CESTODES FROM FISHES — LINTON 441 



Specimens from Zygonectes diaphanus. — On July 22, 1905, 52 

 fresh-water killifishes were examined, and three scoleccs with rudi- 

 mentary strobilae were found. Measurements in balsam: Length 2.2 

 mm., breadth 0.24 mm., diameter of scolex 0.18 mm,, diameter of 

 sucker 0.11 mm. 



Genus CORALLOBOTHRIUM Fritsch 



CORALLOBOTHRIUM FIMBRIATUM Essex 



Plate 62, Figures 29, 30 



Corallohothrium fimbriatum Essex, Illinois Biol. Mon., vol. 11, pp. 275-283, 

 33 figs., 1927. 



The genus Corallohothrium as defined by Essex: With character- 

 istics of family. Scolex bears four suckers situated on anterior sur- 

 face surrounded by many irregular folds and lappets of tissue. Ros- 

 tellum, hooks, and spines absent. Neck broad, short. Vagina 

 inconstant in position, anterior or posterior to cirrus pouch. Habitat : 

 In Siluridae. Type species, C. solidum Fritsch. 



Essex described two new species of Corallohothrium: C. giganteum 

 and C. fimhriatum, from anterior portion of intestine of Ictalurus 

 punctatus, Leptops olivaris, and Ameiurus melas. 



Specimens Jrom Ameiurus nebulosus. — This cestode (U.S.N.M. 

 No. 8907) was collected by Mr. Edwards, Dr. MacCallum, and the 

 author on 10 dates from 1913 to 1918, inclusive, from horned pout 

 taken in fresh-water ponds near Quisset and Waquoit. 



May 9: 10 fishes examined, 70 cestodes found, maximum length 

 35 mm. May 11: 31 fishes examined, 60 cestodes, maximum length 

 50 mm. May 14: Number of fishes not recorded, 106 cestodes, maxi- 

 mum length 12 mm. May 24 : 5 fishes examined, 27 cestodes, maximum 

 length 20 mm. June 6, number of fishes not recorded, 12 cestodes, 

 maximum length 5 nmi. June 15: 1 fish examined, 3 cestodes, maxi- 

 mum length 3 mm. July 1: 15 fishes examined, many cestodes, 

 maximum length 4 mm. July 7: 5 fishes examined, 8 cestodes, 2 to 

 18 mm. long. August 13: 38 fishes examined, many cestodes, 3 to 10 

 mm. long. September 29 : Number of fishes not recorded, 5 cestodes, 

 maximum length 4 mm. 



Measurements in balsam: Length 32 mm.; breadth near scolex 

 1.05 mm.; segment 1 mm. back of scolex, length 0.16 mm., breadth 

 1.2 mm.; posterior segment, length 2.45 mm., breadth 1.4 mm.; 

 scolex breadth 1.54 mm., length 0.91 mm.; diameter of sucker 0.35 

 mm. Ova thin-shelled, somewhat variable, circular outline, in life 

 0.028 to 0.035 mm. 



