CERATIOCARIS. 7 



Lingula squamiformis beds of the Marwood series, is in the Woodwardian Museum, 

 and a fragmentary specimen from Pilton is in the Porter Collection. 



Remarks. — This fossil has been very fully described and illustrated by my friends 

 Professor Rupert Jones and Dr. H. Woodward in the ' Geological Magazine,' and 

 the reader is referred to that article for further information upon it. 



Affinities. — Professor Rupert Jones describes it as larger and less ovate 

 than E. socialis, Beecher,^ and as differing from the other species described by 

 Whitfield, by Clarke, and by Hall, in having two (instead of one) tuberculate 

 ridges. 



2. Genius — Ceratiocaeis, Salter, 1849. 

 1. Ceratiocaeis? sub-quadeata, n. sp. PL 1, figs. 5, 5 a. 



Description. — Carapace-valve ovate-oblong, gently convex. Dorsal and ventral 

 margins gently arching. Anterior margin broad, truncated, with an ogee contour, 

 rounded at the extremities. Posterior margin broad, elliptical. Ventral margin 

 with a strong double rim, vanishing at its extremities. Surface, as seen from the 

 mould, with a few very minute threads or lines arching from the ventral margin 

 over the shell, with the antero-superior corner as a focus. 



Size. — Length 19 mm., height 13 mm. 



Locality. — Two or three specimens on one slab are in my collection from Bast 

 Anstey station. 



BemarJcs. — These fossils are in poor preservation, and it is difficult to discern 

 their true nature. It is my strong impression that they are crustacean, and will 

 probably prove to belong either to Saccocaris or a kindred genus. The ornament 

 is not unlike that of a Lamellibranch, but several points seem decisive against 

 such an explanation, while somewhat similar markings are seen in Estheria. 



Though the ogee shape of the one end agrees with one end of Geratiocaris, 

 the valve appears shorter and more truncate than usual ; while the threads 

 on the surface take a different direction from the characteristic longitudinal 

 lineation of that group, with which for the present I have provisionally left it. 



Affinities. — In general outline it somewhat approaches G. stygia, Salter ^ ; 

 while G. inornata, M'Coy,^ though longer and more angular has several points of 



1 1888, Hall, ' Pal. N. T.,' vol. vii, p. 174, pi. xxx, figs. 1—12. 



2 1888, Jones and Woodward, ' Mon. Brit. Pal. Phyllop.,' p. 38, pi. x, figs. 7 a, b; pi. xi, figs. I 

 3, and 7 ; pi. xii, figs. 2 a, b. 



s Ibid., p. 48, pi. X, figs. 2, 3, 5. 



