GRAPTOLITES OF NEW YORK, PART 2 487 



are held to be nothing but the detached lateral appendages of another 

 species (C . c u r v i 1 a t u s) . 



In looking over the suite from Pinon range with this conception of 

 Caryocaris in mind, one can not help noticing the disproportion in size 

 between the supposed complete bodies and the detached appendages. As 

 the drawings in natural size, given here [text fig. 472-81] show, the winged 

 bodies are throughout of much smaller size than the mostly quite stately 

 " appendages" ; their proportion is about what one would expect to be that 

 of the abdomen to the carapace. In a careful scrutiny of the winged bodies 

 the latter turned out to consist of an abdomen showing, when complete, 

 three somites and three caudal spines [479-81]. 



Jones and Woodward have figured a specimen received from Malaise, 



in which a trifid tail extends from below the narrow extremity of the carapace 



[see text fig. 482] showing the cercopods. Of these it is stated : 



They are not wholly exposed, but evidently comprise three lancet- 

 shaped, flat, thin, bladelike members, one of which, apparently larger than 

 the others, as far as they are exposed, may be the style or chief cercopod. 

 We do not know any set of style and stylets exactly corresponding to these. 



A comparison of our figures of the cercopods with that given by Jones 

 and Woodward shows the great similarity in shape of the two broad and fiat 

 lateral cercopods while the style or telson in our form is relatively shorter 

 and more acute. The cercopods possess a stronger axis than the style. 

 This mostly appears along the outer margin and probably corresponds to 

 the spinelike caudal appendages observed in most phyllopods, bearing here 

 a bladelike extension. 1 Cases of actual connection of the abdomen with 



1 Jones and Woodward cite several forms with similar caudal appendages, among the 

 Elymocarids. The caudal appendages of Elymocaris siliqua from the Chemung 

 group in Pennsylvania bear indeed a close resemblance to those of this Caryocaris. The 

 telson is described by Dr Clarke [Pal. N. Y. 7: 183] as "short and stout and bearing a con- 

 spicuous median ridge " and the cercopods as " flat, comparatively narrow and longer than 

 the telson, and (are) minutely crenulated along their inner edges for the attachment of 

 setae." The setae of the cercopods, observed in Elymocaris and other phyllocarids are 

 also distinct on the inner margins of the caudal appendages of C . w r i g h t i i [see fig. 479], 

 and already brought out in Gurley's figure [see text fig. 471]. 



