PLATE XYIII. 



PAGE. 

 Fig. 1. COXULARIA MICRONEMA 316 



la. A side view of a somewliat distorted specimen, imj)erfec.t at both extremities. 



lb. A portion of aiiotlier specimen, from near the aperture, showing that the lip was deeply 

 notched at the angles, and somewhat inflected. 



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

 verse stri.e. 



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

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



Fig. 2. CONULARIA NliWBERRYI 316 



2a. Side view of an imperfect specimen. 

 2b. A portion of the surface magnified. 



Fig. 3. Phillipsia LoDiENsis » 323 



Drfi\\'ing, magnilied about two diameters, from a gutta-percha cast, made in the mould left 

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

 sented in the figure.] 



Fig. 4. SOLENOCARIS STRIGATA 321 



4a. A ca«t apparently of the. interior of a left valve. 



46. A part of the mould of the same in the matrix, showing distinct longitudinal atria-, not 



well defined on the cast of the interior. 

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



Fig- 5. CeRATIOCARIS (COLPOCAKIS) ELYTROIDES 319 



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

 56. A mould or impression left in a concretion by left valve. 



Fig. 6. Cer.\tiocaris (Colpocaeis) Bradleyi 318 



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

 66. The same, of a smaller specimen. 



6c. A part of the luinutely reticulated surface, I'ather highly magnified. 



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

 valves of the same. 



Fig. 7. Arcii.^.ocaris vermiformis 321 



