﻿26 PROCEEDINGS OF THE NATIONAL MUSEUM vol. loo 



respectively, 87, 350, 185, and 65 bdellourans, chiefly about the bases 

 of the legs — an average of 172 per individual. Also approximately the 

 following numbers of egg capsules were found, chiefly on the gill 

 hooks : 800, 500, 400, and 600 — an average of about 575 each. 



Order Polycladida 



EUSTYLOCHUS ELLIPTICUS (Girard) 



On June 24 twenty-five burrows of Upogehia afjinis (Say) were ex- 

 amined, and three specimens of this worm were found. 



STYLOCHUS ZEBRA (Verrill) 



On August 5, in a trawl off Fort Macon at a depth of about 40 

 feet, seven specimens of Pagurus poUicaris Say were examined, and a 

 single Stylochus was found in the shell of one. 



Class TREMATODA 

 Order Monogenea: Suborder Monopisthocotylea 

 Family DACTYLOGYRIDAE : Subfamily Tetraonchinae 



ANCYROCEPHALUS CHAETODIPTERI. new species 



FiGtrBE 6, a-c 



Body elongate, 0.70 to 0.97 mm. long and 0.10 to 0.18 mm. wide, 

 width about uniform throughout; anterior end truncate, with three 

 pairs of lateral glandular organs, six pairs behind these that are not 

 marginal, and two pairs of eyes. Haptor not sharply separated from 

 body, 0.48 mm. wide, with two pairs of large hooks and six pairs of 

 minute booklets; two cuticular bars support the large hooks, these 

 lying near the bases of the large hooks (fig. 6, 6) . The large hooks are 

 nearly equal in size; the dorsal pair is sickle-shaped and constricted in 

 the middle ; the ends of the dorsal bar are somewhat bent posteriorly, 

 and there is a median constriction ; the ventral bar is spindle-shaped 

 and also has a median constriction. Mouth aperture ventral, just 

 posterior to second row of head glands, 0.05 mm. long by 0.042 mm. 

 wide. Eyes anterior to pharynx. Genital aperture median, about 

 0.022 mm. from anterior end. Cirrus tubular, curved, about 0.015 mm. 

 long. Testis ellipsoidal, 0.09 mm. long, just posterior to middle of 

 body. Ovary median, ovate, pretesticular, about as long as testis. 

 Vitellaria extend along lateral margins and across body posteriorly 

 from middle of pharynx to within one-eighth of body length from 

 posterior end. Vagina lateral, opening two-fifths of body length from 

 anterior end. 



Host. — C haetodipterns fdber (Broussonet). 



Type.—\]. S. N. M. Helm. Coll. No. 36959. 



