a 
[37] ENTOZOA OF MARINE FISHES OF NEW ENGLAND. 489 
length of the specimen, when stretched out by fastening one end with a 
needle to the bottom of the dissecting dish and removing all kinks and 
curves with a fine brush, was 170™™. The length of the same speci- 
men, after having been preserved in alcohol, is less than 90™™. The 
specimen when first obtained and placed in sea-water was quite active. 
The body was constantly throwing itself into sinuous curves, while the 
head and neck were jerked from side to side with a moderately rapid 
motion. In addition to these movements the neck and anterior por- 
tions of the body constantly changed their shape by the inflation or 
dilatation of the investing membranes into wide transparent folds, con- 
stricted at irregular intervals by narrow transverse bands. The neck, 
meanwhile, was alternately stretched out and contracted like the body 
of a Nemertean. The anterior end of the head protruded into a pro- 
boscis-like papilla. The breadth of the head itself varied from 0.17™™ 
to:0.35™™, 
In the alcoholic specimen the dilatable folds of the neck are much 
contracted and broken. They lie in rough, ragged frills along each side 
of the dark central part of the strobile. The head is truncate or blunt 
in front. The neck immediately behind the sucking-disks is almost as’ 
wide as the head, flat, thin, and little, if at all, tapering. 
The following measurements were made on the living specimen. The 
head and neck changed their position and shape so rapidly that it was 
with the greatest difficulty that trustworthy measurements could be 
made : 
Millimeters. 
PaearernnInnenaa. Soe 2a OSU, See eUe Pak SP ke 0. 28 
De EPeE Or SCCUABULA TL) 165.5) coe s Kk eu} 2h). ns sulaed setae & sheds degda stele J 0.12 
PMaIBOLeE OG Neck, NAaTTOWeSsh: Palt= 20.455 m0 «nek wacmiee( dacs usiekwowlu di npecdeodt 0. 20 
PLanee OF frst Sexments trom: BORG. 5... 2. 6 janie nemnie- aH onde saeBeeie he aaeiee 17.00 
Length of fourth segment from end of strobile.............. 2.2.22. ---0------4- 1.30 
EM IMONEAHIG, POBSLOLION ONG cotes ae oe 20 eos wok oss ceamns ote ete ceeds 1.50 
Eaeanenrof saine, anterior ends i: JO) 32.13. OCU ee Se ee 1. 60 
eaech of posterior seeimtent. = 229252602 221. 3. fase pes) 2 2). ee ee Ren 
Breadth of same, posterior end...-- --...-----,..«. dinieisy ot diets alae eiaep eee yuna 0. 60 
Dea LALOE SAME, ATLOLLOl CNG. 2 «sac jo 2 o/s swaps e mute 2a Sone, wesc ne samees Seeseee LBOh 
Habitat.—Common Kel (Anguilla vulgaris); intestine; Wood’s Holl, 
Mass., August 26, 1885; one specimen. 
Von Linstow (Compend. der Helminth., 1878) records but two Teenie 
from the Common Eel, 7. macrocephala Creplin and T. hemispherica Mo- 
lin. T. dilatata is very different from the former. Diesing (Revis. der 
Ceph., Ab. Cycl., p. 378) mentions the latter, but gives no enumeration of 
characters. I do not have access to Molin’s paper, and cannot, there- 
fore, say whether 7. dilatata is identical with his species or not. The 
peculiar inflated character of the neck suggests 7. ambigua Dujardin, 
but the difference in size between the adult specimens is alone sufficient 
to render their union in the same species impossible. 
