1895.] OK FISHES TROM MATTO GROSSO AND PARAGUAY. 523 



This Gazelle wils said to be known to the Arabs of the libyau 

 or Western Desert of Egypt as the " Ghazal abiad," or White 

 Gazelle ; but was certainly not nearly so common as Gazella dorcas, 

 which occurred in both the Eastern and Western Deserts. 



Mr. W. Saville Kent, E.Z.S., exhibited a coloiu-ed sketch of a 

 species of Nudibranchiate Mollusk, which he had met with in 

 Western Australia, remarkable for its large size and colouring, and 

 probably referable to Doris or an allied genus. 



A communication was i*ead from Messrs. E. E. Beddard, M.A., 

 E.E.S., and A. C. Haddon, M.A., M.E.I.A., containing descrip- 

 tions of a number of new species of Nudibranchiate Moliusks, 

 examples of which had been collected by the latter author during 

 his recent stay in the neighbourhood of Torres Straits. 



This paper will be published entire in the Society's ' Transac- 

 tions.' 



Mr. G. A. Boulenger, E.E.S., gave an account of a large collec- 

 tion of Eishes formed by Dr. C. Ternetz at various localities in 

 Matto Grosso and Paraguay. So few Eishes had been collected in 

 the Paraguay system since the time of Natterer, that it seemed 

 desirable that a full list of all the species represented in the 

 present collection should be given. This was accordingly done, 

 the specimens being referred to 97 species, of which the following 

 were described as new : — 



1. Plagioscion ternetzi, sp. n. 



Outer, upper, and inner lower teeth considerably enlarged. 

 Depth of body 3 times in total length, length of head 3 to 3^ 

 times ; snout a little longer than diameter of eye, which is 5 to 5| 

 times in length of head ; interorbital wdth equal to length of 

 snout, 4 times in length of head ; maxilLary extending to below 

 posterior border of eye ; prseopercular border rounded, finely 

 denticulated behind, with wide-apart small serrse at the angle and 

 below. 15 gill-rakers on lower part of anterior arch, the longest 

 as long as or a little shorter than longest gill-filaments. Lower 

 pharyngeal teeth villiform. Dorsal X, I 33-35 : third and fourth 

 or fourth and fifth spines longest, § to f length of head. Pectoral 

 nearly | length of head. Anal II 6 ; second spine very strong, 

 5 length of head. Caudal pointed, densely scaled. The distance 

 between base of anal and base of caudal 2^ depth of caudal 



peduncle. Scales nearly all ctenoid, 95-100 2^^ ; lat. 1. 48-50. 

 Uniform silvery. 



Total length 450 millim. 



Two specimens, from Eemanso, Eio Grande, Paraguay. 



This speQies is allied to Scicena s^irinamensis, Blkr. 



