PARASITES OK FISHES OF BEAUFORT, NORTH CAROLINA. 

 Bairdiella chrysura, Silver Perch, Yellow-tail. 



387 



Date. 



August 10. 



(IISIW 12. 



August 13. 



August 15. 

 August 16. 

 August 21. 

 August 22. 



1902. 

 .Illh'14.... 

 July 16.... 

 July 17.... 

 July 19.... 

 July21_... 

 July25.... 

 July 29.... 

 August 4.. 

 August 5.. 

 August 8.. 

 August 11. 

 August 12. 

 August IS. 

 August 19. 

 August 21. 



Number oi fish 

 examined. 



Fn. .(1 notes. 



5 Small crustaceans and annelids. 



16 (small) Fish, shrimp, amphipods. and annelids. 



9 Great abundance of teeth and spines ol anm lids, and a 



few amphipods. 



2 Fish, crabs, shrimp. 



2 Shrimp. 



1 (small, 85 mm.) Annelids. 



:> .in :i II 85 Hi ii i i Food material completely digested except a minute frag- 

 ment of a shrimp and the zoaea of a crab. 



) (50 mm. or less) ... Small Crustacea. 



26 (small) shrinip, shell of Solenomya; sand in intestine. 



6 (small ) : Spines of annelids. 



do.. Shrimp and other small Crustacea Caprella, etc 



5 Shrimp. 



6 Shrimp and small gasteropo.l , Olivia I. 



5 Shrimp. 



2 ; Do. 



1 i small | Contents of alimentary canal completely digested. 



5 Shrimp and annelids. 



Crabs, shrimp, and small lamellibranchs. 



3 Cralis. shrimp. 



1 Small Crustacea. 



5 Food not noted. 



5 Do. 



1. Eehinorhynchus prislis Rudolphi. 



1902.— July 16, 2. July 19, 2. 



ACANTHOCEI'IIALA. 



July 25, 1. Aug. 12, 1. 



NEMATODES. 



2. Immature nematodes (Ascaris). 



1901. — Aug. 10, few, from body cavity; small; type found in many hosts, i. e., with slender 

 posterior diverticulum on oesophagus and short anterior diverticulum of intestine. Aug. 12, few. 

 Aug. 13, few. These are probably the same as the foregoing, although only the diverticulum of the 

 oesophagus could be made out. Posterior end of these worms acuminate. Aug. 15, few; diverticula 

 easily made out, that from the cesophagus long and slender. 



1902. — July 16, several, encysted on viscera. July 17; several, from clusters of yellowish cysts 

 on mesentery. July 21; 2. encysted on viscera. Aug. 8, 11, 18, few, and very small on each date. 



3. Immature nematodes < Ascaris). 



Type with elongated basal part of oesophagus and corrugated post-anal region. 

 1902. — Aug. 11, few, associated with No. 2. 



CESTODES. 



4. Scolex polymorphus Rudolphi. 



1901.— Aug. 12, few, small. 



1902. — July 14, these were very small and had been overlooked when the viscera were examined 

 with the aid of the hand lens. A small piece of the intestine was examined under the compound 

 microscope in order to ascertain the nature of the food, when minute parasites were noticed amid 

 the intestinal contents. These were recognized as belonging to this group of immature cestodes. 

 Dimensions when compressed, in millimeters, length 0.2, breadth 0.18. July 16, several. July 25, 

 several; Aug. 5, several, small. Aug. 21, few, minute. 



5. Cyst in stomach null. 



1902. — Aug. 11, an elongated blastocyst was obtained from this cyst, but no larva was yet developed 

 in it. 



6. Nodular cysts. 



1901". — Aug. 11, on the stomach, intestine, in the mesentery and in the substance of the liver. 

 These cysts suggested the occurrence id' sporozoa, but no entozoa of any kind were found in them. 

 Tin- fish from which they were obtained was reported by Mr. Stone to be in poor condition and to 

 have an enlarged and bloated abdomen in which there was an accumulation of serous fluid. 



