PARASITES <)F FISHES OF BEAUFOKT, NORTH CAROLINA. 407 



L902.— July 14, 1, male. July 1(5, 12, adult. July 19, 1, female. July 21, l\ females, large and 

 small, .stouter than usual, intestine' greenish. July 20, 0. July 29, several, ova segmenting. July -III, 

 few. July 31, few. Aug. 4, several. Aug. 7, I. Aug. S, several. Aug. 11, 16, 18, several on each 

 date, large and small. Aug. 19, numerous, large and small. Aug. 20, few. Aug. 21, few, small. 

 Aug. 23, 1, female. 



Usually in the intestine near the pylorus, not infrequently in the stomach. 



2. Immature nematodes. 



Probably for the most part young of Ascaris habena. 



1901. — July 1(1, few, from alimentary canal; diverticula of intestine and oesophagus, as in many 

 different hosts; the must usual type; agreeing in thi- particular with .1. habena. Length 15 mm. 

 July 20, several. Aug. 2, 2. Aug. 0, few. Aug. 12, few; one of these immature worms, after lying 

 for twenty-four hours in water, shed the cuticular investment and revealed the characteristic head of 

 Ascaris. Aug. 20, numerous, encysted in intestinal wall. Some of the cysts were without nematodes 

 and tilled with waxy, degenerate tissue. Aug. 22, a yellowish cyst with calcareous nucleus, agreeing 

 in general appearance with those of preceding date. [Fig. 27.] The diverticulum of the intestine 

 was observed to extend halfway to the mouth, while the diverticulum of the oesophagus was longer 

 than the oesophagus. [Fig. 28.] 



L902. — July 14, 2; length 8 mm. July 16, numerous. July 21, several, different sizes. Aug. 7. 

 several, some encysted and surrounded by yellowish, granular material; several, encysted, with waxy 

 secretion. Aug.. 18, several. Aug. 20, several. 



I ESTODES. 



". Scolex polymorphus Rudolphi. [Figs. 76-78.] 



1901. — July 0, numerous in intestine and larger than I have been accustomed to see them in this 

 situation. Each bothrium was crossed by two distinct ribs (costse). Anteriorly there was a distinct 

 muscular organ like a globular pharynx, which doubtless functions as a sucker. The appearance of 

 this structure was not unlike the mouth and pharynx of a trematode. July 10, several, active; red 

 pigment present in neck, and costse on the bothria. When disturbed some retracted the bothria until 

 nearly inverted. The last part to disappear is the posterior edge of the bothrium. July 18, rather 

 numerous in alimentary canal; very active; two cost* on each bothrium. One was noticed which, in 

 addition to the two costse, carried an anterior loculus on each bothrium. It is probably a young 

 Calliobothrium. Another had the characteristic bothria of Echeneibothrium ami Rhinebolhriurn. Its 

 prominent muscular proboscis (myzorhynchus), if retained in the adult, would place it in the former 

 genus. This free larva was very much smaller than the larval Rhinebothrium, which was encysted on 

 the viscera, and abundant in this lot. (See No. 4, below. ) Length of bothria, in this larva, about the 

 same as that of its associates which have but two ribs on the bothria, instead of the numerous ribs of 

 this one, viz., 0.2 mm. Corresponding forms released from blastocysts (No. 4, below) measured about 



0.7 mm. when at rest. July 26, numerous; large, tw stse developed on bothria and two pigment 



patches in neck. Same found on three following date-: Aug. 2, few; in both lots on this date. Aug. 

 6, 23, several. Aug. 27, numerous; in intestine small; also in cystic duct, larger. Aug. 20, numerous, 

 from intestine. The largest hail bothria which resembled thoseof Calliobothrium and Acanthobothrium, 

 but without hooks. Some of the smaller also had costse faintly outlined on the bothria. Aug. 30, few. 



1002. — July 14, rather numerous in intestine, with costse on bothria but no red pigment. Julv HI, 

 different stages of development, the longest with two costse. July 19, numerous. July 21, two sizes, 

 the smaller about one-tenth the length of the larger, one curious abnormal form with three-forked 

 posterior end, very changeable. [Fig. 78.] July 22, several. July 20, few. July 28, few. July 30 

 and 31, several, large and small. Aug. 4, numerous, some comparatively large. Aug. 7, numerous, 

 small, with two costse. Aug. 11, rather numerous. Aug. 16, few. Aug. 10, specimens with red pigment 

 and two costse. Aug. .'10, several, red pigment, two costse, one specimen noted with rudimentary hooks 

 (Calliobothrium or Acanthobothrium). Aug. 21, large, two red pigment patches, rudimentary hooks. 

 Aug. 22, rather numerous, small. Aug. 26, several, of good size. 

 4. Rhinebothrium sp. [Figs. 59-74.] 



These are larval forms near /.'. flexile. They were found in 19 out of 20 lots of fish examined 

 during the season of 1001. The dates on which they were found are included between July and 

 Aug. 30. 



