436 Dr. G. E. Dobson on a new Species o/*Macrotus. 



near the anterior side at about two-fifths the length of the 

 baek ; ^they are small, slightly prominent, and calyciform : 

 hinule indistinct : lujamcnt narrow, yellowish brown, altogether 

 external and placed between the " nymphw," or pouting edges 

 of the shell, on the posterior side : cartilage minute, oblong, 

 contained in a narrow depression immediately underneath the 

 hiiwks,: hinge-line obtuse-angled: hinge-plate rather narrow: 

 ^<Y'//(f small, erect, and pointed, 12 on the anterior side and 20 

 on the posterior side, the middle of the hinge-plate forming 

 the cartilage-pit : r«s/J<? polished ; edge plain : muscular and 

 2)allial scars large and conspicuous. L. 0*2. B. 0"35. 



Station 9, at the entrance of Davis Strait, 1750 fms. ; 

 Station 12, in the North Atlantic, 1450 fms. 'Porcupine' 

 Exp., 1869, off the north-western coast of Ireland, 1215- 

 1443 fms. ; 1870, Bay of Biscay, 718-1095 fms., and Medi- 

 terranean, 1415 fms. Norwegian Exp., 1876, 1800 fms. 



]May be easily known from J/, obtusa, Sars, by its very 

 different shape. 



XLTII. — Description of a new Species of Macrotus. 

 By G. E. DOHSON, M.A., M.B., F.L.S.,&c. 



Macrotus bocourtianus, n. sp. 



Ears as long as the head : front margin of the nose-leaf 

 scarcely diefined, continuous with the upper lip ; terminal leaf 

 narrow and subacutely pointed : last caudal vertebra and half 

 the antepenultimate vertebra free ; the free portion of the tail 

 nearly equal to the thumb in length. 



Teeth as in 31. waterhousii. Fur dark brown above, paler 

 beneath. 



Length (of a specimen not quite full-grown) — head and body 

 2*15 inclies ; tail 1*35, tail free from membrane 0^4 ; head 1*0 ; 

 ear I'O ; tragus 0*4 ; nose-leaf 0*3 ; forearm 2*05 ; thumb 0*5 ; 

 second finger — metacarp. 1'5, first phalanx 0*68, second plia- 

 laiixO'7, third phalanx 0'6 ; tliird finger — metacai-jD. 1*4, first 

 ])halanx 0*65, second phalanx 0*55 ; fourth finger — metacarp. 

 1'6, first phalanx 0"6, second phalanx 0*45 ; tibia 0*85 ; calca- 

 neum 0*35 ; foot and claws 0*45. 



The above description has been taken from the largest of 

 four specimens preserved in the Paris Museum, obtained by 

 M. Bocourt in ^'era Paz, Guatemala, which, through the kind- 

 ness of M. Alph. Milne-Edwards, I have been enabled to ex- 

 amine and describe. All the specimens agree in the remarkable 

 length of the projecting portion of the tail, and in other cha- 

 racters described above. 



