PARASITES OF GALVESTON BAY FISHES CHANDLER 139 



irregularly shaped mass of cells. Vitellaria arranged in two narrow 

 lateral bands extending throughout length of proglottid on both 

 sides. Uterus grows out from midline in form of numerous pouches 

 separated only by wall-like partitions; pouches 20 to 30 on each side 

 extending lateralh' in vipe proglottids to vitellaria. 



Type host. — Lepisosteus osseus. 



Location. — Intestine. 



Locality. — Galveston Bay, Tex. 



Type specimen.— JJ.S.^.M. Helm. Coll. no. 39526. 



RetnaThs. — This worm differs from all other members of the genus 

 except P. amljloplith and P. australis in the size and extent of the 

 vaginal sphincter, but the musculature of this organ is ver}!' much 

 thinner than in either of these species. It differs further from both 

 these species in having a slender unsegmented neck several milli- 

 meters long. 



Three specimens of this worm were found in a specimen of Lepisos- 

 teus osseus., along with two specimens of P. australis. In one worai 

 some interesting abnormalities occurred. In a group of six mature 

 segments, three abnormalities were found. One segment had a genital 

 pore, cirrus pouch, and transverse portion of the vagina duplicated 

 on opposite sides of the segment. In this case the mass of coils of 

 the vas deferens was also duplicated, but the two transverse vaginas 

 met to form a single tube in the middle of the segment. In another 

 segment two cirrus pouches, each with its accompanying coil of the 

 vas deferens, lie one immediately behind the other on the same side 

 of the segment, but only a single vagina, anterior to the first cirrus 

 pouch, is present. In another segment the vagina opens posterior 

 to the cirrus instead of anterior, as is the case in every other instance. 



Family DILEPIDIDAE ( ?) Railliet and Henry, 1909 



GLOSSOCERCUS, new collective group of tapeworm Sarvae 



Definition. — Larval tapeworms consisting of two parts separated 

 merely by a constriction: (1) Head and neck and (2) long, slender, 

 tonguelike tail. Head provided with four suckers and armed rostel- 

 lum. Posterior part of neck with an oval cavity with a ductlike 

 extension passing into tail, where it continues as an ill-defined cen- 

 tral cavit}^ partiall}' filled with loose parenchyma. A pair of ex- 

 cretory tubes become conspicuous in posterior part of neck and pass 

 through whole length of tail, usually becoming markedly wider just 

 behind neck. Scolex retractile into anterior part of neck. Strong 

 muscle fibers pass from neck back into tail. Found free in body 

 cavity of small fish. Probably larvae of tapeworms of family 

 Dilepididae, parasitic in fish-eating birds. 



