ICBTHYODORTTLITES. 
121 
1874. Ccehrhynchus rectus and C. hurt ini, T. C. Winkler. Archiv. Mus. 
Teyler, vol. iii. p. 303. 
1879. Ccelorhynchus rectus, A. de Zigno, Mem. R. IstitA eneto, vol. xxi. 
p. 784, pi. xt. figs. 16-18. 
Type. British Museum. 
The type species, attaining a length of not less than 0*45, with a 
maximum diameter of about 0*015. The superficial longitudinal 
ridges are normally very sharp, their broad and flat appearance in 
many fossils being due to post-mortem abrasion. 
Form. Sf Loc. London Clay: Isle of Sheppey. Bracklesham Beds : 
Sussex. Barton Clay: Hampshire. Middle and Upper Eocene: 
Belgium and Italy. Derived in Red Crag : Suffolk. 
38881. Two portions of spines; London Clay, Sheppey. 
Bowerbank Coll. 
25859. One of the type specimens, much abraded, figured by Dixon, 
op. cit. pi. xi„ fig. 26; Bracklesham. Dixon Coll. 
25729. Four specimens, three showing the distal extremity in which 
the degree of tapering and bluntuess varies considerably; 
Bracklesham. Dixon Coll. 
40276. Fragments ; Bracklesham. Edwards Coll. 
P. 1766-67. Similar specimens ; Bracklesham. Ecjerton Coll. 
P. 5438. Similar specimens ; Bracklesham. 
Presented by P. E. Coombe , Esq., 1888. 
P. 3941. Imperfect spine 0*375 in length, wanting both extremities; 
Bracklesham. Enniskillen Coll. 
30890. Portion of small spine ; Bramshaw. Purchased. 
P. 4304. Fragments; Barton Clay, Barton Cliff. Enniskillen Coll. 
42880. Numerous fragments; Brussels. Van Breda Coll. 
P. 4305. Fragment ; Brussels. Enniskillen Coll. 
43312. Two fragments ; Red Crag, Woodbridge. Whincopp Coll. 
The following specimens are probably portions of the base of large 
examples of C. rectus , but the longitudinal ridges of the first two 
exhibit a certain degree of sinuosity, and they may thus be of the 
form named C. sinuatus by Agassiz (Poiss. Foss. vol. v. pt. i. 1844, 
p. 92), without description :— 
P. 6232. Well-preserved specimen ; London Clay, Isle of Sheppey. 
History unknown. 
