436 PROCEEDINGS OF THE NATIONAL MUSEUM vol.90 



able alterations, frequently invaginated, full of rather large calcareous 

 bodies, collected July 21, 1904. Length 2 mm., breadth 0.6 mm. 

 (pi. 61, fig. 14) (U.S.N.M. No. 8893). 



One plerocercus, encysted, collected August 11, 1906. 



Specimens from Urophycis chuss. — Plerocerci in cysts under serous 

 coat of intestine collected November 1, 1904. 



Genus CLESTOBOTHRIUM Liihe 



CLESTOBOTHRIUM CRASSICEPS (Rudolphi) 



Plate 61, Figfkes 15-18 



An extensive account of this species, including synonymy, is given by Cooper.^s 



The species is readily recognized by the more or less globose scolex, 

 with conspicuous dorsoventral bothria, the segmentation of the 

 strobila beginning immediately behind the scolex; the mature pro- 

 glottides often partly divided by false articulations; genital cloaca 

 median, dorsal. It will be noted that strobilae have been collected 

 from the whiting (Merluccius bilinearis) that are nearly double the 

 maximum length of 92 mm. recorded by Cooper. 



Although this cestode is recorded from nine specific hosts in the 

 Woods Hole region, its occasional or rare occurrence in most of them, 

 and the evidence of recent introduction of mature strobilae along 

 with food in at least one host {Lojihius piscatorius) , reduce the species 

 that may regarded as true host to one— Aferhiccius bilinearis. 



Specimens from Fundulus majalis. — One strobila and fragments 

 (U.S.N.M. No. 8894), aggregating 32 mm. in length, collected 

 September 6, 1913; bluish-transparent; fragments slightly macerated. 

 The killifish, along with specimens of whiting that were found to 

 harbor C. crassiceps, came from a fishtrap at Menemsha Bight. 

 The condition of the cestode fragments suggests that they had been 

 discharged from the whiting while confined in the trap and eaten by 

 the killifish. 



Measurements in balsam: Scolex length 0.73 mm., breadth 0.62 

 mm.; first segment length 0.16 mm., breadth 0.58 mm.; mtiximum 

 breadth 0.92 mm. 



Specimen from Hippoglossus hippoglossus. — One (U.S.N.M. No. 

 8895) collected June 14, 1906; length in formalin 15 mm. The 

 scolex is typical of the species, but the strongly contracted strobila 

 shows but little of the anatomy. Measurements in balsam: Length 

 13 mm.; scolex length 0.7 mm., breadth 0.84 mm.; first segment 

 length 0.07 mm., breadth 0.81 mm.; middle segments, length 0.14 

 mm., breadth 1.4 mm.; posterior segment length 0.56 mm., breadth 

 0.47 mm. 



1 niinois Biol. Mon., vol. 4, pp. 442-458, 11 figs., 1919. 



