Dr. C. W. Andrews — A new Order of Ungulate Mammals. 481 



from the anterior genital plates by the antero-laterals and the 

 anterior complementary plate. Another large complementary plate, 

 which is elongate and hexagonal, separates the postero-lateral genitals. 

 The posterior oculars are small, the left being larger than the right ; 

 between them comes the posterior genital, of which the posterior 

 boundaries are indistinctly seen. 



Ambulacra not petaloid. The pores of each pair are slightly 

 oblique, the outer being aboral to the inner. The inner pore is 

 rather larger than the outer. On each plate one or more small, 

 sunken tubercles, which are perforate, increnulate, scrobiculate, and 

 well-spaced. Between the tubercles are many granules. 



Interambulacra broad, the postero-laterals being rather larger 

 than the antero-laterals. Plates with many tubercles and granules 

 similar to those of the ambulacra. 



The specimen was found in the Coralline Oolite of the lower 

 part of the south quarry at Upware, and is now preserved in the 

 Sedgwick Museum, Cambridge. The genus has not hitherto been 

 recorded in England. The types of Desorella elata came from the 

 Lower Corallian (Calcaire a chailles) of Yonne. 



EXPLANATION OF PLATE XVI. . 



Desorella elata (Desov) . Corallian: Upware, CambridgesMre. Aboral and posterior 

 views. Natural size. 



II. — Note on the Bakypoda, a new Order of Ungulate 



]\] ammals. 



By C. W. Andrews, D.Sc, F.G.S., British Museum (Natural History). 



N a notice published on page 160 of the present volume it was 

 suggested that Arsinoitlierium, of which a brief description was 

 there given, must be placed in the order Amblypoda, constituting 

 a new family, the Arsinoitheriid^e. Having further considered the 

 evidence available, and having, moreover, had the advantage of some 

 discussion on the subject with Professors H. F. Osborn and W. B. 

 Scott, I have now come to the conclusion that Arsinoitlierium differs 

 from the Amblypoda in so many points that it seems necessary to 

 refer that remarkable mammal to a new subdivision of the Ungulata 

 of equal value with the Amblypoda and Proboscidea, to both of 

 which a certain degree of relationship may exist. For this new 

 order the name Barypoda is proposed, in allusion to the massive 

 character of the limbs in the species at present known. The 

 existence of two orders so marked as the Proboscidea and the 

 Hyracoidea in the Eocene beds of Egypt, and their absence at that 

 period from the rest of tbe world (with the possible exception of 

 South America), at least make it seem likely that in an area so 

 isolated there were other equally distinct groups which died out 

 before circumstances became favourable to allowing them to pass 

 over to other regions. That Arsinoitlierium may be the repre- 

 sentative of such an order is probable, for its great size and 

 highly specialised character point to its being the closing member 

 of a long line, of which the eai'lier forms are at present quite 



