PLATE L. 



Page 



Periechocbinus necis (Winch, and Marcy) 524 



Fig. la. Posterior side of an internal cast. (Coll. W. C. Egan.) 

 lb. Ventral aspect of another cast. (Same collection.) 



Peeiechoceinus infelix W. and M 525 



2a. An interior cast in a side view. (Same collection.) 



2b. Ventral aspect of an internal cast. (Same collection.) 



2c. Lateral view of a specimen figured by S. A. Miller as Saccocriiius Egani. 



(Same collection.) 

 2d. Ventral aspect of another cast, figured as S. Egani. (Same collection.) 



Peeiechoceinus oenatus Hall and Whitf 527 



3a. Gutta-percha cast from a mould in the rock, showing surface markings; 



posterior side. (After Hall and Whitfield.) 

 3b. Anterior view of an internal cast. (After Hall and Whitfield.) 



Peeiechoceinus tenxesseensis (Hall) 528 



4. Posterior view of Eoemer's type specimen. (After Kcemer.) 



Peeiechoceinus ubnieobmis (S. A. Miller) 526 



5a. Posterior view of an internal cast. (Coll. W. C. Egan.) 

 5b. Ventral aspect of another cast. (Same collection.) 



Periechocbinus speciosus (Hall) 521 



6a. The type specimen. (After Hall.) 



65. Part of an arm enlarged. (After Hall.) 



Peeiechoceinus maecouanus (Winch, and Marcy) 523 



la. Side view of an internal cast; anal side to the left. (Coll. W. C. Egan.) 

 lb. Anterior view of the dorsal cup. (Same collection.) 



