PLATE XXXV—CoiUiimed. 
DiPTEROOAEIS PES-CERV^. 
Page 202. 
Fig. 20. The type-specimen, natural size, showing- the ante)-ior and posterior clefts and the fine, concentric 
striae. 
Fig. 21. The same enlarged to three diameters, showing the characters more distinctly. 
Chemung group. Bansville, LivingsUm county. 
Fig. 22. A portion of the body-whorl of Groniatites sbmosus, which encloses a small body, beaiing some¬ 
what the proportions of the jjreceding s^jecimen, but differing from it in the shorter anterior and 
jiosterior clefts, the pair of nodes at the anterior extremity, and fi-om all the species of Bis- 
cinocaridcB inthe absence of concenti-ic striae upon the surface. Of all the foj-ms here illus¬ 
trated this is the only example which has been observed in close association with any species 
of cephalopoda. 
Fig. 23. The body in question enlarged to three diameters. 
Portage grouj-). Naples, Ontano county. 
DiPTEROCARIS PENN.aE-DAEDALI. 
Page 200. 
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. 
Poi-tage group. Qajiadice, Ontario county. 
DiPTEROCARIS PrOCNE, 
Page 201. 
Fig. 25. The left ala of the carapace in a flattened condition, the right ala being i-estored in outline. 
Portage group. Canadice, 0?itario cotmty. 
Fig. 26. The entire carapace normally folded, showing the character of the anterior and postei-ior cielts. 
Fig. 27. The same in profile, showing the convexity of the carapace. 
Chemung group. Haskinsville, Steuben county. 
