346 



BULLETIN OF THE BUREAU OF FISHERIES. 

 Raja leevis. Burn/lour Skate. 



The specimen obtained on Aug. 14 was collected by the Fisheries steamer Fish Hunk, station 7310. 

 in 18 fathoms, off Cape Lookout. 



CESTODES. 



1. Acanthobothrium paidum l.inton. 



1902. — Aug. 14, 10, with free segments. Length, in 5 per cent formalin, 10 mm. Strobiles, 

 especially the smaller ones, lanceolate. Aug. IS; 2. 



Dasyatis say, Sting Hay. 



All the rays were small, not varying far from 1 foot in length. 



AC 'ANTIIOCEI'lIALA. 



1. Echinorhynchus prisHs Kudolphi. 



1902. — July 29, 1, female; probably introduced with food. 



CESTODES. 



2. Echeneibothrium sp. [Fig. 82.] 



1902. — Aug. 26, 1 scolex. The muscular proboscis (myzorhynchus) was very prominent, being 

 thrust out while the worm was active, until its length was fully equal to that of a bothrium. The 

 latter were leaf-like with crenate borders as in Spongiobothrium; water-vascular system conspicuous; 

 two sinuous vessels near each lateral margin. 



3. Anthobolhrium pulvinaium Linton. [Fig. 125.] Spiral valve. 



1901. — July 6, 2 and a fragment, longest specimen 50 mm. in length, variable in life. July 8, 

 17 obtained from five rays. July 9, 14 from one ray. Brief note is here made of the extraordinary 

 diversity of form assumed by the bothria of the living worms. A bothrium when expanded and 

 attached to the bottom of the dish is a nearly circular, thin and transparent disk. When so expanded, 

 which is a form not usually assumed under ordinary conditions, the appearance is that of a peltate 

 leaf. The edges may then roll in upon each other, and, the central portion contracting, there results 

 a pyriform bothrium, the anterior end becoming more or less elongated. Sometimes the anterior end 

 elongates into what looks like an auxiliary auriculate appendage. In some cases, especially when 

 placed in fresh water, the bothrium becomes finely wrinkled or cushion-like and roseate. This is a 

 rather common form and was the one assumed by the specimen which was first studied by me. 



