PARASITES OF FISHES OF THE AVOODS HOLE REGION. 453 



Palinurichtiiys perciformis, Ruihh r-jhli. , 



Squid, small criij^tiiceans, univalve inollusks. (T, p. 279.) 8alpa and a slcndi-r ■.'i-t'cn aVii found 

 in tlio alimentary tracts n£ two tisli from Mencmsha, September 1, 1900. 



ALAXTnoCEPIIAI.A. 



1. Kriiiiiijriiinicliiix jirislis Rudolplii. Int<>stine. (Variety li imiruniix.) St, jip. ."iMl-.-ilW, pi. i.vi, ivr-i. 



I!9-41. and pi. i.vii, fifrs. 42-."v!. 7, p. 279. 



CESTOnES. 



2. I,iirrid rrxlntlis (Snilc'r pdliiiiiorjilnix Dujardin). Free in alimentary tract. -1, jip. 7SSI-792, pi. t..\i, 



fJKt'. -t-l.'S. 7. p. 279. Found also Sept. 1, 1900. 



TRE5IATODEK. 



3. Distiiiiiuiii piirlfiiriiii l.inton. Intestine. 7, pp. 279, 292-29:!, pi. .xxxviii, lisjs. ."i2-.")9. Found Sept. 



1, 1900. 



lUioiubus triacantbus {StfDiiint' ns lri(i<'<in/liiis). Hullir-tinh. 



Stomaeh.s of larmier tish usually empty, Ijut a few frat;inents of lisli oecasionally seen. In the 

 alimentary tracts of smaller .specimens copepods, annelids, and small lish \\ere found. Sept. 1, 1900, 

 2.T small fish were examined. The food consisted principally of amphipoils. 



.U-A.VTIIoi EI>nAI..\. 



1. JCclihiiirluinrliii.i .sr(;/i7^(/('/- Linton. .July 24, 1900. lOncapsuled on viscera. See I, pp. 49:i— 190, jil. 



VI, (iifs. 1, 2. :{, p]i. .5.>.5-.5.%, pi. Li.\, tig. SO. 



N'EM.\TonES. 



2. ('Hcullitiiiis sp. 



U. S. National Museum collection; Vineyard Sound; V. X. Edwards, collector. One female, with 

 segmenting ova; resophagus sinuous; liody of nearly .same 'diameter throughout. Iiimensions in 

 millimeters: Length, 9; diameter, 0..S8; length of tesophagu.s, 0..5; diameter of u-.soj)liagus 0.0.5, at 

 anterior einl 0.09; diameter of head, 0.12. 

 .'i. Ii)imatiiri)inii(ili><lr!i. On viscera. [PI. xii, figs. l:)2, L'm.] 7, ji. 279. 



Very abundant. Fouml in the majority of specimens examined in 1S99 and 1900; small, pale 

 red; ])articularly abundant on j^yloric ca>ca. A. specimen foun<l in the stoma<-h of a sea bass yielded a 

 large number of these wornis. If the process of digestion had proceeded a little further, the sea bass 

 would have been the accredite<l host of these nematodes. Dimensions in millimeters: Length, i:!; 

 diameter, head 0.14, 1 mm. from head 0.2S, maxinnnu (toward |)osterior end) 0..S4, 1 mm. from 

 posterior end 0.2S, at anal aiiertnre 0.2:1: distance fioni anal ajierture to xwsterior I'lid, 0.:!(). 



CESTODES. 



4. llliiinchohtitliriinii. Cysts on viscera. 7, ]i. 279. Numerous examples were found in the summers 



of 1899 and 1900. 

 .\n interesting case of almormality was noted in a specimen collected July 27, 1899. Only 

 one-half the larva — i. e., one liothrium with its pair of i)rol)oscides, including the contractile bulbs — 

 was ijresent. This could not ha\e been a case of mutilation, since it was .seen to be almormal when it 

 issued from the blastocyst while under the compres.sor. The hooks on the retracted jiroboscides of 

 this specimen resemble those of /.'. Ini/liifir. 



5. Rhynchoholhrhuii . Cysts in muscles. [PI. .xxiii, figs. 2.5o-2.50fl, and pi. xxiv, fig. 265.] 



On August 2(), 1899, two butter-fish, which had been cleaneil and prepared for the table, were 

 submitted to me by Dr. F. Judson Ilerrick, \^■ho, after having had an opinion rendered regarding their 

 condition, decided to allow them to be devoted to the cause of science. The nui.scles between the ribs 

 contained great numbers of small cysts. When one of these was compressed, a blastocyst was liberated, 



