350 BULLETIN OF THE BUREAU OF FISHERIES. 



NEMATODES. 



1. Small nematodes. 



1902. — July 18, fragment of ovary with segmenting ova; length 14 nun; diameter 0.5; ova 0.047 by 



0.025. Also several small nematodes in alimentary canal; in ] r condition; evidently introduced 



with food ami not in proper final host. 



2. Heterakis foveolata Rudolphi. 



1901. — July 8, 1 male; length 10 mm; length of oesophagus 1.4; diameter of head 0.21, middle 0.31, 

 at anal aperature 0. 17; distance of anal aperature from posterior tip ()..">4. In side view there were seen 

 two post-anal and three pre-anal papilla. Aug. 5, I male, in poor. condition. 



See remarks mi this genus in introduction. 



CESTODES. 



3. Rhynchobothrium sp. 



1901. — July 20, 1, an oval cyst on viscera about 5 mm. in length, glistening, translucent, thin 

 walled, tense, supplied with blood vessels. Blastocyst oval; length 5 nun.; breadth 2.5 mm.- 

 translucent, with larva visible at one end. Length of larva 5.74 mm., to base of contractile bulbs 

 2.38 mm. Bothria at rest; length 0.42 nun.; breadth 0.49 mm., with prominent, raised border, 

 emarginate posteriorly. Length of longest hooks 0.022 mm. July 25, 1 specimen agreeing with 

 above. The larva in life had a peculiar collar-like structure on the neck immediately behind the 

 head, which was probably due to unequal contraction of the tissues of the neck, as there is but a slight 

 notch taking its place in the preserved specimen. Sec No. :;, under Scomberomorus regalis. 



4. Otobothrium crenacolle Linton. 



1901. — July 8, numerous small cysts about 2.5 nun. in length under serous coat of stomach and 

 intestine. From one of these a pyrifonn blastocyst was liberated, 1 mm. in length and 0.3 mm. in 

 diameter. The calcareous bodies in the parenchyma of the blastocyst were very abundant anil 

 separable into two groups. The larger bodies measured from 0.08 to 0.11 mm. in diameter, the 

 smaller and more numerous 0.015 mm. and less, with scarcely any intermediate sizes. Aug. 5; 1 

 specimen, encysted. 



5. Synbothrium sp. See No. 10, under Cynoscion regalis. 



1901. — July 25. S elongated cysts with blastocysts and larva'. The hooks on the proboscides were 

 of different shapes and sizes, but all were more or less recurved. Jul) 27; 2 elongated cysts on 

 viscera, same type as above. Another cyst with calcareous deposit around it can not be identified on 

 account of degeneration of its contents. Aug. 2:;, 2 cysts, 1 on viscera near rectum, the other on the 

 dorsal wall of the abdominal cavity. 



6. Scolex polymorphus Rudolphi. 



1901. — July 20, 12 of these larval cestodes, obtained from the cystic duct near its junction with the 

 intestine. These resemble forms found in similar situations in Cynoscion and Paralichihys. The 

 specimens contracted freely between 4 and S nun. in length. At rest, with bothria retracted, the 

 length was about 1.2 nun. There was no indication of costse on the bothria nor of the red pigment 

 patches often noted in these larval cestodes. Aug. S; in alimentary canal. No entozoa were found in 

 the fish examined on Aug. 20 and 22. 



7. ( yst. 



1902. -July 1 8, apparently blastocyst of a Rhynchobothrium; scolex not developed. Dimensions in 

 millimeters: Length of cyst 5; diameter 2; blastocyst, length 7.5, diameter 1.5. Aug. 20, piece of 

 cestode blastocyst, but no larva. 



TREMATODE. 



s. DiMomum sp. [Fig. 209. | 



1902. — Aug. 20, 1, spinose, immature. Dimensions, life, in millimeters; Length 1.8; breadth 0.6; 

 diameter of oral sucker 0. 16, of ventral sucker 0.15; pharynx, length 0.08, breadth 0.04. This may lie 

 a young specimen of No. 4, under Symphurus plagiusa. 



