342 



BULLETIN OF THE BUREAU OF FISHERIES. 



Scoliodon terrae-novse, Sharp-nosed slunk. 



NEMATODES. 



1. Immature nematodes (Ascaris). 



Type with diverticulum of intestine at anterior end ami slender posterior diverticulum of eesoph- 

 agus. These, together with Nos. 2 and 3, are doubtless introduced with the food and withstand the 

 digestive action rather better than the tissues in which they are lodged, but do not become mature in 

 the shark. 



1901.— July 22, July 24, Aug. 10, few. 



1902.— July 29, few. 

 L'. Immature nematodes (Ascaris). 



Type represented by forms with short diverticulum of intestine and corrugated postanal region. 



1901. — Aug. 15, Aug. 16, few. These had evidently been introduced recently with the food. 

 3. Ascaris habena Linton (?). 



1901. — Aug. 15, fragment of a male, head missing, intestine red-brown. Two pairs of postanal 

 papilhe and 17 pairs of preanal papillae were made out. Parasite evidently introduced with food. 



CESTODES. 



4. Scolex polymorphus Rudolphi. 



1901.— Aug. 5, 1. Aug. 7. few. 



1902. — Aug. 14, several, with red pigment in neck and 2 costee developed cm bothria. 

 .">. Calliobothrium ('?) sp., young. [Fig. SO.] 



1901. — Aug. 16, 1, a scolex with rudiments of hooks. This immature scolex appears to be a 

 more advanced stage of Scolex polymorphous than I have yet found. 



6. Rhinebothrium flexile (?) Linton. 



1901. — July 22, larvae, from intestine, some not yet everted, others completely everted and active. 

 When the scolex is in motion the bothria may be extended until they are filiform, particularly at their 

 anterior ends. July 26, 1, scolex with blastocyst attached; a good view of the bothria was obtained; 

 the number of loculi on each appears to be about 32. Aug. 16, 1, scolex. This was probably intro- 

 duced with the toadfish, fragments of which were found in the intestine. 



