4 1 2 BULLETIN OF THE BUREAU OF FISHERIES. 



NEMATODES. 



4. Immature nematodes {Ascaru). [Figs. 26, 26a.] 



The type is here recorded which is characterized in this paper as having an anterior diverticulum 

 of tin- intestine and a slender posterior diverticulum of the oesophagus, of frequent occurrence in this 

 and other hosts, usually in the mesentery. 



1901. — July 17, few. July 19, rather numerous. July 22, few, some of which proved to be young 

 ascarids. Aug. 1, few. Aug. 8, not numerous. Aug. 13, 1. Aug. 15, lew; cysts in this lot, which 

 occurred under the serous coat of the stomach appeared to be due to small nematodes. Aug. 20, 26, 

 and 28, few on each date. 



1902.— July 22, numerous. Aug. Hi, 19, few. 



5. Immature nematodes. [Figs. 31-32.] 



These belong to the type which is characterized by having an elongated bulbous basal portion of 

 the oesophagus, with no diverticulum of the oesophagus, hut with an anterior ececal prolongation 

 of the intestine. The post-anal region is transversely corrugated. 



l!Hil.— Aug. 13, 20, 21, few. 



1902.— Aug. 11, 19, few. 



o. Heterakis sp. 



This appears to be identical with "Ascaris (?) sp," from Paralichthys dentatus (Bulletin of 1". S. 

 Fish Commission for 1899, p. 481, pi. vn, Tilts. 207, 208). See also under Leioslomus, Lophopsetta, and 

 Scisenops, and introduction for remarks on Heterakis. 



L901. — July 17, 1, female, Imt not with mature ova; length 3.78 mm., length of oesophagus 0.74 mm. 



July 19, 1, female, not ing 1 condition, the cuticle for two-thirds the length being digested off; ova not 



developing; length 6.5 mm., length of oesophagus 0.74 mm. Aug. Hi, 1. female; length 5 mm.. length of 

 oesophagus 0.7 mm. In this specimen the oesophagus was constricted in the middle giving to it an hour- 

 glass shape. The specimen was first supposed to he a male, there being two post-anal papillae present. 

 In alcohol it measures 4.3 mm. The reproductive aperture was noted 1.8 mm. from the posterior end. 



1901'.— July 22, L\ females. 



7. Ichthyonema globiceps Rudolphi. [Fig. 21.] 



19(12. — Aug. 14, 1, from lower lip. Color reddish, particularly at the posterior end, and due to the 

 perivisceral fluid. Intestine dark brown. The specimen is a female with an enormous number of 

 young, which could be seen as a continuously wriggling mass through the transparent walls of the 

 hoily and uterus. Dimensions, life, in millimeters; Length 25; diameter, at anterior end 0.10, at 

 nerve ring 0.21, at anterior end of uterus 0.25; distance from anterior end to nerve ring 0.21; from 

 anterior end to anterior end of uterus 0.3; diameter of oesophagus 0.05; diameter of young 0.01. The 

 young aiv characterized by having half a dozen or less brown granular masses apparently in the 

 intestine. 



CESTODES. 



8. Scoh i polymorphus Rudolphi. [Fig. 79.] 



1001 . — July 19. numerous in cystic ducts (4' both hosts examined on this date. July 22, Aug. 8, 15, 

 numerous in cystic duct on each date. 



1002. July 7, 8, 15, few. July 16, almndant. July IS, few. large and small. Aug. 20, numerous. 



9. Cestode. 



1001.— July 17, a slender flask-shaped larva from surface of viscera. Similar to No. s under 

 Iji iostomus. 



1902. — Aug. is, cyst with larva, probably Dibothrium; length 4.5 mm.; breadth 0.7 mm. 

 Agrees with No. 7 under Lophopsetta maculata. 



10. Rhynchobothrium sp. [Figs. 95, 96.] 



These are larval forms from small oval cysts in stomach wall, most of them, if not all, belonging 

 tii tin' type designated in these notes as small with relatively large hooks anil relatively long ion tractile 

 bulbs. The hooks of this species agree closely with those figured in Larval ( lestode Parasites of Fishes, 

 pi. LXIII, tig. 7 (Proceedings of the National Museum, vol. \i\i. 



lool. -.Inly 22. several. Aug. 6, 1. This may he a different species from the foregoing, th Iges 



of the bothria being raised into a prominent border. Dimensions in millimeters; Cyst 2.8 by 1.4; 

 blastocyst 1.4 by 1 ; length of larva 1.1 [fig-. 95, 96], Aug. 20; same as those found on July 22. 



1002.- July 22, few, on viscera. 



