468 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
Several other lots, most of them collected by Mr. Edwards, consist of immature nematodes 
encapsuled on viscera. They are young ascarids, and while their relative proportions differ consider- 
ably from the larger specimens they are, without much doubt, younger forms of the same species. 
Dimensions of a typical specimen in millimeters: Length, 15; diameter of head 0.08, middle 0.31, at 
anal aperture 0.12; distance of anal aperture from posterior tip, 0.21. [Figs. 157-159.] See under 
Glyptocephalus cynoglossus. 
TREMATODES. 
2. Distomum simplex (?) Rudolphi. Intestine. 6, pp. 525-520, pi. xlvii, figs. 3-7. 
Opsanus tau ( Batrachus tau ) , Toad-fish. 
FOOD. 
Among my food notes of this species I find the following noted: Littorina liltoria, llyanassa ohsoleta, 
Trittia Irivitata, Urosalpynx cinerea, usually with hermit crabs; Crepidida fornicata, Pecten irradians, 
Cancer irroratus, Pahemonetes vulgaris, Eupagurus longicarpus; bones and other fragments of fish; a 
partly digested toad-fish. I have seen a toad-fish in the aquarium in the act of swallowing another of 
its own species but little smaller than itself. In the alimentary canal of a small specimen two shells 
of Utriculus canaliculatus (Bulla) were found. 
ACA NTHOCE PH A LA . 
1. Echinorlvynchus acus Rudolphi. Intestine. Oct. 22, 1887. Collected by Vinal N. Edwards. Length, 
22 mm. See !{, p. 525; 1, p. 492. 
2. Echinorlvynchus agilis Rudolphi. 
In the U. S. Nat. Mus. collection; a single specimen, collected at Woods Hole. Length, 4 mm. 
3. Echinorhynchusfusiforrnis Zeder (?). [PI. ii, fig. 11.] Intestine. 
One specimen, a male, collected August 7, 1899. This appears to be near E. fusiformis Zeder. 
The body is fusiform, gradually attenuate in front to the base of the proboscis, abruptly constricted at 
testes, whence it is cylindrical to the posterior end. Proboscis clavate; eight vertical rows of hooks 
visible on a side and about fifteen hooks in a vertical row. The hooks are sharp, recurved, and rather 
slender. Testes two, elongated, lying end to end, and are followed by an elongated, tubular, seminal 
receptacle and a subglobular bulbus ejaculatorius (?), which communicates with the copulatory bursa 
by a slender duct. 
Dimensions of a mounted specimen, from which this description was written, in millimeters: 
Length, 5; length of proboscis 0.66, of proboscis sheath 0.73, of lemnisci 1 ; diameter of proboscis, apex 
0.15, middle 0.13, base 0.10; diameter of body anterior 0.15, middle 0.48, posterior 0.13. 
NEMATODES. 
4. Ascaris habena Linton. Stomach and intestine. 7 , pp. 282, 302-303, pi. xliii, figs. 109-115. 
Found five times in the summer of 1899 and four times in the summer of 1900. It was found in 
every lot of toad-fish examined, although not in every individual. The eggs of this species are large 
and rather transparent. [PI. vi, figs. 56 a-i] The number of chromosomes appears to be small. A 
sketch of a young specimen with embryonic cuticle is shown in pi. vi, fig. 55. 
CESTODES. 
5. Phynchobothriurn tumidulum Linton. Scolices in intestine. See 4, pp. 829-832, pi. xi, figs. 3-11. 
July 26, 1900; 1. Aug. 10, 1900; numerous. 
These scolices are characterized by having a conspicuous red pigment blotch in the neck. Others 
with essentially the same kind of proboscides, but with no red pigment, were found August 5, 1899. 
The hooks and proboscides resemble It. tumidulum. [PI. xxi, fig. 241.] 
TREMATODES. 
6. Distomum tenue Linton. Intestine. See <», pp. 535-536, pi. lii, 2-8. Aug. 15, 1899; July 26, 1900; 
Aug. 4 and 10, 1900; few. Color in life translucent bluish-white, vitellaria yellowish-green. 
