964 Miscellaneous. 
wart-hog (Phacocherus), with m ge teeth like the elephant, 
from a pig (Sus), with simple ones, and therefore regarded that as 
a settled point. My infirmities not snare me to go beyond the 
walls of the Museum, I pau leave this question to be settled by 
those who can examine nimal. Can it be the female of the 
wild boar of Kordofan Pe pu called ** Quadruk " by the Arabs, 
or of the wild boar seen by urie in Africa? See * Catalogue 
of Carnivorous and Pais deii Mammalia in the Britis 
Museum,’ p. 338. 
On the Circulation oe the hp ned i the Nais-group. 
M. E. Per 
In his anatomieal "eut of a5 ORUM Annelides, M. 
Claparéde entirely passed over the Nais-group ; and no important 
work has since been published upon those animals. A tolerably ex- 
tensive investigation of Dero obtusa, an animal nearly allied to Nais, 
o 
Dero scarcely differs from Nais except by its possession of a 
branchial apparatus composed of four simple retractile digitations 
inserted upon a sort of lobe ( pavillon), which spreads out e pa = 
terior etd of the body, and of which a figure, incorrect 
respects, has been given by D'Udekem in the « Bulletins de T Académie 
Royale de Belgique.’ 
e circulatory apparatus of Dero obtusa consists essentially of a 
véntisl and a dorsal vessel, both lying in the median line. The M 
vessel is contractile. These two principal trunks are united in 
very complex manner, which must be studied in the head, in the 
anterior segments, the middle segments, and the caudal respiratory 
apparatus. 
In the five segments which follow the head the two median 
vessels are united | hy an infinity of lateral branches, forming a very 
esophagus ; these two vessels are enpagi diminished when they 
reach the cephalic region. Beneath the mouth the ventral vessel 
emits two branches, which penetrate into the cephalic cavity ; the 
dorsal vessel is prolonged above the brain to the anterior extremity 
of the cephalic cavity, and then it divides into two branches, which 
bend back on each side and become ngain su ubdivided; into these 
the two branches of the ventral vessel o 
In segments 6, T, ane 8, there are cad ee hearts, each 
