URANASTER KINAHANI. 107 



proximal adarabulacralia are smaller than those a little way dovv^n the arm, and 

 thus the groove is slightly petaloid. Each adarabulacral has the usual prominent 

 nose and possesses pustules which undoubtedly carried small spines. 



The ambulacralia are almost square, and the groove, except near the mouth, 

 appears to have been shallow. Each ambulacral bears a prominent — l-shaped 

 ridge, and appears to fit so closely with its neighbour that there are no pores for 

 the passage of ampulla?. The groove is always found widely open. Between the 

 ambulacralia of opposite sides of the arm there is a deeply excavate ambulacral 

 channel. 



The infero-marginalia in tlie interradii are paired, and the odontophor, if present, 

 is not visible in external view as in the families already dealt with. These 

 interradial marginalia are nmcli broader than they are long (length is 1 mm. ; 

 breadth is 2 mm.). The disproportion between length and breadth is soon lost, for 



Text-fig. 62.— Wash drawing of the ossicles in the mouth-region of TJranasler kinahani (taken from 



S. 1443). X 6. 



the second infero-marginal is almost square. From the fourth ossicle onwards, the 

 length is greater than the breadth. Except in the interradii the infero-marginalia 

 adjoin the adambulacralia. At all the points at which the two series touch, that is 

 almost throughout the length of the arm, the infero-marginalia are equal in number 

 to, and alternate with, the adambulacralia. There are about thirty infero-marginalia 

 reckoning from an interradius to the tip of the arm. The exact number is difficult 

 to ascertain because of imperfections in preservation. 



From about the middle of the arm the infero-marginalia pass over on to the 

 lateral margin. The adambulacralia then bound the arms. This is another feature 

 not observed in the Hudsonasteridse and Promopalaeasteridae. 



Oriuwient. — The ornament is not well preserved, but one or two infero- 

 marginalia are covered with coarse contiguous pustules. 



Measurements. — The two specimens which allow exact measurement give the 

 following dimensions for the major and minor radius respectively : 

 S. U43 R. : r : : 32-5 mm. : 7-5 mm. 

 S. 1439a R. : r : : 35 mm. : 8 mm. 



