1887.] NATURAL SCIENCES OF PHILADELPHIA. 23 



tAvo or three annuli. Genital apertures obscure. Length 8 to 12 

 inches; in alcohol contracted to 3j to 

 5 inches ; greatest width 2 mm. 



Head 0-5 to 0-625 mm. long, and 0-75 

 to 0*875 broad. Bothria 0-375 mm. 

 diameter. Commencement of body 

 ()'625 wide. Anterior segments 0*125 

 long, 0-625 wide; subsequently 0-375 

 long and 1-5 to 1-875 wide; jDOsterior ^_ 8. 



segments 0-75 long by 1 mm. wide. Fig. 7. Cephalic extremity ; 8. Seg- 



AT n J? J.1 ments near middle. 20 diameters 



number 01 specimens irom the 



stomach of the Rock Bass, Anibloplites rupestris. Lake George, 



New York. 



This species resembles the Tcenia ocellata Rudolphi of the 



European Perch, Perca fiuviatilis, and perhaps is the same. 



Taenia Micropteri. 



Head large, compressed spheroidal, with four subterminal 

 spherical bothria and a pampiniform unarmed summit; neck none; 

 body obscurely segmented, and with no obvious internal organs, 

 posteriorly variably narrowed and obtusely rounded at the end. 

 Length from half an inch to an inch, and about 1 mm. wide. 

 Apparently a larval form ; found in the body cavity of the Black 

 Bass, Micropterus nigricans. Six worms, soft, white, and active. 

 The longer ones of an inch would elongate to double the length, 

 becoming proportionately narrower. The head, about 1 mm. or 

 more in diameter, varied in length and breadth, according to 

 contraction, sometimes one and sometimes the other being the 

 larger. Lake George, N. Y. 



Last summer, while at Mt. Desert, Me., I examined a squid, 

 Omviastrephes illecebrosa, with the hope of finding the singular 

 parasite Dicyema. The specimen was in bad condition, and while 

 I found none of the latter, I obtained from it several small worms, 

 which I suppose to be the larval form of a cestode. They were 

 yet quite active, though the host was already putrescent. I 

 suspected them to belong to Tetrabothriorhynehus migratorius, 

 observed in European cephalopods, but examination showed them 

 to be different. They moved so actively and incessantly, con- 

 tracting, expanding and writhing, that it was difficult to obtain 

 a clear idea of the shape of the worm. It appears most nearly 

 related with Tcenia, and provisionally may be regarded as a 



