TWO ANNELID GENERA. UBS 
In Ceratocephale, these characters ave negatived, the neuro- 
ligule being well-developed, the neuro-cirrus double, and eyes 
completely absent. 
In other respects, the two show marked agreement. 
‘Lhe two genera appear to form a small group, diverging from 
the remainder of the family in the form of the parapodia, while 
showing some resemblance to the genera Leonnates and Leptonereis 
in the armature of the proboscis. 
Hitherto most authors have stated that TZylorhynchus is 
characterized by the presence of hard callosities on the proboscis, 
as opposed to the soft papillae of Ceratocephale. This is clearly 
due to a misapprehension of Grube’s original description of 
T. chinensis, where he describes the proboscis-armature as 
consisting of “calli” (Latin) or “ platten schwielchen.” There 
is, however, no reason to suppose that these differ in nature 
from the uncornified papille of Ceratocephale, Leonnates, ete. 
Survey of the two Genera as known up to date:— 
Genus TyLorHyNncHus Grube, 1867. 
Characters.—Prostomium bearing palps, tentacles, and two 
pairs of eyes, as in Wereis L. Peristomium apodous, with four 
pairs of tentacular cirri. Proboscis armed only with soft papille, 
and with a pair of jaws of typical nereid form. Parapodia 
biramous, the rami not deeply divided, the notopodium con- 
sisting of the mferior ligule only, with setigerous lobe at its 
base, the superior ligule being absent. In the first two pairs the 
aciculum and setigerous lobe of the notopodium are absent. 
The noto-cirrus in the anterior region borne upon an enlarged 
rounded lobe; the neuropodium consisting of setigerous lobe 
alone, without the ventral ligule, and bearing two “lips,” anterior 
and posterior; ventral cirrus simple. In the epitokous form no 
special foliaceous lobes are developed, but the original lobes are 
enlarged and flattened somewhat, in the middle region of the 
body. The sete are homogomph and heterogomph spinigers and 
falcigers as in WVereis, but some are of slightly peculiar type. In 
the heteronereid cultrate setze appear, as in Nereis, 
Range.—Western coasts of Japan (Izuka), Shanghai (Grube), 
Java (Quatrefages, see below), 
Species :— 
T. CHINENSIS Grube, 1867. 
Syn, Ceratocephale osawai Izuka, 1903 and 1912. 
Nereis heterocheta Quatrefages, 1865. 
** Die Japanischen Palolo,” Osawa, 1901. 
Range.—As for the genus. 
Quatretages (1865, p. 552) described, in his ‘ Histoire des 
