PLATE 41. 

 Fig. 1. ' 579. 1. HoMocRiNus parvus. ( P^S- ^85.) 



1 a. An individual, natural size, wilh a portion of the column attaclied. 



1 b. Tlie head and arms of anotlier individual. 1 c. The specimen fig. 1 b enlarged. 



1 li. A figure showing the structure and form of plates. 



1 e. A part of one of the arms enlarged. 1 /. A portion of the column of 1 a enlarged. 



Fig. 2, 3. 5S0. 2. HoMocKiNus cylindricus. (Pag. 186.) 



2 a. The body and part of the column, natural size. 2 b. An enlarged portion of the column. 



2 c. The structure, showing the single intercalated plate, and the division of the succeeding scapular plate. 



3 o. The body of an individual somewhat more rotund than the preceding, showing the same general structure. 

 3 b. The base of the specimen which has one of the larger joints adhering, showing the central articulating 



portion, while the outer portion of the face is smooth. 



3 c. A figure showing the structure of the specimen. 



Fig. 4. 581. 1. Glyptoraster brachiattts. (Pag. 187.) 



4 a. The specimen as it appears on the surface of a slab of shale. 



4 6. A part of one of the arms enlarged, showing more distinctly the arrangement of the plates of the arms. 



