PAEASITES OF GALVESTON BAY FISHES — CHANDLER 143 



successful infection experiments have been performed. I can find 

 no reference in descriptions of (J. spiculigerum to the deep striations 

 in the neck re^^ion, which is a conspicuous feature of both the species 

 described above, but these striations are mentioned by Cram (1927) 

 in C. microce phalumi of ducks and ciconiiform birds and in C. 

 mici^opapillatntn of jDelicans, as well as in C. DiultipajrilJatuni of 

 South American ciconiiform birds and in C. tHcuape of similar birds 

 in Asia and Africa. Cram considers C. quadricuspe Walton a syno- 

 nym of C. microcephaly/Ill. In his description of C. quadricuspe^ 

 Walton (1923) mentions that the tail ends abruptly in a terminal 

 spine, which is also a character of C. tricuspe^ but it is neither men- 

 tioned nor figured by Gedoclst (1916) in his description oiKathleena 

 arcuata^ a species that Baylis and Daubney (1922) found to be 

 identical with Kudolphi's rmcrocephalum. G. rohustum has a termi- 

 nal papillalike structure such as Walton lioures for his C . qwadri- 

 ouspe, but the esophageal appendix is longer than in Walton's quad- 

 ricuspe and similar to the dimensions given for mwrocephalvmi. C. 

 collieri, on the other hand, has no papilla at the end of the tail and 

 has a much slenderer esophagus, shorter appendix, and shorter 

 cecum, in which respects it suggests the possibility of its being the 

 young of 0. micropapUlatum. As noted above, however, both species 

 were fed to domestic mallard ducks without resulting infection. 



AMPHICAECUM PARVUM, new species 



Plate 11, Figure 1 



Specific diagnosis. — Body small and slender, 6.7 mm long, with 

 maximum diameter of 230/a. Diameter fairly uniform for most 

 of length of body, tapering in anterior fourth and more abruptly at 

 tail end. No striations on cuticle. Head truncated, 60/a across at 

 anterior end. No larval boring spine, but mouth flanked on each 

 side by bladderlike structure, which may be forerunner of a lip. 

 Esophagus about 830ju, long, followed by a more or less spherical 

 bulb about IS^ti in diameter and a large hollow appendix 1.06 mm in 

 length. Diameter of esopliagus about 56/>i, of appendix about 

 SOfi. Intestinal cecum about 300/x, long and 60/x, in diameter. Anus 

 135|U, from posterior end. Tail conical, ending in truncated papilla- 

 like structure about lO^a in diameter. 



Type host. — Dorosoma cepediamMm. 



Location. — Intestine. 



Locality. — Galveston Bay, Tex. 



Type specimen. — U.S.N.M. Helm. Coll. no. 39535; paratype, no. 

 39536. 



Remarks. — In the possession of a posterior esophageal bulb in- 

 stead of a ventricle and of a large hollow esophageal appendix, this 



