78 H. J. VAN CLEAVE 



Tegorhynchus, neiv genus. 



Acanthocephala parasitic as adults in the alimentary canal of fishes. An- 

 terior portion of body-proper clothed with closely set cuticular spines which 

 extend backward from the anterior extremity as an uninterrupted mantle. 

 Proboscis covered by a thick hyaline membrane beyond which the proboscis 

 hooks protrude but a short distance. Posterior extremity of body unarmed, in 

 female terminating in two short, blunt papillae (Fig. 5) between which the 

 genital aperture is located. Wall of proboscis receptacle composed of two 

 muscular layers. Brain located inside the receptacle at its anterior extremity. 

 Lemnisci long, extending about one half the length of the body cavity. Testes 

 contiguous, followed immediately by a cluster of elongated cement glands. 



Type species: Tegorhynchus brcvis, new species. 



Tegorhynchus brevis, tieiv species. 



(Figures 5 to 9.) 



With the characters of the genus. Body short; females 4 to 8,5 mm. long 

 by about 1,4 mm. in maximum diameter, males 3 to 6,5 mm. long by about 

 0,8 mm. in diameter. Proboscis when fully extended usually over i mm. in 

 length and about 0,2 mm. in diameter; armed with 14 longitudinal rows of 17 

 to 19 hooks each. 



Hook lengths in 11 for a single row of hooks from ventral surface of proboscis of d^ Tego- 



rhynchus h'evis. 

 Position in row basal 2 3 4 5 6 7 8 9 10 11 12 15 14 15 16 17 18 

 Length 55 47 41 35 30 30 30 30 35 41 47 53 60 65 70 70 70 65 



Body spines 30 to 35 [x long (Figs. 8 and 9). Embryos within body 

 cavity of gravid female usually about 60 by 18 [t. 



Habitat: Numerous individuals were taken from the intestine of Malacop- 

 terus reticulatus C. V. in Masatierra by Mr. K. Backstrom, Dec. 16, 1916. 



Cotypes are deposited in the Riksmuseum in Stockholm and in the col- 

 lection of the writer in Urbana, Illinois. 



Appendix. 



Species from adjacent mainland. 



Genus Arhythmorhynchus Liihe 191 1. 



A single specimen representing an undescribed species of the genus 

 Arhythmorhynchus was obtained from the intestine of Lams donmiicanus at 

 Talcahuano, Chile. This individual is so unquestionably distinct from any 

 previously described representative of the genus that a diagnosis is given here 

 even though a knowledge of the male and data concerning some features of 

 the female, such as the nature of the embryos, are wanting. 



