458 BULLETIN OF THE UNITED STATES FISU COMMISSION. 



XKM ATllDES. 



8. Axrarix n^. [PI. viii, ti^rs. i).')-<>ii.] 



A small lot ill ascariils in the li. S. Nalimial Musimuu collcili.iii I'mm :i srii|i whicli hail liri'ii taken 

 from the stomacli of a cero (Sftniiliiroiinpriix injiilix). These are thiekest alxxit the mi<l<lle, rather more 

 sleiiiler anteriorly than ]>osteriorly; lateral ala- for Jiliont I tnm. hack of heail: tail sonu-what .Jjeiiiler 

 anil iirolonfieil heyonil thi'anal a|K-rtiire, ile<'i<leilly a)i|>r"sseil; hoily erossiil hy line transverse lines, 

 I K'st sei'n toward posterior eml. I)iinensions in millimeters: Length, 45; ilianieter of lieail, 0.2:!, 4 mm. 

 hack of hea<l 0.4S, 10 mm. hiu-k of heail O.tiS; meilian, 1.2.8, 1 mm. from posterior eml (i.4.i, al anal 

 aperture (ventral view) 0.2S; ilislaiice of anal aperture from posterior einl, 0.8.1. 



4. ImiiKiliiir wiiialndis {.liuxiriy) . [I'l. \, li;.'s. llO-llfi; i)l. xi, li^s. 117-120.] 



Very eonnnon in hinly cavity on viscera. Kounil in at le;ust 7") per cent of the scnp examiiieil in 

 the [la.-*! two sununers; also noteil repeateilly in previous years. A careful stuily of thes*.- forms is 

 neeileil in onler to lix their ])osilion. Some of th<'m with the i-harai-teristic heail of .{ijidihiih iiin, after 

 the removal of the iiiliile, revealeil the unmistakahle jaws of Asnirix. .Measurements of one are jjiven 

 in 7, 11. 2S0. I ailil, for the purpose of conipari.-:on, measurements in millimeters, of a specimen from 

 the vi.-icera of a .scup collecteil .Inly 24, 18!)!l; U'nf;th, 20; iliameler, anterior 0.12, midiUe 0.5, at anal 

 aperture 0.24; diameter of (e.sopha<;us, anterior0.07, middle 0.08, l)ii.se0.12; lenj^th of ie.sopha<;us, 1.25; 

 distance to nerve rinjr 0.57; distance of anal aperture from [Kisterior end 0.45. In this specimen there 

 w;is an intestinal diverlicuhnn, short, hifnrcate, prolonjied <ephalad, and a longer, more slender 

 prolon^ration of the o^soiiha^us. These immature forms are pmhahly identical with those in the lilue- 

 lish, si|ueli'a<xue, and otliei>. Kijiures 117, 1 18 are sketched from a speiimen collected l>y Mr. K. K. 

 Ivirll, at Charleston, S. C, March, ISSO. The capsules were mostly cluli-slia|«'d, arcuate, orstraijrhtish; 

 cuticle very finely Iransvei'se striate. Length, 22 mm.; diameter, 0.;!:! mm. 



OUTODKS. 



5. lOiiiiiiliiiliiillirium inipdrixpiin Linton. Kncysted on viscera, pound in ISMli. .<i'e 5. ]ip. 7!l!'-8lll. 

 •i. lihirnihiiliiitliriiiiii xiM'cioimiii Linton. On viscera. 5, p. 802. 



7. lilii/itchdliiilhriuiH. Encysted on viscera. 5, p. 796, [il. i.\m, li._'s. l(i-l:;. 7, p. 280. Kouml in 



18ilil and 1000 in a larjre proportion of the scup examined. 



8. Ttlrni-liiiiu-hii.i liimilnilux Linton. Stomach wall. 5, p. 8111. 



VI. I.iirnilcivlo'li.'<iScoli'.iji"liiiii<iriiliii«\>u]i{ri\\n). I'rce in inlisliric 7,]i.2S0. See I. p. 7!»1. Seen 

 frei|uently in ISWand l!)Ot). 



Tl(K.M.\TOI)KS. 



10. Diitomiim rililUmiiii Linton. [I'l. \x\, fiirs. ;i:«, .■«4.] See 7, (i. 290, j.l. wxvii, (i-rs. .SS, 30. 



Seen often in 1899 and 1901), hut always in small numbers. I a|ipend notes made on a siK'cimen 

 taken .Vu-iust 23, 1900. Worm small (1.2 nun. when at re.st), very active while in sea water and salt 

 .■JolutioM, neck extremely mobile, slretehiuir to thread-like thinners and contractin.if until the suckers 

 were close losiether; jieiieral outline, proportions, and aiijieariuice of the body underi;oinjr constant and 

 peqilexiuf; clian<res; acetabulum nuich larger than oral sucker and kept expanded, i. e., its walls when 

 the specimen was viewed from the side forndn^ a semicircle or widely open C. When ]>lai'e<l in fresh 

 water the worm soon became tnr<;id, with neck reflected, acetabulnm contracted until its walls were 

 close tofiether, iind di*itinctly peilieeled. See under Clupe'i hnmiffiix, riindU-Mhiix ilenUilvx, etc. 



11. Didoiiiiim »\K [PI. xxxi, liir. ;i4r).] 



I here place certain small distomes, which appear to be near IK jiiirlforiiii\ if not identical with 

 that species, but until more material is available and a careful coiM]iarative topojiraphical study of 

 these small forms lan be made it will be better perhaps to leave them without speci(icdesi;;nalion for 

 the i>resent. Thi'se are small, usually oval, (latteneil, white ili.«tinnes, with minute spini'S. They were 

 mo.st numerous in small scup, seen fre(|uently (but in small mnubers) in this and other host.s. The 

 identiliealion of these distomes is ditlicnlt, on account of the spine.s, whicli aiiiiarently fall off easily. 

 See No. 21 under J'tiriitlclilhi/x ilrulnhix. No. 11 uii<ler IHmmhifx Irinrinilliux, and No. 1.5 under I'oiiinlomiix 

 xiilliilri.i . One of these distomes, collected .\ii<;ust 29, 19(X1, was i>laced under slijjht pn\>i.sure and seen 

 in favorsiblc conditions. Spherical bodies with concentrii- structure were present in the excretory 

 vessels, and the cirrus was seen to be spino.'Je. .\ cell from the t.'erm jiland was seen enterini; the shell 

 mold. II appeared to be attached by a slender iii-dicel for :i few seconds. It wa.s surrounded by 



