III. Thenarocrinxts callipygus. 223 



The specimens on which the following description is based 

 are as follows : — 



In the British ^luseura : 



480-49, a perfect specimen from root to crown, seen from 



anterior ; bought of Mr. B. M. Wright. (PI. X. 



fig. 4.) 

 57478 a, crown and 1 inch of stem, seen from R. side, anal 



plates just shown on L. of specimen j bought of Mr. 



S. Allport. (Pi. X. fig. 3.) 

 57478 &, crown and \ inch of stem, seen apparently from L. 



side ; arms broken at postpalmars leave ventral sac 



exposed; bought of Mr. S. Allport. (PI. X. 



fig. 5.) 



In Dudley Museum : 



One specimen ; arms preserved up to postpalmars ; cup 

 crushed ; about 2 inches of stem, somewhat broken j 

 orientation uncertain. (PI. X. fig. 7.) 



In Mason College Museum, Birmingham : 



138, crown and J inch of stem, seen from posterior; arms 

 broken off after postpalmars, showing ^ inch of 

 ventral sac ; rest of sac broken away ; cup frac- 

 tured. (PI. X. fig. 8.) 



144, crown and h inch of stem, free from matrix, flattened in 

 antero-posterior plane ; arms preserved up to post- 

 palmars 4*; on R. side ventral sac shows through 

 arms. (PI. X. fig. 1.) 



153, crown and | inch of stem, free from matrix except at 

 distal ends of arms ; much rolled but not flattened, 

 cup fractured. (PI. X. fig. 2.) 



These three specimens were in Mr. Charles Ketley's 

 collection. 



In the collection of William Madeley, Esq., of Dudley : 



One specimen, seen from anterior ; arms preserved up to 

 postpalmars 3 ; Ig inch of stem, slightly crushed. 

 (PL X. fig. 9.) 



In the collection of Charles Holcroft, Esq., of Kingswin- 

 ford, near Dudley : 



293, a young specimen ; crown and | inch of stem, seen from 



* I iise the expression " postpalmars 2, 3, 4 &c.'' for postpalmars of 

 the second, third, fourth, and subsequent series. ''Postpalmars" alone 

 signifies the first series. 



