PLATE XXXV— Continued. 



DlPTEROCARIS PES-CERV^. 



Page '-»o:. 



Fig-. 20. The type-specimen, natural size, showing the anterior and posterior clefts and the tine, concentric 



stria-. 



Fig. 21. The same enlarged to three diameters, showing the characters more distinctly. 

 Chemung group. Dansvilh . Livingston county. 



Fig. •!■!. A. portion of the body-whorl of Gfoniatites sinuosus, which encloses a small body, bearing some- 

 what the proportions of the preceding sj imen, but differing from it in the shorter anterior and 



posterior clefts, the pair of nodes at the anterior extremity, and from all the species of Dis- 

 cinocaridcB inthe absence of concentric striae upon the surface. Of all the forms here illus- 

 trated this is the only example which has 1 n observed in close association with any species 



of cephalopoda. 



1-" i tr . 23. The body in question enlarged to three diameters. 

 Portage group. Naples, Ontario county. 



DlPTEROCARIS FENN-E-D-SDALI. 



Page 'J00. 

 Fig. 24. The type specimen of this species, showing the left ala of the carapace. The remainder of the 

 carapace is restored in outline, indicating the relative proportions of the anterior and posterior 

 clefts. 



Portage group. Canadice, Ontario county. 



DlPTEROCARIS PROCNE. 

 Page 201. 

 Fig. 25. The left ala of the carapace in a flattened condition, the right ala being restored in outline. 



Portage group. Canadice, Ontario county. 

 Pig. 26. The entire carapace normally folded, showing the character of the anterior and posterior clefts. 

 Fig. 27. The same in profile, showing the convexity of the carapace. 

 Chemung group. SasMnsville, Steuben county. 



