444 BULLETIN i)K TIIK INITKD STATES FISH COMMISSION. 



TKEMATOllES. 



3. Distomum tomalum 'RviiMphi. [PI. xxviii, li;;. 310.] Aug. 28, 1899; 30. Aug. 30, 1899; 10. .July 



17, 1900; ft'W. See Xd. 4, under Corij[>li»itn liippunis. 



.Maximuni size: lA-nfrth, 11 iiiiii.; iliaineU-r, 2 luiii. 



Till- f<ill<iwiiijj; cliiuensiDiis; ill luilliiiieter!- are Irmii siMtimi.-^, Ii>iigitiiiliii:il viTlical: Itiaineter unil 

 sucker 0.22, of pliaryiix 0. Hi, of acotalmluiii (niaxiiiiutii) 0.5, i>f ovary (inaxiniuni) O.-Wi, of testes 

 (inaximuin) 0.4; ova, 0.017 ami 0.012 in the two priiu'ipal iliaineters. Tliese worms liave a great 

 variety of shape and color. In some the intestine is dark-ljrown and quite conspicuous; uteruc, with 

 eggs, convoluted in middle portion of body, and)er yellow; va.s deferen.s slen<ler, thread-like, convoluted, 

 opaque white. As these distoine.s lay amiil the wa.'shings from the alimentary canal of the silverside, 

 which contained the claws and liits of the shells of slirimps, annelids, and hiack and while strips of 

 the peritoneum of their host, they were rather dilKcult to distinguish from their surroundings. 



4. Distomiim sp. Small, short, fusiform. [I'l. xxxii, (igs. 357, .3.58.] .\ug. 2S, ISdit; t;. .\ug. 30, 



1899; 2. 

 Ke.semhling I), hothryophomn Olsson, but with more slender neck ami distinct o'sophagus. 



5. DiMomnm iiilile-iiifldlum Stossieh. In gloliular cysts, in the liver (.July 17, 1900), and in fat mas.-^es 



in the body cavity (Aug. 30, 1899). The.se have .«])ines around the mouth and smaller spines 

 nil neck. See 6, i>p. 527-528, ]il. xi.vii, tigs. 10,11, and pi. xi.viil, figs. 1,2. 



Mugil cepbalus, .hnnpiug Afiilli'l. 



August 28, 1899; 21, small, 90 nnn. to 100 mm. long. July 28, 19tX); 12, small. Fish in both 

 cases from Waquoit Bay. .\limentary tracts filled with green mud, which contained large numbers of 

 diatoms, green alg;e, anocca.«ionalcoi)epod, ami muchquartzsand, in minute angular gnuns. Noentozoa 



were found. 



Sphyraena borealis, linrnirinlit. 



August 8 and 15, 1899; 8, small; remains of young tish in alimentary canal. .July 27, 190(1; 2, 

 small; intestines filled with immense numbers of young univalves, 0.15 mm. to 0.3 mm. in diameter. 

 Specimens from Katama. No entozoa found. 



Scomber scombrus, Mdihnl. 



The only food note.s 1 have are for young (ish. .Viigust 2, 1899; remains of s-nall fish. August 8 

 and 12, 1.W9; small crustaceans. July 9. 1900; small squid and copejiods. 



NKM.\TODES. 



1. Asniris. [I'l. VIII, ligs. 73, 74, and pi. xiv, figs. 181, 182.] 



Immature, probably A. ehiralu Kudolphi; collected by Mr. S. K. Meek, Fulton Market, New 

 York, from the slomai'h of a mackerel, .\iig. 30, 188<i. Length, 10 mm.; lateral al;e very prominent. 

 Probably young of .4. cluiatd, but postanal region more elongate than ii.sual in that species. On 

 May 3 and 8, 1899, 1 received from Dr. II. M. Smith about 80 specimens of neinatiHles (.l.v((iri.< sp. ) 

 taken from mackerels from the New Jei-sey coa.st — the smallest specimen about 10 mm., the others 15 

 mm. to 20 mm. in length. One only is adult — a female 40 mm. in length. One male wa-s noted with 

 a curved si>iculum, which ha<l a strong, opaque costiX and a rather broad, transparent blade. Many of 

 the smaller specimens are of the type de.stTibeil under the names Aijamonema caimilitriii and Ancarh 

 ntlixiiliirid [figs. ISl, 182]; others are undoubtedly a.scarids. K\\ are probably immature ascarids. 

 Other immature nematodes from the iieritniieiim have been collected from the macken-l. July 24. 

 1889, anil .\ug. 12, 1899. Specimens i-ollected by Mr. Meek, Aug. and Nov., lS8(i, were probably all 

 young a.scarid.s, although the cliaracteristi<' jaws of thai gc'iius have not yet developed. The longest of 

 tlu'.se measuretl 28 mm. It :igrees closely with i.eidy's description of Agamonema p<ipiUigeruii Diesing. 



