6 PROCEEDINGS OF THE NATIONAL MUSEUM. vot^ 55. 



Strobila at least several centimeters long and composed of a head and numer- 

 ous segments, from 10 to hundreds, with a number of segments usually 

 gravid at one time. Lateral uterine branches usually distinct, at least in 

 early stages of formation. Yolk-gland posterior of ovaries and elongate or 

 triangular, with one side parallel to the posterior margin of the segment. 

 Larval stage a bladderworm with thin walls, and never containing brood 



capsules 2. 



2. Handle of large hook usually sinuous ; vagina usually shows a reflexed loop 

 in the vicinity of the longitudinal excretory canals. Larva a coenurus — 

 i. e., a bladderworm with a thin wall containing numerous scolices, and oc- 

 casionally daughter bladders, but never brood capsules Miilticeps, p. 39. 



Handle of large hook usually not sinuous; vagina straight or curved in the 

 vicinity of the longitudinal canals, but without a reflexed loop at this 

 point. Larva a cysticercus — i. e., a bladderworm containing one scolex. 



Taenia, p. 6. 



It appears difficult at the present time to write a key that will dif- 

 ferentiate between the strobilate forms of the genus Taenia and those 

 of the genus or subgenus MuUiceps. This is not surprising. A 

 coenurus for a larval stage may be regarded as a localized mechanical 

 device for reproductive purposes and need not be expected to exert 

 any noticeable effect on the strobilate morphology. It would natu- 

 rally be expected that species of this genus would show relationship, 

 but it would not necessarily follow that there would be a notable 

 departure in structure from that of the parent genus, Taenia. 



Genus TAENIA Linnaeus, 1758a. 



Synonyms. — Tenia Scopoli, 1777; Hydatigena Goeze, 1782a; Mego- 

 cephalos Goeze, 1782a; 'iPseudoechinorhynchus Goeze, 1782a; Finna 

 Werner, 1786a; Vesicaria Mueller, 1787a; Hydatula Abildgaard, 

 1790; %Baeruca Gmelin, 1790a; Hydath Blumenbach, 1797; Cysti- 

 cercus Zeder, 1800a; Alyselminthus Zeder, 1800a; Halysis Zeder, 

 1803a; Cisticercus Eudolphi, 1805a; Physchiosoma Brera, 1809a; 

 Finna Brera, 1809a; Goeziana Eudolphi, 1810a; Hydatigera La- 

 marck, 1816; Fischiosoma delle Chiaje, 1825a; Trachelocampylus 

 Fredault, 18475; Arhynchotaenia Diesing, 1850a; Halisis Goldberg, 

 1855a; Acanthotrias Weinland, 1858a; Cystotaenia Leuckart, 1863; 

 Neotenia Sodero, 1886a; Neotaenia Braun, 1894a; Gysticerhus of 

 authors; Cystizerkus of authors. 



GeneHc diagnosis. — Taeniinae : Kostellum distinct and armed with 

 a double crown of hooks, or, exceptionally, with a single (?) crown 

 of hooks. Strobila composed of fi'om 10 to hundreds of segTnents. 

 Usually large forms. Larva a cysticercus in mammals ; adult strobila 

 in meat-eating mammals. 



Type-species. — Taenia solium Linnaeus. 1758a. 



