On new Muride from Paraguay. Ws 
demersal eggs—that is, 75 per cent. pelagic and 12°5 per 
cent. viviparous and demersal each. These proportions are 
not markedly different from those found in the common 
shore-fishes of South Africa, where there are many viviparous 
blennies (Clinus), and probably about as many fish with 
demersal eggs (Gobius, Blennius, Chorisochismus, &c.). 
We seem, therefore, justified in concluding that the mode 
of reproduction of deep-sea fish will, on further investigation, 
probably prove to be not much different from that of those of 
the shallower waters—in the South-African seas, at least. 
EXPLANATION OF PLATE I. 
A cluster of fish-ezgs, attached to an Alcyonarian, trawled from a depth 
of 226 fathoms. Photograph, 14 natural size. 
XVII.—Two new Muride discovered in Paraguay by the 
Marquis de Wavrin. By OLDFIELD THOMAS. 
(Published by permission of the Trustees of the British Museum.) 
THE British Museum has received a very acceptable donation 
of anumber of small mammals obtained in the Northern Chaco 
of Paraguay by-the Marquis de Wavrin, who is making an 
important exploring expedition into South America. Among 
these there occur examples of the two following new species 
of Muridee. 
Oryzomys wavrint, sp. n. 
A middle-sized, coarse-haired, buffy-brown species, with 
proportionately short tail. 
Size intermediate between that of the large O. angouya 
and the small O. jlavescens. Fur long and coarse, hairs of 
back about 13-14 mm. in length. General colour above | 
browner and less buffy than in most species, a heavily lined 
** buffy-brown,” clearer buffy on the flanks. Under surface 
dull whitish with a slight buffy tinge, the hairs slaty at base. 
Proectote of ear blackish, metentote buffy brown like the 
head. Hairs of hands and feet glossy white, the feet with 
fairly well defined lateral fringes. Tail only about as long 
as the head and body, well haired, brown above, whitish on 
sides and below. 
Skull slender, not heavily ridged. Interorbital space 
narrow, its edges sharply square, but scarcely ridged, and 
Ann. & Mag. N. Hist. Ser. 9. Vol. vii. 12 
