154 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 83 



placed in the genus ArhythmorhyncJnis. It seems probable that 

 the immature forms of Arhythmorhynclius found in the body cav- 

 ities of their second intermediate hosts, frogs or fishes, differ from 

 the adults in the relatively undeveloped condition of the posterior 

 part of the body, which presumably elongates after the parasites 

 have reached the intestines of their definitive hosts. The four 

 cement glands of these young forms may possibly fuse into two 

 when they elongate in the adults, but it is more probable that in the 

 adult worms the attenuated glands, closely applied to each other, 

 have not had their number accurately determined except in the 

 case of A. fusciis. A similar error has been made in the case of 

 Gorgorliynclms medius (see Chandler, 1934), and it would seem 

 advisable to reinvestigate the number of the cement glands in the 

 genera Centrorhynchus and Prosthorhynchus. 



GORGORHYNCHUS GIBBER Chandler, 1934 



This species was found for the first time in two of three specimens 

 of the marine catfish {GaleichtJiys felis) at Bolivar Point near the 

 entrance from the Gulf of Mexico into Galveston Bay. It is a 

 form close to Echmorhynchus medius Linton, 1907, adults of which 

 were found only in Mycteroperca apua^ although encapsuled imma- 

 ture specimens were found among the viscera of a number of spiny- 

 rayed fishes. Linton's species was transferred by me (1934) to a 

 new genus Gorgorhynchiis^ of which the present species, G. gibber, 

 was made the type. 



RHADINORHYNCHUS TENUICORNIS Van Cleave, 1918 



This species, Avhich Linton has recorded from a large number of 

 species of marine fishes, was found in about 75 percent of the 

 croakers (Mlcropogon undulatus), in two of three "spots" {Leio- 

 stonmis scant htonis), and in one thread-fin {PoJynemus octonenius) 

 taken in Dickinson Lake in the lower part of Galveston Bay, but 

 it was not found in any of seven croakers or three spots taken in 

 the upper reaches of the ba3^ I have published elsewhere (Chand- 

 ler, 1934) a more complete description of this parasite than has 

 hitherto been available. 



