PAEASITES OF GALVESTON BAY FISHES — CHANDLER 145 



specimen of Trichiurus leptiirus, along with the two forms of larval 

 Porrocaecum described below. The specimens from Trichiurus are 

 slightly larger than the B hap hid as carts in the anchovy, with rela- 

 tively shorter and stouter esophagus, but this might easily be ac- 

 counted for by a slightly greater age. The specimens from Trichi- 

 urus (all females) are 6.4 to 7.2 mm long, with a maximum diameter 

 of 230ju to 255ja. The esophagus is 700/a to 735/x long, with a di- 

 ameter of 110/i to 115/x; and the diverticulum is 350/^ to 375ju. long. 

 The anus is about 265/* from the tip of the tail. 



PORROCAECUM TRICHIURI, new species 



jSpeci-fic diagnosis. — Length 6.85 to 8.4 mm, with maximum di- 

 ameter of 135/* to 180/t. Head 65/* in diameter; diameter at anus 

 65/t. Tail 105/1 to 130/i long, conical, rounded at tip, and conspicu- 

 ously striated, the striations about 4/x, apart. Esophagus anterior to 

 ventriculus 875/i to 910/t long with a maximum diameter of 60/i to 

 65/1 ; ventriculus 340/!. to 415/i long and 90/t in diameter. Intestinal 

 diverticulum 530/1 to 680/t long, with diameter of 50/i to 60/t at base, 

 tapering to rounded point at distal end. Only larval forms found, 

 with boring tooth present and no development of reproductive sys- 

 tem. Enclosed in delicate sheaths. 



Ty2)e host. — Trichiurus lepturus. 



Location: — Mesenteries. 



Locality. — Galveston Bay, Tex. 



Type specimen. — U.S.N.M. Helm. Coll. no. 39539; paratypes, no. 

 39540. 



PORROCAECUM SECUNDUM, new species 



Specific diagnosis. — Length 8 mm, with maximum diameter of 

 160/t. Head 65/1 in diameter; diameter at anus 65/i. Tail 130/t long, 

 conical, rounded at tip, and conspicuously striated, the striations 

 about 4/t apart. Esophagus anterior to ventriculus 910/i long, with 

 maximum diameter of 85/i; ventriculus 820/i long and llO/i in di- 

 ameter. Intestinal diverticulum 900/t long, more bluntly rounded 

 distally than in P. trichiuri. Only a single larva found, with bor- 

 ing tooth present and no development of reproductive system. 



Type host. — Trichiurus lepturus. 



Location. — Mesenteries. 



Locality. — Galveston Bay, Tex. 



Type specimen. — U.S.N.M. Helm. Coll. no. 39541. 



Remarks. — This worm differs from the larval P. trichiu7'i in the 

 greater length of the ventriculus (which in this species is nine-tenths 

 the length of the anterior part of the esophagus, while in all of five 

 specimens of P. trichiuri it is only about two-fifths as long) and in 

 the larger size of the intestinal diverticulum. 



