RESEARCHES IN HELMINTHOLOaV AND PARASITOLOGY. 223 



transversely linear, many times wider than long ; posterior segments 

 gradually becoming proportionately longer and quadrate and barrel 

 shaped; genital apertures marginal, alternating irregularly. Ova 

 spherical. 



Length from 6 to 9 and 26 inches, shortening to one half or less ; 

 breadth to 2 and 2.5 mm. Head 0.25 to 0.5 mm. broad ; bothria 

 0.125 to 0.175 mm. Anterior .segments an inch from the head 

 0.175 mm. long by i mm. broad ; posterior segments 0.5 to 0.75 mm. 

 long by 2 to 2.5 mm. broad. Ova 0.028 to 0.032 mm. in diameter. 



A single slender Scolex associated with the longest Tisnia was 4 

 nun. long by 0.25 wide, but elongated to 8 mm. by o. i wide. The 

 head was of the same form as that of the Taenia. After being in 

 alcohol, the head of the Scolex was 0.225 nim. wide, with the both- 

 ria o. I in diameter. The posterior part of the body exhibited traces 

 of segmentation, with the segments 0.075 mm. long by 0.25 wide. 



[December, 1888. No. 568. See Bibliography.] 



Food of Barnacles. — Prof. Leidy stated that la.st summer, in June, 

 walking on the shore at Beach Haven, N. J., he picked up a bunch 

 of Goose-barnacles, Lepas fascicularis, attached to a fragment of a 

 grass-stem, Spartina. Finding at the time nothing else of interest, 

 he examined the specimens, not having previously dissected a Bar- 

 nacle since 1848, when he observed the eyes in Ba/anus ritoosiis. 

 (See Proc, 184S, 9.) 



All the specimens of I.epas, of which there were nine, had the 

 body distended with a brownish-yellow Cyclops in large number, fresh 

 in appearance and generally entire. Under the circumstances he at 

 first suspected that they might be a larval form of the Lepas, though 

 aware of the fact that the cirripeds proceed from a Nauplius embr^^o, 

 which passes through a Cypris stage before assuming the Barnacle 

 condition. On further investigation he was convinced that the 

 Cyclops were food and filled the stomach. It appeared remarkable 

 that they should have been so well preserved and not crushed by the 

 strongly six-toothed mandibles of the Barnacle. Some additional 

 specimens of this species and a few of Lepas anatifera subsequentl}' 

 examined did not contain such an accumulation of similar food, but 

 usuall}' the contents of the stomach consisted from two to half a 

 dozen small gastropods with the shell, several species of entomostraca, 

 some sand grains, and a few vegetable fibers. In all the brood- 

 capsule, a thin elliptical lamina, situated between the body and the 

 shell, contained Nauplius larvae. 



