8 



BRITISH FOSSILS. 



The Oolitic species of Echinus are so fully described, and also figured, by Dr. Wright, 

 in the paper above referred to, that it is unnecessary to do more than enumerate them ; 

 the first mentioned, however, has not been yet figured in any British work. 



1. E. gyratus, Agass,, Ech. Suisses, t. 23. f. 43-46., 1839 ; Catal. Raisonne, 1846, 1. c, 

 p. 366. ; Forbes, in Morris's Catalogue, 2nd edit. (1854), 79. E. petallatus, M'Coy, 

 Ann. Nat. Hist., 1848, vol. ii. p. 409. 



E. hiuncialis subconicus, pentagonus, lobatus, tuherculis numerosis — in area ambulacrali ad 

 basin quadrifariisy in altera seriebus sex vel octo — omnibus subequalibus ; spatio mediano 

 interambulacri lato lavigato ; pm'is subparallelis. 



E. petallatus of M'Coy is undoubtedly this species. It is a very elegant one. In all 

 probability Knorr's old figure belongs to it. Leske's certainly represents it far 

 better than it does the E. perlatus. 

 Locality. — Coral Eag. Wiltshire (Brit. Mus.) ; Besangon (Agass.) ; Havre (Brit. Mus.). 



2. E. granularis, Wright, Ann, and M. Nat. Hist. (1851), vol. viii. 2nd ser. p. 277. 



A small species, distinguished from E. perlatus by its depressed and pentagonal 

 form, and its granular appearance, the latter arising from the great number of 

 tubercles, six or eight rows, in the interambulacral area. 



Locality. — Inf. Oolite. Leckhampton Hill (Dr. Wright). 



Of the Section Arbacia. Pores in single file. 

 E. (Arbacia) Forbesii, Wright, 1. c. pi. xiii. f. 4. 



A small hemispheric species, Avith narrow convex ambulacra and interambulacral 

 areas, depressed and almost lobed along the median line, covered by small equal 

 tubercles. 



Locality. — Inf. Oolite. Dundry (Dr. Wright). 

 E. (Arb.) nodulosa, Wright, 1. c. pi. xiii. f. 3. 

 Ech. nodulosus, Goldfuss, Pet. Germ. t. xl. f. 16. 



A subpentagonal small species, covered with thick set tubercles, of larger size than 

 in the last. The ambulacra are prominent. 



Locality, — Great Oolite. Sevenhampton Common, Gloucestershire. 



(Dr. Wright's Collection, Miinster's specimen was found at' Baireuth.) 



Explanation of Plate. 

 Pig. 1. Echinus perlatus, var, germinans ; upper side, with anal disk complete (Malton). 



Cabinet of Prof. Phillips. 

 Pig. 2. The same ; lateral view. 



Pig. 3. Flattened under side, showing the pentagonal deeply-notched mouth. 



Pig. 4. Outline of the large specimens of var. germinans, from the Inferior Oolite of 



Crickley Pfill, Cheltenham. 

 Pig. 4a. Ambulacral and interambulacral plates of this variety, shewing the distinct 



circles of granules round the bosses, the pores in parallel ranks of threes. 

 Pig. 4b. Under side of do., showing the large secondary tubercles, and the pores in 



closer and more transverse rows, with granules among them. 

 Pig. 4"=. Anal plates of a large specimen. 



Pig. 5. Ambulacral and interambulacral plates of var. serialis. The ambulacral 



tubercles very irregular ; magnified. Crickley Hill. 

 Pig. 6. Var. Forbesii, from Crickley Hill. This is evenly covered with granules, the 



primary tubercles therefore are more conspicuous. 

 Pig. e''. Plates and pores of do. magnified, the triple series of pores very obliquely placed. 

 Pig. e^. Anal plates of this variety. The madreporiform plate is not greatly enlarged. 



March 1856. 



J. W. Salter. 



