898 



BULLETIN OF THE BUREAU OF FISHERIES. 



PARASITIC COPEPODS. 



Anchorella sp. 

 1902.— Aiij,'. 20, 2, from gills 



Menticirrhus americanus, Whiting. 



In 1902, 22 fish, all small, were examined from July 18 to A.ug. 20. 

 branchs, ami shrimp found in alimentary canal. 



Annelids, crabs, lamelli- 



ACANTIKICEPHALA. 



1. Echinorhynchus pristis Rudolphi. 



1901. — July I'll, 1, female. July 30, 2, females; yellow, length 20 and 22 mm. Aug. 1,2, male 

 and female. Aug. 24, 12. 



1902.— July 23, 3. July 31, 1. Aug. 1. I. Aug. 15, 3, small. 



NEMATODES. 



2. Immature nematodes ( Ascqris sp.). 



1901. — July 20, nematodes belonging to the type which have a slender diverticulum directed pos- 

 teriorly from the bulbous base of the oesophagus and an anterior prolongation of the intestine. Dimen- 

 sions of living specimen, slightly compressed, in millimeters: Length 7.2; length of oesophagus 0.77, of 

 diverticulum of intestine 0.21, of diverticulum of oesophagus 0.77; diameter, nearly uniform, 0.22; dis- 

 tance from anal aperture to posterior end, which tapers to an acute point, 0.32. On viscera, some 

 encysted. July 30, 2. July 31, few. Aug. 1, not abundant; from capsules on viscera. Aug. 6, few. 

 Aug. 24, few. 



1002.— July IS, few. 



3. Nematode. 



1901. — July 20, slender bodies which appear to be fragments of the ovary of Tchthyonema in material 

 from intestine. These exhibit moderately active contractile movements. One piece was about 4 mm. 

 in length and o.ll mm. in diameter. It was completely filled with elliptical ova 44 by 27 microns in 

 the two principal diameters. In some of these ova young nematodes had already developed. 



-,. Scolex polymorphui Rudolphi. 



1901. — July 20, few, from intestine; rather larger than usual for these larval cestodes when found 

 in the intestine of their host; red pigment present; terminal sucker very much smaller than bothria. 



July 31, several, rather large, 2 red pigment patches, 2 costae on tin- bothria; also some small. Aug. 

 6, few. 



1002.— July 31, few, small. 



.">. Rhynehobothrium sp. 



1001. — Aug. 1,1, larva released from blastocyst which was inclosed in a fusiform cyst. Dimensions 

 in millimeters: Length 3; length of bothria 0. 17, head and neck to base of bulbs 2; length of con- 

 tractile bulbs 0.36; diameter of head 0.2S. of neck 0.14; length id' longest hooks 0.01. Bothria and 

 neck to base of bulbs thickly beset with minute bristles. The hooks suggest A', plieatum. 



