396 BULLETIN OF THE BUREAU OF FISHERIES. 



13. Tetrarhynchus bisulcatus Linton; stomach wall. 



1901. — July 6, numerous, encysted in stomach wall. July If!, 1. Aug. 26, scolices from stomach 

 wall. Aug. 31, cysts in stomach wall. The favorite lodging place of these larva- both in this and 

 other hosts is in the submucosa of the stomach. 



1902.— July 21, 31, Aug. 13, 18, 20, in stomach wall, not numerous. 



14. Synbothrium filicolh Linton. 

 From cysts on viscera. 



In all casts where these larval forms were examined they were found to belong to the type with 

 slender, straightish hooks. 



1901. — July 0, few, on viscera. July 10, 12 from one host, on viscera. July 11, 2. July hi, 

 several. July 20, 1. immature, hooks not developed. July 27, 1, cyst with blastocyst on viscera. 

 The blastocyst was 48 mm. in length. The anterior portion, which contains the larva, is usually 

 very active. It remains attached to the larva when the latter is liberated, thus contributing to the 

 developing strobile in the final host. July 29, 1. July 30, 1, an elongated blastocyst without larva; 

 probably belongs here. Aug. 20, 1. Aug. 26, 1. Aug. 31, numerous. These, as also proved for many 

 of the foregoing, were found to belong to the type with slender, straightish spine-like hooks on the 

 proboscides. 



1902. — July IS, Aug. 16, from elongated blastocysts on viscera. 



TREMATODES. 



15. Distomum monticettii Linton. 



1901. — Aug. 17, 1, an appendiculate distome, immature. The reproductive organs could not be 

 made out with certainty. Dimensions of specimen lixed over flame in water, in millimeters: Length 

 2.5; breadth 0.7; diameter of oral sucker 0.26, of pharynx 0.16, of ventral sucker 0.56. Intestinal rami 

 capacious, extending to but not entering appendix. This specimen agrees very closely with No. 

 under < 'iiimsrioii ufhiiluxttx, collected Aug. 28. 



1902.— July IS, 1. 

 lii. Distomum areolatum Rudolphi. 



1901. — Aug. 31, 1, a small spinose distome, with ventral sucker smaller than oral, (esophagus as long 

 a- pharynx, testes side by side toward the posterior end, ova larger than ventral sucker. Dimensions, 

 in millimeters: Length 0.8; breadth 0.40; diameter of oral sucker 0.11, of pharynx 0.04, of ventral 

 sucker o. os; ovum 0.120 and 0.064 in the two principal diameters, another 0.115 and 0.078. Small 

 oval bodies an- present, probably in excretory vessel, which might be mistaken for ova in a worm in 

 which no ova an' present. Aug. 0. 1, immature; probably belongs here. 



1902. — Aug. 11, 1; Aug. 10. 2; Aug. IS, 12. Some transparent as if macerated, others yellowish 

 and nearly opaque until flattened, densely clothed with spines. 

 17. Distomum tenue Linton. 



1901. — July 10, 22. General color of the greater proportion yellowish brown, occasioned by the 

 vitellaria and intestine, lighter colored anteriorly and along median line; of various shapes, but most 

 of them oblong-linear. Dimensions in millimeters: Lengths 1.44, 2.3, and 3: breadths of same three 

 0.58, o.oo, and 0.44; ovum 0.09 and 0.048 in two principal diameters. Double row of spines around 

 mouth; body covered with scales. July 27, 3. Aug. 6, 1. This specimen appears to belong here, 

 although spines around mouth are wanting. Dimensions in millimeters: Length 5.5; diameter, uni- 

 form from ventral sucker to posterior end, 0.7; diameter oral sucker 0.11, ventral sucker 0.35, pharynx 

 0.35 in length by 0.25 in width; ovum 0.088 ami 0.04s in the two principal diameters. Aug. 26, 1. 

 Aug. 31, 3. 1 large, 2 small. 



1902. — July 17,7). .Inly 18, few. Aug. 10, 18, 20, 1 on each date. Aug. 19, 4. Some long and 

 slender: length 7.5 mm.; breadth] nun.; others smaller; length 2.5 mm.; breadth 0.3 nun., the latter 

 without ova, some without spines. 

 is. Distomum dentatum Linton. 



1902. — July 31, 1, immature. Aug. 11, few. 



10. Dislmiiiini ralil,- iiilliltm il Stossicll. 



1902. — July 7, 1, encapsuled. This is probably the young of adult forms like Nos. 17 and IS. 



