PLATE XIX. 



Page 

 SlPIIONOCEINUS NOBILIS (Hall) 212 



Fig. la. Gutta percha cast made from a natural mould. (After Hall.) 

 U. The quinquepartite infrabasal disk. 

 2a. Internal cast, showing the arrangement of the ambulacra upon the left side. 



(Coll. T. A. Green.) 

 2b. Lateral view of a similar cast, showing their arrangement at the right side. 



(Same collection.) 

 2c. Ventral aspect of another cast. (Same collection.) 



Siphonoceinus aemosus McChesney 211 



3a. Left side of an internal cast ; the anal tube overlying the ambulacra, and 

 passing over to the anterior side of the calyx, being subtegminal to the 

 arm regions. (Same collection.) 



3b. Another specimen, showing the right side of the calyx. (Same collection.) 



3c. Ventral aspect of another cast. (Same collection.) 



Siphonoceinus pentagonus W. and Sp. 213 



4a. The type specimen ; lateral view. (Same collection.) 

 46. Ventral aspect of another specimen. (Same collection.) 



Thysanoceinus inoenatus (Hall) 193 



5. Dorsal aspect of specimen with portions of arms. (Coll. W. and Sp.) 



Htptioceixus typus W. and Sp 201 



6a. Dorsal aspect of the specimen described by Miller as Cyphocrinus Gorbyi. 



(After Miller, drawn with the anal side down.) 

 6b. Lateral view of calyx. (Coll. W. and Sp.) 

 6c. Ventral aspect of calyx. (Same collection.) 



