452 
BULLETIN OE THE UNITED STATES FISH COMMISSION. 
Dimensions of a specimen in glycerine, measurements in millimeters: Length of body proper 
4, of posterior sucker-bearing portion 4; diameter of body, maximum 1.5, of posterior sucker-bearing 
portion 0.57 near body and 0.37 near tip; diameter of single posterior sucker, 0.065; diameter of anterior 
end through suckers, 0.25; anterior suckers, two in number, 0.11 in length, 0.10 in breadth; pharynx, 
seen only in dorsal view, adjacent to suckers, length 0.07, breadth 0.05; length of ovum exclusive of 
filaments, 0.21. Length of body in another specimen, 7; maximum diameter, 1.5; length of posterior 
sucker-bearing portion, 4. The number of posterior suckers is about 90 in each row, or 180 in all. 
Rachy cent ron canadus, Cobia, Crab-eater. 
FOOD. 
A specimen taken in Buzzards Bay, July 15, 1899, was kept in a large pool at the Fish Commis- 
sion laboratory until August 31, when it was examined for parasites. The stomach contained large 
numbers of bones, mostly vertebrae of fish (squeteague, etc.) from which the flesh had been entirely 
digested. 
NEMATODES. 
1. Ascaris inquies, sp. nov. [PI. vi, figs. 46-50.] 
The stomach contained a large number of nematodes, which were very active and remained active 
for several hours in sea water. Indeed, they showed no tendency to come to rest at the time they 
were put in the killing fluid. While these worms have not yet been worked up, the following brief 
characterization may be given in this preliminary report. The general color of the body in life 
was dark ashy brown; head and anterior part of the body to the base of the oesophagus white. Jaws 
prominent, head wider than neck, which is sharply 'serrated, being crossed by fine transverse lines 
at regular intervals. Posterior end acuminate. The preanal papillae appear to be about 24 on each 
side, the posterior 10 of these small; postanal papillae not seen distinctly, probably 4, very small. 
The following measurements of a female in acetic acid are given in millimeters: Length, 40; length 
of oesophagus, 2.47; length of head 0.16, breadth 0.29; diameter of neck at head, 0.16; maximum 
diameter of body near posterier end, 0.8; diameter 1 mm. from posterior end, 0.44; diameter at anus, 
0. 44. distance of anus from posterior tip, 0.51; distance between striae on neck, 0.024. 
Coryphaena hippurus, Dolphin. 
The specimens which were brought into the laboratory had been eviscerated so that only cestodes 
encysted on the peritoneum were seen. The nematodes mentioned here are from the U. S. National 
Museum collection. 
NEMATODES. 
1. Ascaris increscens Molin. Stomach. Collected June 24, 1887. [PI. vm, figs. 62-64.] 
Dimensions of one of the largest in millimeters: Length, 43; diameter of head 0.17, 2 mm. back 
of head 0.24, middle 0.7, at anal aperture 0.28; distance from anal aperture to posterior tip, 0.34; length 
of male spicules, 3. Tip of tail of one mucronate with short spines. These specimens are referred to 
this species provisionally. 
CESTODES. 
2. Iihynchobothriurn sp. [PI. xxi, figs. 239,240.] 
August 23, 1899. From large blastocyst 30 mm. in length, 5 mm. in diameter at anterior end, 
tapering to point at posterior end. The larva measured 15 mm. in length. The hooks of this 
specimen were not seen, but the general appearance of the larva, as well as of its blastocyst, is much 
like that of R. speciosum. 
3. Tetrarhynchus bicolor Bartels. 4, pp. 813-815, pi. lxviii, figs. 1-6. 
Also found both free and encysted on peritoneum of two dolphins, Aug. 23, 1899. Pedunculated 
ysts with network of capillaries on exterior, when opened, liberated an active larva. 
TEEMATODES. 
4. Distomum tomatum Rudolphi. <S, pp. 513, 514, pi. xlii, figs. 6-12. See No. 3 under Menidia notata. 
