GRAPTOLITES OF NEW YORK,' PART 1 735 



ADDENDUM 

 CARYocARis Saltci" and dawsonia Nicholson 



Associated witli the graptolites of the Deep kill and Noi-manskill beds, 

 we have found numerous small variousl}- shaped bodies Avhich consist of a 

 substance that is similar to, but as a rule, more tenuous than that of the 

 graptolites. For one group of these bodies the generic term, Caryocaris, has 

 been proposed by Salter [1863, p. 139], for another that of Dawsonia by 

 Nicholson [1873, p.l39]. The former wei'e considered ci-ustaoeans, the latter 

 "ovarian capsules" (" grapto-gonophores ") of graptolites. Gurley [1896, 

 p.85ff] has maintained that both are graptolites. As, at least, in regard to 

 one group, the Dawsonias, our material tends to verify his observations, we 

 have appended here the descriptions of the representatives of both groups 

 occurring in the lower graptolite beds ; but wish it understood that we con- 

 sider their taxonomic position not yet determined. 



The substance and texture of the test of all these forms is one of their 

 characteristic features by Avhich they can be readily recognized. It is 

 apparently of a chitineus nature, but mostly thinner than that of the 

 graptolites, of less luster, possessing often a light purplish tint, also observed 

 by Etheridge, Woodward and Jones^ in regard to Caryocaris 

 wrightii, and above all an extremely delicate, irregular corrugation or 

 wrinkling, the wrinkles often assuming the ajipearance of scales or regulai-ly 

 overlapping tiles [pi- 17, fig.l7]. This corrugation, which is never found so 

 strongly developed on the periderm of the graptolites, is an indication of 

 the thinness and flaccidity of the test of the forms under discussion. It 

 often appeal's like a shriveling, but is in most cases clearly superin- 

 duced by the incipient and minute cleavage or slipping of the rock. Its 

 character is indicated on the figures, which also show that the wrinkles 

 cross the specimens in no definite direction, but that the latter depends 

 entirely on the accidental position of the specimens to the cleavage planes in 

 the rock. 



iRep't of the Committee on the Fossil Phyllopodaof the Palaeozoic Rocks. 1883, p.7. 



