FLSH PARASITES COLLECTED AT WOODS HOLE. 279 



22. Palinurichthys perciformis, l!udil< r-Jlxh. 



(1) August 10; one, small; stomach contents not noted. An enormous number of small distoma 

 on and in the pyloric c;cca. Dixton<in puri/orme. See page 292 for description. 



(2) August 19; six; stomach contents not noted. Larval cestodes in general similar to forms 

 found in squeteague, flounder, goose-fish, etc., in intestine, Imt very snuill. Dimensions of living 

 specimens, in millimeters: Length 0.34, breadth 0.17; specimen with head invaginated, length 0.20, 

 breadth 0.14. A few small distoma, />. pyriforme, in intestine. 



Echinorhynchus prixtis, var. tenuicornis (Entozoa of Marine Fishes, in, pp. 531-532, ils. iv, 

 figs. 39-41; v, figs. 42-53); from intestine, one. 



One, small immature nematode also found, from intestine. 



(3) August 22; three; stomachs contained small univalve shells (Trittia trivitata), and the slender 

 crustacean, quite common among hydroids (f'aprcllageonietrica). Larval cestodes, and numerous small 

 distoma, as in lot examined August 10. These entozoa were from the alimentary canal in the vicinity 

 of the pyloric ca-ca. 



(4) August 25; four; stomachs contained young squid (Loligo pealii), Crustacea. Larval cestodes 

 and small distoma, as in preceding lots, olnained by opening the alimentary canal, and washing con- 

 tents in a dish of sea water. One of the former appeared to have a more prominent rnyzorhynchus 

 than usual. 



23. Rhombus triacanthus, Butter-fish. 



(1) July 21; one; stomach contents not noted, probably empty. Numerous immature uematodes 

 on viscera. 



(2) July 23; one; stomach contents not noted. One small cyst containing blastocyst and larva 

 (Rhynchobothrium}, and enormous numbers of immature uematodes on and among the pyloric cteca. 

 The combined bulk of the worms appeared to be almost equal to that of the pyloric cajca. 



(3) August 10; three; stomach contents not noted. Serous coat of pyloric caica with large 

 numbers of immature uematodes. 



(4) August 22; four; stomach contents not noted. A few small cysts and numerous small, 

 immature uematodes found on pyloric creca. 



24. Morone americana, Whit? Perch. 



August 27; three, small; stomach full of shrimps. 



Distomum areolatum Rudolphi. See page 293 for description ; rather numerous, found in dish in 

 which viscera had been lying. 



Numerous pigment patches on viscera generally, especially on liver, but also abundant on 

 mesentery, stomach, and intestine. A study of the tissue atl'ected with these patches confirmed certain 

 conclusions recorded in my Notes on Trematode Parasites of Fishes, page 537. 



Large numbers of cysts in various stages of degeneration were found. In most of them ova, which 

 are without doubt the ova of some distomurn, formed the nucleus of the cyst. These ova measured' 

 about 0.020 and 0.013 mm. in the two principal diameters. They therefore do not belong to I), areo- 

 latum. The principal steps in the degeneration of the cysts to pigment were represented by, (a) one 

 or more ova with cyst of connective tissue just beginning to form, (&) others with cyst of connective 

 tissue fully formed, (c) others with cyst and the contained ovum or ova surrounded with a waxy 

 secretion, (d) a waxy mass with no ova. visible, also masses of dark-brown, almost black pigment. 

 Sections of the liver were made, but no pathological conditions were noted further than the presence 

 of pigment patches in the serous coat, some of which contained large numbers of ova ; 6,400 estimated 

 in one patch through which sections were made, and about half of them mounted serially. 



25. Centropristes striatus, Blade Sea-lass. 



(1) July 28; one; stomach empty. The fish had been in an aquarium for several weeks. The only 

 parasites found were numerous small cysts containing larval cestodes in the submucosa of the stomach. 

 See page 301 for supplementary note. 



(2) August 5; one; stomach with a few small fish nearly digested. The fish was taken from an 

 aquarium where it had been kept for several weeks. A few cysts on the mesentery and under the 

 serous coat of the liver. One of the cysts when opened released a blastocyst to which the larval 



