332 Miscellaneous. 
two sides of a hastiform process. These setee are composite, falci- 
form, heterogomphous. The terminal joint increases in size from 
the lowest to the highest. The dorsal cirrus is much longer than 
the ventral. 
For this Annelid the author forms the genus Anoplonereis, and 
names the species A. Herrmanni, in honour of M. Herrmann, lately 
director of the laboratory at Concarneau, where these researches 
were made. The worm occurs about once upon ten Balanoglossz. 
There is no epitocous form; sexual maturity occursin May. ‘The 
males seemed to be rather more common than the females. The 
skin is delicate, and ruptures easily when the animal is immersed in 
absolute alcohol. 
As to the place to be given to Anopionereis among the Nereids, 
the author remarks that the presence of three antenne, the form of 
the superior ramus of the parapodia, the existenee of simple capillary 
setz, and the absence of jaws are so many characters which sepa- 
rate this Annelid from all the other Lycoridea. The absence of the 
superior ligula of the superior ramus occurs also in Ceratocephale 
and Dendronereis; but in these genera the sete are all compound, 
and in the second the dorsal cirrus is pinnate. The form of the 
parapodia approximates Anoplonerezs to the Hesionea, and especially 
to Pordake, and also to certain Syllidea, such as Pionosyllis, which 
also present simple sete in the superior and compound falciform 
setee in the inferior ramus of the parapodia. The presence of a 
third median antenna is also a Syllidian character met with in the 
Hesionea and Polynoé, but not in the Nereids. 
The complete absence of buccal armature is remarkable in a 
Lycoridian. In Ceratonereis, indeed, there are no paragnatha at the 
basal part of the proboscis, and in Leptonereis and some allied types 
the paragnatha even disappear entirely; but the absolutely un- 
armed proboscis of Anoplonereis is unique in the group Lycoridea, 
and no doubt connected with its parasitic mode of life. 
Thus Anoplonereis is a most curious type, uniting the Lycoridea on 
the one hand to the Hesionea and Polynoé, and on the other to the 
Syllidea; the last-named are to be regarded as the ancestors of the 
whole group of the Nereids (sensu latiori) as understood by Ehlers. 
—Comptes Rendus, August 21, 1882, p. 389. 
Orthocynodon, an Animal related to the Rhinoceros, from the 
Bridger Eocene*. By Wu. B. Scorr and Henry F. Oszorn. 
Orthocynodon is the name given to designate a new genus of the 
rhinoceros line from the Bridger Beds of Wyoming. It was dis- 
covered by the Princeton expedition of 1878, in the Bad Lands of 
Bitter Creek, It carries the rhinoceros line farther back than it 
has been supposed to exist. The oldest representative of this line 
known is Amynodon, a genus found by Prof. Marsh? in the Uintah 
beds which overlie the Bridger. Orthocynodon was at first referred 
to the latter genus, until important differences in the molar denti- 
tion were discovered. 
* Description from specimens in the E. M. Museum of Geology, Prince- 
ton, N. J. 
+ Am. Journ. Sci. ser. 5, vol. xiv. p. 251. 
