CARYOCARIS WRIGHTII. 89 



VIII. Genus — Cartocaeis, Salter, 1863. 



Saltee, ' Quart. Journ. Geol. Soc.,' vol. xis, 1863, pp. 135, 139. 



BiGSBT, ' Thesaur. Silur.,' 1868, p. 73. 



T. E. Jones, ' Geol. Mag.,' 1883, p. 463. 



T. E. Jones and H. Woodwaed, 'Eeport Brit. Assoc, for 1883 ' (1884), pp. 217 and 221. 



— — ' Monogr. Brit. Pal. Phyllop.,' pt. 1, 1888, p. 3. 



Etheeidge, ' Foss. Brit.,' vol. i, Palssoz., 1888, p. 46. 



Mr. J. W. Salter determined Garijocaris (' Quart. Journ. Geol. Soc.,' vol. xix, 

 p. 139) as having a " bivalved carapace (with distinct hinge-pits), rounded 

 anteriorly, subtruncate behind, and with the back and front subparallel. The 

 surface is smooth, or with only oblique wrinkles near the margins, but with no 

 parallel lines of sculpture." The body and abdominal appendages were unknown 

 to Mr. Salter ; but he suggested, in a restoration (' Quart. Journ. Geol. Soc.,' 

 vol. xix, p. 137, fig. 15), a strong, tapering telson (or last body-segment), carrying 

 a sharply lanceolate style and stylet, much like fig. 16 a, PI. XI of this Monograph 

 (Part I, 1888). Mr. Marr has found in association with Garyocaris, at the 

 tramway bridge crossing the Seiont in Caernarvonshire, some small slender spines 

 or pointed styles, from about A to ^ inch in length, which are longer than 

 Salter's ideal figure ; but Prof. Malaise, of Gemboux, Belgium, has favoured us 

 with the loan of a specimen showing three definite sharp dagger-like stylets 

 as the cercopods of this genus (see the figure at p. 91). 



1. Cakyocaeis Wbightii, Salter, 1863. Plate XIV, figs. 11—15; and Figures 



5 and 6 (woodcuts). 



Caetocaeis Weightii, Salter. Quart. Journ. Geol. Soc, vol. xix, 1863, pp. 137, 



135, fig. 15, and p. 139. 

 _ _ — Catal. Cambr. Silur. Foss. Cambridge, 1873, 



p. 21, vroodcut. 

 _ _ £-. Woodward. Catal. Brit. Foss. Crustac, 1877, p. 70. 



_ — H. N. and E. Catal. Camb. Silur. Foss. Mus. Pract. Geol., 



1878, p. 19. 

 _ — T. B. J. and H. W. Eeport Brit. Assoc, for 1883 (1884), 



p. 222. 

 — Etheridge. Foss. Brit., vol. i, Palaeoz., 1888, p. 46. 



The test is smooth, thick, and somewhat horny in appearance, often with light 

 purpUsh tints, sometimes black and filmy, rarely white and thick (fig. 12). The 

 ventral margin is thickened with a raised rim ; and sometimes the appearance of 



12 



