354 BULLETIN OF THE BUREAU OF FISHERIES. 



NEMATODES. 



3. Immature nematodes {Ascaris). 



1901. — July 31, 1 from viscera. The embryonic cuticle was in process of sloughing off. The 

 specimen was of the kind which lias a slender diverticulum of the oesophagus and a short anterior pro- 

 longation of the intestine — the type found in a large number of hosts both seasons. 



1901'.— July 19, few. 



CEST0DES. 



4. Scolex polymorphic Eudolphi. 



I on I -July 31, numerous. These were found in large numbers in the cystic dint, where they were 

 attached by their heads to the mucous membrane in two clusters, as noted in former papers, in the 

 squeteague. When the fish was lirst opened numerous small white bodies were seen beneath the 

 serous coat of the stomach. A piece of the stomach wall was cut out and placed in sea water. When 

 it was examined a few hours afterwards the parasites had crept out. They all appeared to he 

 N. polymorphous, hut smaller than those from the cystic duct. 



This is the only instance in which I have found these forms occupying this position. 



1902. — July 17, several; no coste nor red pigment. July 9, 22, few. July 25, several; some 

 appeared to have rudimentary segments. July 30, 31, several. Aug. 1, several. Aug. 15, numerous. 

 Aug. 16, few. Aug. 18, several; large and small together in intestine. Aug. 19, several. Aug. 20, 

 several, small. Aug. 25, few, small. 



5. Rhynchobothrium sp.; probably encysted stage of R. longispine. 



1902.— July I!', a single scolex found free in the intestine. The hooks are much like those of the 

 frequently recurring form characterized in these notes as small, with relatively large hooks. This 

 specimen had a patch of red pigment in the neck, while the blastocyst was attached to the larva. 

 0. Dibolhrium tortum sp. nov. [Figs. 119-124.] 



Scolex of tin' Monobothrium type — that is. there was no indication of bothria, even in transverse 

 sections. 



Color of body dead white; head and neck somewhat less opaque. 



Anterior end sulicylindrical or moderately compressed, sometimes spiral; when placed in killing 

 fluid there is a strong tendency to assume a spiral or twisted shape, like a cork-screw or an augur. 

 This tendency was observed to lie characteristic of all — so much so that I did not succeed in getting 

 an entire strobile free from kinks. Body proper flattened, tanseiform, nearly uniform in breadth, with 

 a tendency to break into fragments of irregular length, hut no indication of segments. The sets of 

 reproductive organs follow each other closely, and the reproductive openings lie along the median line 

 of one of the flat faces of the strobile. The vaginal opening and the posterior border of the spherical 

 cirrus-bulb are contiguous on the median line. The ovary is laterally elongated anil lies posterior to 

 the other reproductive organs of its set. The uterus lies in front of it and passes alternately right and 

 left of the reproductive aperture. Testes lateral, surrounded by the vitellaria, which occupy the greater 

 part of the periphery of the body. Dimensions, life, in millimeters; Diameter of head 0.75; breadth 

 of body 2; ova, elliptical, 0.054 by 0.036 in the two principal diameters. Approximate length of 

 strobile 45. The ova in an alcoholic specimen measured 0.045 by 0.027. 



1901.— July 31, 1 fragment, 



1902. — July 17, several, attached to mucous membrane of their host, but easily detached. July 19,3. 

 July 22, few. July 25, several. July 30, 1 or more Bcolices, several fragments of strobile. July 31, 

 several. Aug. 1, several. Aug. 7, 2. Aug. 15, 2. Aug. 10. several. Aug. 18, abundant. Aug. 10, 

 20, several fragments. Aug. 25, numerous. 



The fragments of strobile, both in life and preserved, are much folded, frilled, and twisted. 



These worms are referred to the genus Dibothrium [Bothriocephalus) provisionally. The scolex 

 would place them in the genus Monobothrium, while the general character of the strobile is that of 

 Dibothrium. 



TREMATODES. 



7. Distomum monticellii Linton. [Fig. 155.] 



1901.— July 31, 1. 



1902. — July 7, fragment. July 17,9; length 5.1 mm; general color of larger specimens red-brown; 

 smaller specimens, without ova, paler. July 19, 5. July 22, 1. July 25, 1. July 25, 12. July 50, 0. 

 July 31, several. Aug. 1. 5. Aug. 7. 2. Aug. 15, 1; probably same species as others, but more 



