100 FOSSIL ASTEROIDEA. 



Description. — The state of preservation of the fragmentary specimens of this 

 species only allows adequate description of the ossicles of the disc. These are 

 very uniform in character, and only differ from those of Stauranderaster ocellatus 

 in the absence of the truncated summit with madreporiform striations. The 

 largest ossicle measures about mm. in diameter. 



The isolated ossicles figured on PI. XXIX show the characteristic shape of 

 marginal ossicles belonging to the genus Stauranderaster (see p. 120), and assist 

 us in ascribing not only this species, but also S. ocellatus, to which the species is 

 closely allied, to that genus. 



Localitij and Stratigraphical Position. — The specimen presented to the British 

 Museum (Nat. Hist.) by Mr. W. McPherson, is from the Marsupites zone at 

 Brighton. The specimens in the collection of Dr. Blackmore are from 

 Micheldever, Hants (zone of Micraster cor-anguinum) , 



Order— CBYPTOZONIA, Sladen, 188G. 



Family— LINCKIIDM, Perrier, 1875. 



Cryptozonate Asteroidea, with comparatively well-developed marginal plates, 

 always contingent. Disc small, rays long and cylindrical. Abactinal skeleton 

 tessellate. Tegumentary developments granulate, superambulacral plates usually 

 present. Pedicellarias (rarely present) excavate or foraminate. 



Genus— LINCKIA, Nardo, 1834. 



Linckia, Nardo, 1834. De Asteriis, Oken's Isis, p. 717. 



Ophidiastek (pars), Midler and Troschel, 1890. Mouatsber k. preuss. Akad. Wiss. 



Berlin, p. 103. 

 Linckia, Gray, 1841. Ann. Mag. Nat. Hist., vol. vi, p. 284. 



Acalia (sub. gen.), Gray, 1841. Tom. cit,, p. 285. 



Arms more or less cylindrical. Dorsal plates small, not arranged regularly in 

 longitudinal series. Two or three rows of granules on the adambulacral plates. 

 Superambulacral plates present. Papular areas distributed irregularly between 

 the dorsal plates. 



1. Linckia, ? sp. PI. XXVII, figs. 1, 1 a. 



Material. — A distorted specimen, which very probably belongs to the genus 

 Linckia, is preserved in the British Museum (Nat. Hist.) (E. 5055, Capron Coll.). 



