736 NEW YORK STATE MUSEUM 



The carbonaceous film which we find in the shale is probably but a 

 residuum of a somewhat thicker and more composite test ; for we observe 

 that the numerous shells of linguloid and oboloid brachiopods in the same 

 shales are in exactly the same tenuous condition. The latter are, however, 

 known to have lost their phosphate of lime component. As further, 

 Salter reports that the tests of Caryocaris wrightii are often 

 quite solid for their size and appear to have had a good deal of lime in 

 their composition, it is possible that all these now very tenuous shells are 

 leached out to a considerable degree. 



CARYOCARIS Saltcr. 1863 



The genus Caryocaris was proposed by Salter for small chitinous bodies 

 occurring abundantly in the Skiddaw slates and described by him as 

 follows : 



A long, pod-shaped, bivalved carapace (with distinct hinge pits), 

 rounded anteriorly, subtruncate behind, and with the back and front sub- 

 parallel. The surface is smooth, or Avith only oblique wrinkles near the 

 margins, but with no parallel lines of sculpture. Body ? , telson and 

 appendages ? 



All 1 know of this pretty little Crustacean, an inch long, and rather 

 more than one third of an inch wide, is contained in the above note. 



Only one species, C . wrightii, was described. In a restoration of 

 the same the presence of a short abdomen, with a lanceolate telson and stylet 

 was suggested. Dr Hicks, in 1876 [Qiiar. Jour. Geo]. Soc. 32:138], added 

 the description of another species from the Cambric of Wales. Etheridge, 

 Woodward and Jones have, in the paper cited above, described the genus 

 as one of phyllopod crustaceans of the Palaeozoicum and added that, 

 Avhile they have not observed the abdomen, as restored by Salter, Mr Marr 

 has found, in association with Caryocaris, " some small, slender spines or 

 pointed styles . . . which do not contradict Salter's ideal figure." They 

 also state that the ventral and anterior margins are thickened with a 

 raised rim, while the dorsal margin has no rim, as it has in Salter's 

 figure. The " hinge pits " cited by Salter could not be found by these 

 authors. 



