 2a, an interambulacrum, X 4 dia. Fig. 2b, 

 an ambulacrum, X 4 dia. Fig. 2c, apical disc, X 4 dia. 



Affinities. — C. lorini and C. cloma differ from this species by the 

 absence of the vertical arrangement of the epistroma. In this 

 respect the new species most resembles C. arnaudi Cott. (op. cit., 

 1866, p. 786) from the Lower Senonian of southern France, in which, 

 however, it is less developed. Amongst recently established species 

 C. texafia Whitney from the Buda Limestone, Texas, 1916 (Bull. 

 Amer. Pal., vol. v, pp. 91-3, pi. xx, fig. 2), described as nearly 

 related to C. doma, differs by having more of its lower pores in arcs 

 and its ornamentation of "fine longitudinal undulating ridges". 

 C. mortenseni Lambert (Ann. Univ. Lyon, vol. i, fasc. 30, 1911, p. 176, 

 pi. xvi) is more tubercular, having tubercles on the upper as well as 

 on the lower surface. C. lihanoticus de Lor., 1901 (Notes pour 

 servir Et. Ech., 1901, p. 27 ; cf . R. Fourteau, 1913, Bull. Inst. Egypt, 

 vol. vii, p. 57, pi. vi, fig. 6) closely resembles C. lorini Cott. var. 

 alpina ; but Fourteau's figure shows no sign of the vertical epistroma 

 of C. smellii. 



5. Pyrina orientalis Cotteau & Gauthier, 1895 (op. cit., p. 68, 

 pi. xi, figs. 1-8). De Morgan obtained his specimens from Derre-i- 

 Chahr and Endjir-Kuh. 



Dr. Smellie's specimen from Gilan has the dimensions — length 

 24 mm., breadth 20 mm., height 15 mm. 



6. Echinoconus douvillii Cotteau & Gauthier, 1895 (ibid., 

 p. 70, pi. xi,. figs. 9-13). De Morgan's specimens are from Derre-i- 

 Chahr and Aftab. 



Dr. Smellie collected two specimens (Nos. 5 and 6) : — 



No. 5 shows well the arrangement of the pores near the peristome 

 in oblique triplets (Fig. 3). 



7. Hemiaster parthicus Gauthier, 1902 (ibid., p. 137, pi. xx, 

 figs. 1 and 2). De Morgan's specimen was obtained in Luristan ; 

 the exact locality is unknown. 



In Dr. Smellie's specimen (No. 6d) the dorsal keel is broken, 

 and the apical disc is hidden by the interambulacral areas which 

 have been pressed over it. 



Dimensions. — Length 28 mm., breadth 27 mm., height 18 mm. 



Dr. Smellie has sent with the echinoids a few molluscs which 

 include some young oysters, the Lopha morgani Douville. The 

 brachiopoda include Terebratula hrossardi Th. & Per. 



The age of this fauna is unquestionably Senonian, and apparently 

 Campanian. It corresponds with the fauna of the "echinoid lime- 

 stone " of de Morgan, who placed it in the Mastrichtian, but at 

 the base of that division. The evidence of the echinoids is in favour 

 of the horizon being pre-Mastrichtian, but still Senonian. 



