Trichoslrontp/le Genus from an Armadillo. 417 



the e^lge of the bursa, whereas tlie tip of the latter is sharply 

 recurved dorsalwards. Tiie extenio-lateral ray is the thickest 

 of the lateral rays, and is inclined slightly forwards and 

 ventralwards, as also does the lalero-ventral ray. The rentro- 

 ventral ray is bent wholly in an arch directed forwards and 

 inwards. 



There are no prebursal papillae. 



Tiie spicules (fig. 4) are ot' a brown colour ; they are large, 

 tubular, and equal in length. The base of each is bent 

 outwards almost at right angles to the stem. They measure 



Fig. 4. 



Fis. 



A ^ 



Fig. 4. — Spicule*, dorsal Tiew. 



Fig. 5. — Guberuaculum. A = dorsal view ; B = side view. 



270 fi in length by IS /x in maximum breadth ; posteriorly 

 each has a dorsal branch which is bent slightly ventralwards. 

 Each branch beai-s on its inner surface, about in its middle, 

 a ventrally projecting spike-like process. 



The gubernaculum(fig. 5, A and B) is conspicuous, measuring 

 about 140 /i in length ; posteriorly it is thickened into a knob 

 20 fi long by 10 /* broad ; anteriorly it tapers to a rounded 

 point. On its dorsal surface it bears a keel ; this is about 

 14 /i deep and extends for about half its length from the 

 posterior end. 



