PARASITES OF GALVESTON BAY FISHES — CHANDLER 153 



about five or seven transverse rows of 50 to 60 spines each ; posterior 

 band of 10 to 13 transverse rows of 80 to 90 spines each. Spines all 

 about 20ju, long. Anterior band ISO/t to 200/^ broad, posterior band 

 180/* to 300/i broad, separated by distance of about 75/a to 150jLt. 

 Proboscis sac very large, 1.45 to 1.75 mm long, with diameter of 

 250/* to 300/x. Lemnisci not recognizable. Testes just behind pro- 

 boscis sac in posterior part of broad region of body, close together 

 or separated by less than 75/i, with diameter of 135/x to 145/*. Cement 

 glands four, long and slender, extending from testes to near posterior 

 end of body (about 1 mm). 



Host. — Paralichthys lethostigmus. 



Location. — Body cavity. 



Locality. — Galveston Bay, Tex. 



Tyye specimen. — U.S.N.M. Helm. Coll. no. 39551; paratypes, no. 

 39552. 



Reinarhs. — One of two specimens of Paralichtliys lethostigmus 

 examined contained eight immature specimens of this worm, attached 

 to the mesenteries. The worms are in all probability the young of a 

 species that matures in a fish-eating bird. Another form of strik- 

 ingly similar general appearance, A. hispidus, was described by 

 Van Cleave (1925) from a Japanese frog; it has been suggested by 

 Fukui (1929) that A. fuscus Harada, 1929, obtained from Japanese 

 night herons, may be the adult of this form. More recently Dollfus 

 (1929a) has described an Arhythviorhynchus {A. silwicola) from 

 two African catfishes, but I have not had access to this paper. 

 Witenberg (1932) has erected a new genus, Southwellina^ with Van 

 Cleave's A. hispidus as type. This genus is differentiated from 

 Arhythmorhynchus by the spindle-shaped instead of cylindrical body 

 and by having four instead of two cement glands. Since Van Cleave 

 omits any reference to the cement glands in A. hispidus^ Witenberg 

 must either have re-examined Van Cleave's material or have ac- 

 cepted A. fmcus as a synonym of it. However, A. fuscus has the 

 typical Arhythmorhynchus body form. I have seen no reference in 

 the literature to the number of cement glands in members of the 

 ;genus Arhythmorhynchus other than in A. fuscus., which has four. 

 Liihe (1911) merely describes the cement glands as " auserordent- 

 lich lang und diinn, fadenformig ", but his figure of A. frassoni sug- 

 gests more than two glands. Van Cleave (1916) in a revision of 

 the genus in which he describes two new species, repeatedly refers 

 to the cement glands as long and slender but makes no mention of 

 their number. 



In my opinion the genus Southwcllina cannot be considered valid 

 in the present state of our knowledge of these forms; therefore the 

 •species here described, which would fit that genus perfectly, is 



