PARASITES OF FISHES OF BEAUFORT, NORTH CAROLINA. 395 



NEMATODES. 



3. Immature nematodes (Ascaris sp. I. 



1901. — July 16, few, on viscera. These belong to the type with posteriorly directed diverticulum 

 of bulbous base of oesophagus and anteriorly directed diverticulum of intestine, found in a large number 

 of fish. July 20, few. July 29, 1 small. July 30, few, very small. Aug. 26, few. 



1902. -July 18, 25, Aug. 11, 16, 18, 19, few oneachdate. Also July 31, 1; and Aug. 18, few encysted. 

 Forms with clavate oesophagus, short diverticulum on oesophagus only. 



4. Ascaris sp. 



1901. — July 11, 1 male, small. Posterior three-fourths of the length is of nearly uniform diameter 

 anteriorly attenuate; jaws [prominent, breadth nearly.equaling length, a single papilla made out on 

 each of the lateral jaws; a posteriorly prolonged diverticulum of osophagus; spicules slender; post-anal 

 region short. Dimensions in millimeters, life: Length 9, length of oesophagus 0.S4; length of diver- 

 ticulum 0.63; diameter, anterior 0.12, middled.:;;, at anal aperture 0.12; distance anal aperture from 

 posterior end 0.08; distance nerve ring from anterior end 0.24. 



5. Heterakis foveolata Rudolphi. 



1902. — July 25, 1 male, and minute specimen in cyst. See introduction for remarks on Heterakis. 



CESTODES. 



6. Scolex polymorphus Rudolphi. 



1901. — July 30, few, small, from intestine. 



19(12.— July 25, few, elongated. July 31, several. Aug. is, 19, 20, few, small. 



7. Rhinebothrium sp. 



1901. — July 29, a single specimen, immature. While this .agrees with the genus Rhinebothrium 

 there is a well-defined anterior muscular sucker, which shows relationship with the genus Eelienei- 

 bothrium. The terminal sucker, however, is a character which appertains to the larval stages of a 

 number of cestodes. (See under Opsanu's tau, 3 and 4. I 



8. Cestode larvse. [Figs. 83, 83a.] 



These larva;, much larger than any referred to No. 6, were found on several occasions, and had the 

 borders of the bothria much crumpled or frilled and the neck strongly ribbed longitudinally. They 

 were very active and changed their shape constantly. They were provided with a large terminal 

 sucker, which, if not an embryonic feature, would rather point to the genus Ech neibothrium than Antho- 

 bothrium pulvinatum, which is suggested by the general appearance of the scolex. The terminal 

 sucker was eversible and in some cases became a knob-like proboscis. 



1902.— July 17, 2. Aug. 16, 1. Aug. 19, 2. Aug. 20, 3. 



Same larva; found in Orthopristis (No. 11). 



9. Rhynchobothrium sp. [Figs. 87-92.] Cysts in body cavity. 



These are larva; inclosed in their blastocysts and encysted on the viscera, in the mesentery, etc 

 They belong to the type characterized in these notes as small, with relatively long hooks on the 

 proboscides and relatively long contractile bulbs. 



1901. — July 6, numerous on viscera; length of longest hooks 0.0.3 mm. July 12. numerous cysts 

 on viscera. July 30, several in cluster on mesentery. Aug. 5, few. Aug. 6, numerous small oval 

 cysts clustered on mesentery. Aug. 17, several on viscera. Aug. 20, 1. Aug. 26 and 31, few. 



1902. — July 7, 17. 25 and 31, Aug. 11, 16 and 18, clusters on mesentery. 



10. Rhynchobothrium tenuispine Linton. [Fig. nil.] 



1901. — Aug. 31, several larvse from blastocysts inclosed in cysts on viscera. The first of these seen 

 i were in a watch glass of sea water. They had emerged from their cysts and were everted with the 

 blastocysts still attached. The spines are exceedingly minute. 



1 1. Uhynchobothrium sp. 



Type with hooks suggesting H. plicatum. 

 1902. — July 18, 1 scolex, from cyst on viscera. 



12. Otobothrium crenacoUe Linton. 



1901. — Aug. 6, few. from cysts on mesentery associated with No. 9. 

 1902. — Aug. 11, 1. Aug. 18, encysted in mesentery. 



