532 H. L. Hawkinn—Tho Species of Cidan's 



that characterizes a local deposit in England to occur also in India, 

 and I am inclined to agree with Lambert (1892) that the identification 

 is incorrect. 



(PLATE XXV.) 



4. Rkdescription of C faringdonensis, Wright. 



After these discussions it is possible to proceed to the diagnosis and 

 description of Wright's species, followed by a similar treatment of 

 the second type of Faringdon Cidaris. The synonymic list for the 

 former includes all the references of a probably correct nature that 

 I have been able to find. 



Cidaris faringdonensis, Wright (1864), 1868. 

 Synonymy. 



1854. Cidaris sp., Sharpe, Quart. Journ. Geol. See, vol. x, p. 194. 

 1858. C. coronatus, Etheridge, Geol. Surv. Mem., Sheet 34, p. 32. 

 1861. Cidaris sp., Etheridge. 

 1864. [C. farringdonensis'], Wright, Brit. Cret. Ech., Palseont. Soc, 



vol. i, pt. i, pi. ii, figs. 6-8. 

 1868. C. farringdonensis, Wright, loe. cit., pt. ii, pp. 68, 69. 

 1871. C. faringdonensis, Phillips, Geol. Oxford, p. 433, pi. xvii, fig. 5. 



1874. C" ,, Davey, The Sponge Gravels of Faringdon. 



1875. C. ,, Quenstedt, Petref.Deutsch., Echiniden,p. 179. 



1877. C. ,, Davey, Cat. Foss. Cret. Berkshire. 



1878. C. cf. ,, Barrois, Mem. Terr. cret. Ardennes. 

 1883. C. ,, Keeping, Fossils of Upware, p. 135. 



1900. C. ,, Hesse, N. Jahrb. Min., Beil. Bd., xiii, p. 235. 



1905. C. ,, Davey, Neocom. foss. Faringdon, p. 31. 



1909. C. ,, Treacher, Proc. Geol. Assoc., vol. xxi, p. 119. 



? 1863. C. salevensis, 'Desor,' De Loriol, Neocom. moy. Mont. Saleve. 

 Non 1873. C. farringdonensis, De Loriol, Ech. Helvet., pt. ii, p. 51, pi. in, 



figs. 31-5. 

 Nee 1873. C. farringdonensis, Stolitzka, Pal. Indica, Cret. Fauna, iv, 



p. 49, pi. vii, figs. 29, 30. 

 Nee 1892. Goniocidaris farringdonensis, Lambert, Bull. Soc. geol. France, 

 ser. in, vol. XX, p. 39, pi. ii, figs. 3-12. 



Diagnosis: Test, var. ti/pica, nov. — Form unknown, probably large 

 and considerably elevated. Ambulacra about one-sixth the width of 

 the interainbulacra, with two perradiad rows of prominent granules 

 -which rarely, even at the ambitus, enclose scattered smaller granules. 

 Interambulacral plates thick ; scrobicules circular, covering most of 

 the plate-surface; bosses wholly or partially crenelated; mamelons 

 large, perforated. Scrobicular circle of (usually thirteen) prominent 

 secondary tubercles, separated by spaces wider than their diameters; 

 with an outer, alternating, ring of tertiaries. Miliaries coarse, often 

 only present towards the plate-angles. 



Var. maxima, nov. — Similar to var. typica, but always of large size, 

 with broad interambulacral miliary zones, in which the miliaries are 

 closely packed, without apparent order. 



Radioles. — Exceedingly long, cylindrical. Stem covered with 

 longitudinal rows of small, partially confluent granules, of which 

 alternate rows persist to tlie distal end, become carinate, and terminate 

 in a slight corolla. Subsidiary granule rows often appear between 



