Echinoidea from Western Persia. 501 



1. Rhabdocidaris morgani Gauthier, 1902 (Miss. Sci. Perse, 

 vol. iii, pt. iii, p. 145, pi. xx, figs. 3-6). Originally obtained by 

 de Morgan from the Upper Senonian in Luristan ; the exact locality 

 of the type has been lost. Dr. Smellie's specimen is a well-preserved 

 segment from the Lower Senonian Limestone. He also collected 

 an uppermost interambulacral plate. 



2. Cidaris husseini Cotteau & Gauthier, 1895 (ibid., vol. iii, 

 pt. ii, p. 82, pi. xiii, figs. 10-12). This species is based on spines 

 which were obtained by de Morgan at Derre-i-Chahr. Dr. Smellie's 

 collection includes six broken spines. 



3. Salenia cossicea Cotteau & Gauthier, 1895 (ibid., p. 83, 

 pi. xiii, figs. 13-19). Specimens obtained by de Morgan at Derre-i- 

 Chahr, Endjir-Kuh, and Aftab. 



Dr. Smellie's specimen is small and well preserved ; diameter 

 12 mm., height 8 mm. Its characters are illustrated by PI. XII, 

 Figs, la and 16. 



4, Codiojisis smellii n.sp. (Figs. 2a-c.) 



Diagnosis. — Test sub-hemispherical ; base slightly contracted. 

 Horizontal section almost circular but slightly pentagonal. 



Apical disc. — Periproct pentagonal. Each genital plate has a 

 large pore near the outer edge, and a granule near the edge of the 

 periproct. Each ocular plate bears four large granules and lines 

 of small granules, 



Amhidacral areas. — Each pore zone includes 27 pairs of small 

 round pores in a straight vertical series except at the base, where 

 the pairs are in arcs and the pores are smaller and closer. Near 

 the peristome each column has a vertical series of three tubercles 

 which become smaller towards the peristome. The rest of the 

 ambulacral area has very few granules ; each ambital plate has three 

 granules arranged in a triangle. 



Interanibidacral areas. — About three times the width of the 



ambulacral. About eight plates in each column. At the base of 



each column three large tubercles occur in a transverse row ; of 



these the adambulacral tubercle is the largest. The plates are 



ornamented by numerous granules, which are elongated vertically 



and form two parallel vertical broken ridges. Some of the elongated 



granules are perforated. Between the vertical ridges is a row of 



round granules, three in each plate ; the middle granule is the 



largest. Some granules have a distinct mamel on; in others the boss 



consists of a flat topped ring with a central pit. These pitted 



granules probably bore the " mamelons radiolif ormes " of Cotteau 



(Pal. franc., Terr. Cret., Ech., vol. vii, 1866, p. 774). Dimensions: 



Length. Breadth. Height. 



No. 3 . . 12 mm. 1-2 mm. 7 mm. 



No. 4 . . l-3mm. l-25mm. 7mm. 



Distribution. — Collected by Dr. W. E. Smellie at Iman-Hasan, 

 Lower Senonian Limestone. 



