358 



BULLETIN OF THE BUREAU OF FISHERIES. 



are blastocysts containing larvie. Fhey have doubtless penetrated the flesh from the alimentary 

 canal. When placed in sea water they were very active, extending and contracting, and assuming n 

 great variety of consecutive shapes and dimensions. The blastocyst which was sketched while living 

 measured about 8 nun. in length, about half the length being taken up with the anterior enlarged part. 

 The larva when liberated from the blastocyst is also quite active. Its length, at rest, was from 4 to 5 



mm. After the larva was removed from the Mast.. cyst the latter was ch more active than the 



.funnel-, being, in fact, altogether as active as it was before it was damaged. 



The neck of the larvse, between the bothria and the contractile bulbs, was covered with rather 

 thick and fleshy spines 0.08 mm. in length, so that the surface under lerate magnification is rough. 



The proboscides are armed with hooks of various sizes and shapes; diameter of a proboscis near the 

 base, 0.18 mm. excluding and 0.28 mm. including hooks.: length of the longest of the large recurved 

 hooks 0.14 ii mi. Other dimensions, life, in millimeters: Length 4.5;. breadth of head (marginal viev of 

 bothria) 1.4; length of bothrium 1.4; contractile bulbs, length 1.4, breadth 0.4. 



There were two varieties of these larva'. The longer kind remained firmly attached to the blasto- 

 cyst, which was not the case with the shorter kind. The posterior end of the neck is emarginate, with 

 a deep rounded notch on each side. This notch in the elongated specimens appeared to he opposite 

 the intervals between the two bothria, while in the shorter specimens it was opposite the bothria. 

 The accessory bothria] organs are small and somewhat crescentic. 



On account of the comparatively large size of these larva- it was naturally suggested that they 

 might prove to he the encysted form of the new species (0. insigne) found in the dusky shark. A 

 comparison of the proboscides of the two forms, however, makes this very doubtful. 



Tylosurus caribbseus, Gar-fish. 



COPEPOD PARASITES. 



1. Cupepod parasite. From gill. 



One from trills; same form as No. X under T. marinus; white with single median eye-spot of red 

 pigment. 



Hyporhamphus roberti. Common Halfbeak. 



NEMATODES. 



1. Immature nematodes ( Ascaris). 



Type with diverticulum to both intestine and oesophagus. 

 1902.— Aug. 11; 1. 



CESTODES. 



2. ficole.x polymorphus Rudolphi. 



Aug. 12, few, small. 



;:. ( 'estode larva. 



Aug. 16, 1; looks like young Dibothrium. 



