348 



BULLETIN OF THE BUREAU OF FISHERIES. 



only Bpeciea of entozoa found in the seven rays examined on this date. Aug. 18, 1. Small rays, as a 

 rule, have few parasites. 



12. Acanthobothrium paulum Linton. Spiral valve. 

 1901.— July 8, 2. 



1902. — July l"J. numerous. Aug. 16, 1. Aim. L'f,, numerous. 



13. Rhynchobolhrium tumidulum Linton. Spiral valve. 



1901. — July 12, 1 seen among the numerous other small cestodes (No. 5, above). 



14. Rhynchobolhrium hispidum Linton. [Fig. f 146.] 

 1901.— July 22, several; length 4.34 mm. 



1902. — Aug. 16, 18, 20, few on each date. Aug. 26, a very few noted in dish with the very abun- 

 dant RMnebothrium sp. (No. 5) and Acanthobothrium paulum. There is red pigment usually present in 

 this species, and since there is a small patch of this red pigment on each of the four proboscis sheaths 

 and at the same level on each, it follows that two spots of red pigment are seen in any position in 

 which the worm chances to lie. 



15. Rhynchoboihrium tenuispine Linton. 

 1901.— July 24, several. 



1902. — Aug. 16, several. Aug. 18, few. These had comparatively strong spines on the neck, and 

 on that account the name hispirhtm would be more fitting for them than for the individuals referred to 

 No. 14. The proboscides, however, are armed with the characteristic minute hooks of this species. 

 One case was observed where the proboscides were retracted so powerfully as to draw a considerable 

 portion of each into the contractile bulb. 



16. Rhynchoboihrium sp. [Fig. 131.] 



1902. — July 22. 1, scolex and first segments. This specimen had a narrow transverse band of red 

 pigment behind the contractile bulbs. The retractor ribbons were unusually broad, each composed 

 of a number of longitudinal fibers and originating from the posterior end of the long contractile bulb. 

 Hooks of various shapes. Dimensions, life, compressed, in millimeters: Length of head and neck 8, 

 of head alone 0.8; breadth of head 1.4; diameter of neck, behind head 0.7, at bulbs 1, behind bulbs 0.4; 

 length of bulbs 3.46; diameter of bulb 0.22; distance from bulbs to first segment 0.7; length of first 

 segment 0.11, breadth 0.45. Transverse stria' begin 0.4 mm. behind the bulbs. 



17. Cysts. 



1902. — July 8, 1 in liver, 2 in walls of intestine. These were rilled with waxy degenerate connective 

 tissue, and represent parasites winch had been lodged in the tissues of their host for a long time. 



TKEMATODES. 



18. Distomum vitellosum Linton. 



1902. — Aug. 20, 1, small and active, no ova. 



Pteroplatea maclura, Butterfly Ray. 



Number of fish 

 examine!. 



Food notes. 



July 9. 

 July 12 



July 15... 

 JulySl... 



AugUSt !. 



1902. 

 July7.... 

 July 11... 

 Jul v 17. . . 

 Julj 18... 

 July22... 

 July 29... 

 July31. 



i (small) 

 2 



■2 ismall) 



2 (small) 



1 (small) 



2 (small) 

 5 



■2. 



1. 



August 4 1. 



August 11. 



AUL,'llst ]'.! 



August 20. 

 August 21 . 

 August 22. 

 lugust 26. 



Contents of alimentary canal com- 

 pletely digested. 



Fish instomach; fragments of Crusta- 

 cea and annelids in intestine. 



Alimentary canal empty; no entozoa. 



Only mucus in alimentary eanal. 



Crystalline lens of small fish; sand. 



Shrimp. 



V t i ipletely digested; in 'entozoa. 



Fish; no entozoa. 

 Fish. 



Fragment-- of Soli nomya in one. 

 Material digested. 

 Fragments of an annelid. 

 Alimentary canal empty; no entozoa. 

 Fish; no entozoa. 

 Fish (black sea bass). 

 Fish, lamellibrancbs. 

 small Crustacea, megalops, copepods. 

 Fish; no entozoa. 

 Do. 



