452 BULLETIN OF THE UNITED STATES FISH COMMISSION. 



Dimensions of a specimen in glycerine, measurements in millimeters: lycnjith of body pro[)er 

 4, of posterior sucker-ljearing portion 4; diameter of body, maximum 1.5, of jio^terior sucker-bearinj; 

 portion 0.57 near body and 0.37 near tip; diameter of single posterior sucker, O.OtiS; <lianietcr of anterior 

 end througli suckers, 0.25; anterior suckers, two in nunilier, 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 

 tilaments, 0.21. Length of Iwidy in another specimen, 7; maximum diameter, 1.5; length of posterior 

 sucker-ljearing jwrtion, 4. The miiiiber of posterior suckers is about 90 in cacli row, or 180 in all. 



Rachycentron canadus, Cohin. Crab-ialir. 



FOOD. 



A specimen taken in Buzzards Bay, July 15, 1899, was kept in a large pool at the Fish Commis- 

 sion laboratory until .\ugust 31, when it was examined for parasites. The stomach contained large 

 numbers of bones, mostly vertebra.' of fish (squeteague, etc.) from which the flesh had been entirely 

 digested. 



.N"E.M.\TODES. 



1. ,l.sc«ri« m</i(i<>-, sp. nov. [PI. vi, (igs. 4()-.50.] 



The stoniad) contained a large nmnbcr of nematodes, which were very active ami remaineil active 

 for several houi-s in sea water. Imleed, 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 folluwing brief 

 chara<'tt'rization may be given in this preliminary rejKirt. The general color of the body in life 

 was ilark ashy brown: head and anterior part of the body to the base of the ic.^ophagus white. .laws 

 prominent, heail wider than neck, which is sharply serrated, tx'iiig crossed by tine transverse lines 

 at regular interval.s. I'ostenor end acunjinate. The preanal jiapillie ap|>earto be about 24 on each 

 si<le, the posterior 10 of these small; postanal papilUc not seen distinctly, probably 4, very small. 

 The following measurements of a female in acetic acid arc given in millimetei-s: IxMigtli, 40; Irngth 

 of o'sophagus, 2.47; length of head 0.10, breadth 0.29; diameter of neck at head, 0. Ui; maxinuim 

 diameter of body near posterier end, 0..S; diameter 1 nun. from posterior end, 0.44; diameter at aims, 

 0.44; distance of anus from iM)sterior tip, 0.51; distance between stria- on neck, 0.024. 



Corypheena hippurus, Dolphin. 



The spi'cimens which were brouglii iiilo the lalioratory had been eviscerated so that only cestodes 

 encysted on the peritoneum were seen. The nematodes mentionc^I here are from the U. S. National 

 Musi'imi iiillection. 



XK.M.\Tor)EJ>. 



1. Ascarlx iiicriwiiis Mithii. Slomaih. Ciillectcd .lune 24, 1.S.S7. [I'l. viii, figs. 62-<i4.] 



Dimensions of one of the lai^csl in niillinu'ters: Length, 43; iliameterof head 0.17. 2 nun. back 

 of head 0.24, miildle 0.7, at anal aperture 0.2,S; distance from anal aperture to posterior (ip, 0..34; length 

 of male spicules, 3. Tip i>f tail of ,>iie mucronale with slmrt spines. Tlie.se specimens are referred to 

 this species prDvisioiially. 



(•E.STODE.S. 



2. Rlnjnrholiolhrhim sp. [I'l. \xi, tigs. 2:J9, 240.] 



August 23, 1899. From large l>la.«tocyst 30 mm. in length, 5 nun. in diameter at anterior end, 

 tapering to point at posterior end. The larva measm'ed 15 mm. in length. The hooks of this 

 s|)ecimen were not seen, but the general ajipearanee of the larva, as well as of its blastocyst, is much 

 like that of y\'. xpeclomm. 



3. Telrarhi/tirlnix liicolor Hartels. -I, pp. 81:5-815, pi. i.xviii, figs. l-ti. 



Also found both fn'e and encysted on peritoneum of two dolphin.s, .Vug. 23, 1,S99. reilunculate<l 

 Vsts with network of capillaries on exterior, when openetl, liberated an active larva. 



TRKM.VroDKS. 



4. Dinlomum lornalum Kudolphi. <!. pp. 513.514, ]il. xi.ii, figs. (>-12. See Xo. 3 under MntidUi riotato. 



