ON TWO ANNELID GENERA. 931 
14. On the Genera Ceratocephale Malmgren and Tylo- 
rhynchus Grube. By L. N. G. Ramsay, MeAwy Basc:, 
Carnegie Research Scholar, Christ’s Coliege, Cam- 
bridge *. 
[Received December 12, 1913: Read March 17, 1914] 
InDEX. 
Geographical distribution of Tylor hychus .......cccecereee serene 233 
Systematic : 
Ceratocephale osawai Izuka= Tylorhynchus chinensis Grube ... 231 
Genera Ceratocephale and Tylorhynchus, characters and 
relations 233 
Along with the Nereide which he collected at Puget Sound in 
1911, Mr. F. A. Potts recently handed over to me some specimens 
of Ceratocephale osawai from the Sumida River, Tokyo, Japan. 
The general facies of these worms recalled irresistibly to my 
mind Grube’s figures of Tylorhynchus chinensis, n his paper on 
the Annelids of the ‘ Novara’ Expedition (1867). Reference 
to the literature shows conclusively that the two species are 
identical. 
The object of this note, then, is to draw attention to this fact, 
and to indicate the characters and relationship of the two genera 
more clearly than these have hitherto been recognized. 
The identity of Tylorhynchus chinensis with Ceratocephaie 
osawai.—Izuka, discussing the systematic position of C. osawai in 
his original description of the species, remarks that he refers it 
to the genus Ceratocephale tentatively, in preference to creating 
» new genus for it (1903, p. 3). If we are to regard Tylo- 
rhynchus as a distinct genus (and there appears to be sufficient 
ground for this) Tzuka’s hesitation was fully justified. It is 
probable that only lack of access to Grube’s paper prevented him 
from recognizing the true position of the species. 
The facts are as follows :—The Japanese specimens (Izuka’s 
full description 1s illustrated by numerous excellent figures) 
agree in every way with those described by Grube 7 from 
Shanghai—as to parapodia, sete, general form, prostomium and 
its appendages; but they differ in the fact that the basal ring 
of the proboscis is devoid of papille, while those on the dorsal 
surface of the maxillary ring are less numerous. 
Among the specimens at present before me, however, three 
which have the proboscis everted exhibit a number of large 
swollen papille or protuberances on the basal ring, corresponding 
approximately to those figured by Grube, while the condition of 
* Communicated by Dr. A. E. SHIPLEY, E.RS., F.Z.S. ; 
+ Grube’s description is fully detailed, and is accompanied by figures by 
A. Afsmann, which are far above the usual standard. of the figures accompanying 
this authority's papers. 
