PLATE XVIII. 



PAGE. 

 Fig. 1. COMULARIA MICRONEMA 316 



la. A side view of a somewhat distorted specimen, imperfect at both extremities. 



1&. A portion of another specimen, from near the aperture, showing that the lip was deeply 

 notched at the angles, and somewhat inflected. 



Ic. A portion of the surface, magnified to show tho crenate character of the very fine trans- 

 verse striae. 



Id. Another portion of the same, from near the aperture, showing how the transverse strisB 

 become double in some cases on particular parts of the shell. 



Fig. 2. CoNULARiA Nkweebryi 316 



2a. Side view of an imperfect specimen. 

 26. A portion of the surface magnified. 



Fig. 3. Phillipsia Lodiensis 323 



Drawing, magmfi.ed about two diameters, from a gutta-percha cast, made in the mould left 

 in a concretion. [The crenated character of the margin of the pygidium is not repre- 

 sented in the figure.] 



Fig. 4. SOLENOCARIS STRIGATA 321 



4a. A cant apparently of the interior of a left valve. 



4b. A pairt of the mould of the same in the matrix, showing distinct longitudinal strise, not 



well defined on the cast of the interior. 

 4c. A cast of the opposite valve of another smaller individual. 



Fig. 5. Ceratiocaris (Colpocaris) elytroides - 319 



5a. An imperfect right carapace valve, as seen in the matrix. 

 5b. A moiud or impression left in a concretion by left valve. 



Fig. 6. Ceratiocaris (Colpocaris) Bradleyi 318 



6a. A matrix or impression of a left valve of a large individual. 

 6b. The same, of a smaller specimen. 



6c. A part of the minutely reticulated surface, rather highlv magnified. 



6d and e. The caudal appendages, probably, of this speclee, found associated with the carapace 

 valves of the same. 



Fig. 7. Arch^ocaris vermiformis 321 



