434 PROCEEDINGS OF THE NATIONAL MUSEUM vol.90 



Specimens jrom Lagocephalus laevigatiis. — A few small cysts, 

 habitat not recorded but probably from intestinal wall, collected July 

 17, 1906; plerocercus removed from cyst, length 1.54 mm., breadth 

 0.38 mm. 



Specimen jrom Lopbopsetta maculata. — One collected by Vinal N. 

 Edwards September 22, 1905. Length 5 mm., breadth 2 mm., in 

 formalin. 



Specimens jrom Menticirrhus saxatilis. — Two small flask-shaped 

 plerocerci collected July 19, 1910; length 2.1 mm., breadth 0.7 mm. 



Specimens jrom Microgadus tomcod. — Two slender larvae collected 

 by Vinal N. Edwards April 8, 1910 (U.S.N.M. No. 8887); length 8 

 mm., breadth 0.6 mm., in formalin. 



Specimens jrom Paralichthys dentatus. — Collected on two dates in 

 July and two in August 1905. Of the 15 fishes examined, numerous 

 cysts containing plerocerci were found in the intestine wall of one and 

 on the ovary of another; one cyst was noted in each of two fishes. 



Specimens jrom Paralichthys oblongus. — Cysts on intestine and 

 mesentery, 1 to 4 mm, in diameter, were collected on one date in 

 May, two in June (U.S.N.M. No. 8888), and two in August; few on 

 each date. These cysts contained plerocercoidlike larvae of a maximum 

 length of 4.5 mm., some of which, however, are larval tetrarhynchs. 



Specimens jrom Peprilus paru. — Collected on three dates in July 

 (U.S.N.M. No. 8889), two in August, and one in September, few to 

 numerous, on viscera in three different years. The plerocerci are 

 small, white, slender, actively contracting, from 8 mm. or less to 5 

 mm. when fully extended, often assuming a vase shape; calcareous 

 bodies rather large. Measurements in formalin: Length 1.05 mm., 

 breadth 0.29 mm. ; scolex length 0.1 mm., breadth 0.21 mm. Measure- 

 ments in balsam: Length 0.88 mm., breadth 0.27 mm.; scolex length 

 0.08 mm., breadth 0.17 mm.; length of bothrial pit 0.08 mm. Scolex 

 covered with minute spines. 



Specimens jrom Pneumatophorus grex. — Small plerocerci collected 

 from intestine on three dates in July and one in August; three fishes 

 examined on each date; 5 to 12 plerocerci found on each date, most of 

 them macerated, evidently lately introduced with food. 



Specimen jrom Pomatomus saltatrix. — One small, slender, linear 

 specimen collected August 27, 1906. 



Specimen jrom Pomolobus pseudoharengus. — One collected October 9, 

 1914. Length 5 mm., breadth 0.6 mm., in formalin. Filled with 

 relatively large glandular bodies, 0.03 by 0.07 mm., similar to those 

 noted in a larval cestode from Sarda sarda. 



Specimens jrom Poronotus triacanthus. — Small, vase-shaped plero- 

 cerci are recorded from this host on two dates in July and two in 

 August in four dift'erent years; under serous coat of stomach, extending 



