PARASITES OF FISHES OF THE WOODS HOLE REGION. 481 



TREMATODES. 



5. Dixliiiiiiini l;i re Linton. 6, i>i>. 517-olS, jil. xi.iii, fii;s. o-S; pi. xi.iv, fiir. 1. 



Hippoglossus platessoides, Stml-ihih. 



XEM ATI IDES. 



1. .Uriiris liiciirrii Kndciljilii (?); vdnnfi- 



Two ininiatnre siieciniens obtained from rectinn of a sand-dab Viy Mr. B. A. Bean. The fish was 

 taken off Raee Point in 3-t fathoms, Aufjast 25, 189!i. The head agrees with this species; the tail, 

 liowever, is too bhnit unless they are immature males, which appears to be the case. Dimensions in 

 millimeters: Length, 25; dianieter, head 0.20, at liase of cesophagus 0.58, middle 0.84, at anal aperture 

 0.23, one millimeter from posterior end 0.51; length of head- 0.19, of lesophagu.s 3.84; distance from 

 anal aperture to posterior end, 0.22. There appears to he an anterior prolongation of intestine ])arallel 

 with lesophagus, 1.45 mm. in length. The inte-stine near the posterior end is capacious, with crumpled 

 walls. 



2. Ichtliiiiini'iiiii sp. Intestine. 



A slender nematode collected August 8, ISilit. .\lmost the entire body was tilled with elliptical 

 ova 0.041 and 0.024 mm. in the two ])rincipal diameters. Slender attenuate anteriorly, more rapidly 

 attenuate and acute at posterior end. (Ither dimensions in millimeters: CEsophagus at anterior end 

 0.058 in diameter, nearly cylindrical for a distance of 0.43, where it increases abrujitly from 0.072 to 

 0.094, increasing thence to the base, where it is 0.26 in diameter; whole length of ccsophagas, 3.9; 

 length of worm, 15; diameter, anterior 0.06, niiildle 0.4. 



Paralichthys dentatus, VIotinder. ' 



The stomachs usually contain lish and squiil. In one case bs sijuid were taken from tliestomacli 

 of a single flomider. A hermit crab along with fish, sijuid, small lish and crustaceans, are other 

 records of contents (if alimentary canals of the flounder. 



ACANXnoCEPn.^LA. 



1. Echinorlii/iK'hiiii iii-uif Rudolphi. Intestine. 3, pp. 52.5-528, pi. lx, figs. 89, 90. 



2. Jicliinorlnjncliiit: j/rukin: \\eiitrum]>. Ou mesentery. 7, p. 283. 



3. Echinorliyiichiix iiicriis.idliiit Molin. Peritoneum, 't, jiji. 533-.5.S4, pi. i.viii, Hgs. .")4-(>9». ,luly 18, 



1899. 



4. Erliinurlniiirliiix siiyiltifcr Lititon. On visceni. I. i<\<. 493—196, pi. vi, ligs. 1, 2. 3, pp. 5.3.5-.536, 



))1. Lix, tig. 80. 



XE.MATOnES. 



.5. liiunatiin' nuiiintodes (Asiyiri.'s) . [PI. xii, figs. 143-146; pi. xiii, figs. 147-1.51.] 



Of very frequent occurrence, encapsuled in the mesentery and on the viscera, 1884 to 1889. 

 Flounders were examined in 1899 on sixteen dates and nematodes recorded on nine of these. They 

 were examined on five dates in 1900 and nematodes recorded on each date. They occurred in varying 

 numl)ers, though only once numerous. 



6. Asairis (?) sp. Inte.stine. [PI. vii, figs. 57-61.] 



Two specimens obtained on August 9 and one on August 23, 1900; all females, active and mature. 



These worms are small, white, translucent. The mouth is relatively large and surrounded by three 



low, inconspicuous, rounded lol>es, each of which is provided on its inner surfai'e with a large numlier 



of minute teeth and apparently a single [lapilla. The liody is short, cylindrical, truncate in front, 



slender pointed at posterior end. The diameter equals about one-tenth of the entire length. It is 



nearly imiform from the anterior end to the middle, or a little behind the middle; that is, about to 



the genital opening, whence it tajiers very gradually toward the posterior end, narrowing rapidly just 



in front of the anus and likewise just at the anus. The tip is slender, but short acuminate. Tlie 



intestine is capacious. A short anterior diverticulum embraces the base of the cesoijhagus on one side 



and a longer one on the other. The ovaries are voluminous, the genital opening a little behind the 



middle of the length. 



F. c. li. 1S'J9— 31 



