237 
shell of embryos forming polar prolongations which are more than twice 
as long as they are wide. 
Host, Cristivomer namaycush (Walbaum), the great lake trout. 
ECHINORHYNCHUS COREGONI Linkins, n. sp. 
(Pl. XXIII, XXIV, Fig. 6, 11, 13) 
“Body enlarged at anterior end. Males 3 to 3.7 mm. long, maximum 
width 0.8 to 1.05 mm., at anterior one-fourth of body. Females 3 to 5.5 
mui. long; widest part of body 0.6 to 1.5 mm. Proboscis cylindrical, carry- 
ing twenty circular rows of hooks, each circle containing six hooks. 
Hooks of adjacent rows alternate. Basal hooks 28 to 53 p» in length. 
Hooks in middle region of proboscis 65 to 80 » in length. Terminal hooks 
smaller than those of middle rows. Ventral hooks larger and stronger 
than dorsal hooks. Embryos vary from 51 to 91 » in length and from 17 
to 20 » in width. The common size is 77 by 19 p.” 
As indicated in an earlier part of this paper the above description is 
quoted directly from a manuscript thesis by Linkins. 
Host, Coregonus clupeiformis. 
PomrHoruyNcuus Monticelli, 1905 ; emended by Porta, 1907 
Monticelli (1905 :11) named the genus Pomphorhynchus in a foot- 
note, without citing for it any type or characteristic species. Furthermore, 
he did not, in his definition, differentiate the genus, as later emended by 
Porta, (1907), from the genus Filicollis. Porta (1907 :413) assigned 
Echinorhynchus proteus to the genus Pomphorhynchus, and since P. pro- 
teus is a synonym of P. laevis, the latter becomes the type of the genus. 
There are numerous early records of the occurrence of “FE. proteus” 
in North American fishes, but without much question they are all based 
upon misidentification of the species. The writer has examined numer- 
ous specimens from American hosts and has never found one which 
agreed with the detailed descriptions of the European species. All the 
examples of this genus that have come to the attention of the writer 
clearly belong to a new species, to which the manuscript name Pompho- 
rhynchus bulbocolli has been assigned by Linkins. Linkins’ description 
follows the generic diagnosis. 
Generic Diagnosis.—Acanthocephala parasitic as adults in the alimen- 
tary canal of fish. Body unarmed. Neck very long, cylindrical except at 
its anterior extremity, where it expands into an approximately spherical 
bulla. The proboscis extends as an approximately cylindrical structure 
from the anterior region of this neck-enlargement. Tip of proboscis 
somewhat reduced in size. Proboscis receptacle inserted at the base of 
the proboscis, extending posteriorly through the neck, as a double-walled 
sac, into the anterior portion of the body-cavity proper. Central nervous- 
system at the posterior end of the proboscis-receptacle. 
