;# 



DIOCTOPHYMOIDEA 235 



Ancyracanthus. Railliet (1916) suggests placing Ancyracan- 

 thopsis and Ancyracanthus in a family Ancyracanthidae. No 

 diagnosis is given either of the family or of the genera. 



c. Elaphocephalus Molin, 1860. 



Cuticle of body spinj^ Four external cephalic appendages 

 present, as in Ancyracanthus, but each with a shorter sub- 

 sidiary process. Four cervical sacs present. 



Hab. At base of toes of a Macaw (one species known). 



Genotype : E. octocornutus Molin, 1860. 



Molin, 1860, Sitz. k. Akad. Wiss., Wien, xl, 343 ; v. Drasche, 

 1884, Verh. k. k. Zool.-Bot. Ges., Wien, xxxiii, 113; Baylis & 

 Lane, 1920, Proc. Zool. Soc, London, 306. 



Appendix to Filaeioidea. _ 

 a. Haplonema Ward & Magath, 1917. 



Head without lips or papillae. Cervical alae present. No 

 buccal capsule. Oesophagus in two portions. Tail of male 

 without alae. Two pairs of preanal and three pairs of postanal 

 papillae present. Spicules equal. Apparently no accessory 

 piece. Vulva in middle region of body. Uterine branches 

 opposed. Oviparous. 



Hab. Intestine of a fresh-water Fish (one species known). 

 Genotjrpe : H. immuiatiim Ward & Magath, 1917. 



Ward & Magath, 1917 (1916), Journ. Parasitol., iii, 61. 



b. Ascarophis van Beneden, 1871. 



Syii. Ascaropsis Power & Sedgwick, 1880. 



Body relatively elongate, of uniform girth. Cuticle, except 

 at extremities, with prominent annulations. Head with two 

 small, forwarcUy-projecting spines. Lips paired, small. 

 Oesophagus long. Male undescribed. Anus of female in a 

 ventral depression. Tail short and conical. Vulva apparently 

 anterior. Genital tube apparently single, posterior. Ovi- 

 parous. Eggs with two filaments at one pole. 



Hab. Intestine and pyloric caeca of marine Fishes. 

 Genot3rpe : A. morrhuae van Beneden, 1871. 



van Beneden, 1871, 3Iem. Acad. Roy. Sci. Belg., xxxviii, (4), 

 92 ; NicoU, 1907, Ann. Mag. Nat. Hist., (7) xix, 92. 



Order IV. DIOCTOPHYMOIDEA Railliet, 1916. 



Body sometimes spiny. Each of the four muscular fields 

 divided longitudinally into two by the insertion of extremely 

 well-developed suspensory muscles of the alimentary canal. 



