78 H. J. VAN CLEAVE 
Tegorhynchus, vew 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: Z7egorhynchus brevis, new species. 
Tegorhynchus brevis, wew species. 
(Figures 5 to 9.) 
With the characters of the genus. Body short; females 4 to 8,5 mm. long 
by about 1,; mm. in maximum diameter, males 3 to 6,; mm. long by about 
0,8 mm. in diameter. Proboscis when fully extended usually over 1 mm. in 
length and about 0,2 mm. in diameter; armed with 14 longitudinal rows of 17 
to 19 hooks each. 
Hook lengths in » for a single row of hooks from ventral surface of proboscis of o Tego- 
rhynchus brevis. 
Position in row Jbasal 2. 3 4.5 (© 7 %8) © 10! Ly .,42.5113) oA ene 
Length. .... 53, 47 .AT 35, 30..30 30 30 35 Al -A7° 53.160) 65 70s /Cnmammens 
Body spines 30 to 35 p long (Figs. 8 and 9). Embryos within body 
cavity of gravid female usually about 60 by 18 uw. 
Habitat: Numerous individuals were taken from the intestine of /a/acop- 
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 1o1t. 
A single specimen representing an undescribed species of the genus 
Atrhythmorhynchus was obtained from the intestine of Larus dominicanus 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. 
