1898,] MB. E. W. L, HOLT ON SCOPELtTS GlAClAI-IS. 279 



Dimensions of the typical skull, that of an immature male with 

 the milk-dentition still in place : — greatest length 123 mm. ; basal 

 length 103'5 ; greatest breadth 59 ; nasals, length 22, breadth 

 22 ; breadth of nasal opening 17 ; intertemporal breadth 44-5 ; 

 breadth of brain-case 47 ; gnathion to junction of nasals and 

 premaxillse 37'7 ; gnathion to orbit 58"5 ; gnathion to front of 

 alveolus of anterior premolar 28'5 ; palate, length 60. Length of 

 horn in a straight line 78 mm. ; circumference at base 48. 



Hab. N. E. Africa — probably the neighbourhood of Lake Rudolf. 



Type in the British Museum, collected and presented by Mr. 

 H. S. H. Cavendish. (Should the skull and the skin be wrongly 

 assigned to each other, the skull should be considered as the type.) 



Of all the species found in Northern and Eastern Africa, that 

 discovered by Mr. Cavendish is by far the finest, for the typical 

 skull decidedly exceeds that of any of them in size, while it is 

 itself not yet adult. The south-western species, M. damarensis, 

 however, is of approximately the same size, although it is difficult 

 to make an exact comparison between the two, owing to the fact 

 that the only available skull of M. damarensis belongs to an old 

 female, while that of M. cavendishi is an immature male. 



For the same reason the specific differences between the two 

 forms are difficult of exact definition, but the darker general colour, 

 the broader and differently-shaped nasals, the higher and more 

 open nasal cavity, and the separated premaxillse of M. cavendishi, 

 combined with the essential difference between the faunas of 

 Damaraland and Lake Eudolf, seem to render it impossible that 

 Mr. Cavendish's Dik-dik should be assigned to the south-western 

 species. 



I have named this fine Dik-dik in honour of its discoverer, the 

 first British explorer to ci-oss from Somaliland by Lake Rudolf 

 into our East African territories, and the donor to the national 

 Museum of a number of the specimens obtained during this 

 journey. 



April 19th, 1898. 

 Prof. G. B. Howes, E.E.S., F.Z.S., in the Chair. 



Mr. E. W. L. Holt exhibited some advanced larvse of the 

 luminous Fish Seopelus glacialis, Eeinhardt, taken by Dr. Gr. H. 

 Fowler in the Faroe Channel, and made the following remarks : — 



"The larval stages of Scopelus have not been described. An 

 almost complete series was obtained by Dr. Fowler. They are 

 remarkable in the possession of a dorsal expansion of the skin, 

 probably functional as a float, which persists until the adult 

 organs of locomotion are practically perfect. Such floats are 

 known in the larvae of Gadus and Solea, but only in the very early 

 stages. The specimens of Scopelus explain the nature of the 

 dorsal fold of skin in Anomcdopterus, a genus founded by Vaillant 



