4(X> 



BULLETIN OF THE BUREAU OF FISHERIES. 

 Opsanus tau, Toad-fish. 



Date. 



Number of fish 

 examine']. 



Ftiod notes. 



1901. 



July 9 



July 16.... 



July IS... 

 July 24... 

 July 26... 



August 2. 



Do. 



August 3.. 

 August 6.. 

 August 8.. 

 August 9.. 

 August 12. 

 Augusl 13. 

 Augusl 16. 

 August 20. 

 Augusl 21. 



August 22. 

 August 23. 

 Augusl '-■ 



August 29. 



August 30. 



1902. 

 July 14.... 

 July 16.... 



Ju]yl9.... 

 July 21.... 

 July 22.... 

 July 26.... 

 July 28.... 

 July 29.... 

 July 30.... 

 July SI.... 

 August 4.. 

 August 7.. 

 August 8.. 

 August 11. 

 August 16. 

 August 18. 

 August 19. 



August 20. 

 August 21. 

 August 22. 

 August 23. 

 August 26. 



l (small i 

 1 



1 (small) 

 1 



3 



11 



1 (large). 



1 



ft 



Fragments of Crustacea. 



Fish and shells of gastropods (Uyanassa, Urosalpynx, 

 Achirus (?), Trnttiu, etc.). 



Small crabs. 



( 'ml>s. 



Crabs and other Crustacea. 



1 1 1 Uyanassa (several i, Pecten, sea anemoue, small crab, 

 piece of bark, and large pebble. (2) Pieces of test and 

 spines of Arbacia a large quantity). These fish were 

 taken near the wharf at the laboratory. No entozoa 

 were found in the alimentary canal of the second. It 

 would appear that the diet of sea urchins had in this 

 case acted as an anthelmintic. 



This lot. which was taken at the breakwater near Fort 

 Macon, contained only crabs in the alimentary canals. 



Crabs and gastropods i Uyanassa and Urosalpynx). 



Fish, crabs, and gastropods. 



Lamellibranch mollusks. 



Crustacea (hermit crabs). 



Fish and Crustacea, 



Crabs;, gastropods, and sea urchin i Arbacio. >. 



Fisli and crabs, 



Fish and mollusks. 



Stomach empty; material iu intestine completely di- 

 gested. 



Fish and crabs. 



Fish. 



Fish, gastropod and lamellibranch mollusks, small stone 

 crabs. 



Fish, lamellibranch mollusks, spider crabs, and other 

 crabs. 



Spider erabs and other crabs, gastropod mollusks. 



Hermit crabs and shrimp. 



Crabs, gastropod shells (most of them with hermit crabs), 



annelids. 

 Crabs, shells, shrimp. 

 Crabs, shells. 



Crabs, shells, shrimp, Pecten. 

 Shrimp. 

 Not noted. 

 Crabs. 



Crabs (fiddler, stone, and hermit), shrimp. 

 Shrimp. 



Shrimp, crabs, gastropods, lamellibranchs, eel grass. 

 Alimentary canal empty. 

 Crabs, shrimp, sea urchin {Arbacia). 

 Crabs, shrimp, gastropods. 

 Stone crab, shrimp. 

 Crabs, gastropods. 

 Stone erabs, hermit crabs, shrimp, gastropod shells 



(Uyanassa, Urosalpynx), Arbacia (spines and test), eel 



grass. 

 Hermit crabs, spider crabs, etc., fish. 

 < 'ralis. 

 Not noted. 



Alimentary canal empty. 

 Spider crabs 



NEMATODES. 



1. Abcwtu habena Linton. 



1901. — July 9, 2, young. July 18, 1, male, length 15 nun. July 24, 1, female; ova not mature, 

 length 20 mm. July 26, 1, female; ova 65 by 45 microns. Aug. 2, 5, all males; later on same date, 2 

 adults, 1 male and 1 female; also 2 immature nematodes. The latter had diverticula to oesophagus 

 and intestine. Aug. 3, 6 in one, 2 in the other. Aug. 6, few, only 1 adult female in the lot; ova 

 segmenting. Aug. 8, 1. Aug. 9, few, young and adult. Aug. 2, 6. Aug. 13, 25, adult males and 

 females, and immature. Aug. 21, 2 large and 3 small. Aug. 22, 12, all from one of the fish, adult and 

 immature. The diverticula of an immature form with rudimentary jaws were compared with those of 

 a young worm with the characteristic jaws of tins species and found t«» agree. It would seem that a 

 great many of the immature nematodes recorded from a variety of hosts are young of this species, 

 Aug. 23, lew, small. Aug. 27, 6. Aug. 21', 5, female. Aug. 30, 6, young. 



