38 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.55. 



The internal anatomy of this tapeworm is not described in detail. 

 In connection with the presence of the parasite in reindeer in Alaska, 

 Doctor Eansom, chief of the Zoological Division of the United States 

 Bureau of Animal Industry, will later publish a study supplying 

 a description of the internal anatomy. 



TAENIA MONOSTEPHANOS von Linstow. 1905cc, 



Sy7\onym. — Taenia laticollis Rudolphi of von Linstow, 1903w. 

 SpedfiG diagnosis. — Taenia: Head with a rostellum armed with a 

 single crown of 29 hooks. These hooks (fig. 42) are from 190 to 

 210 [J, long and are shaped like rose-thorns, the handle shortened down 

 to approximatelj'' the length of the guard or shorter. The strobila is 

 14.5 cm. long and attains its maximum width near its middle, where it 

 is 2.86 mm. wide. The segments in the middle are wider than long; 

 the terminal segments are longer than wide, 2.57 mm. long and 2.09 

 mm. wide. Mature segments are 0.99 to 1.18 mm. long and 2.25 mm. 

 wide. The lateral margin of the strobila is serrate. The genital 

 papillae are somewhat posterior of the middle of the 

 lateral margin of the segment. The calcareous corpus- 

 cles are very numerous and partly pigmented black 

 The cuticular layer is thick and is separated from the 

 medullary layer by a sheet of transverse muscles. 

 Fig. 42.— Taenia Male genitalia. — The testes lie in the medullary layer 



MONosTEPHAN- q^ \\^q scgmeut whercvcr there are no female organs; 

 enlaeged. they are 78 \}. in diameter and are surrounded by a 

 After von hyaline layer. The club-shaped cirrus pouch is 570 [x 

 long, the cirrus is 290 ]i. wide and lies free in the 

 genital sinus ( ? ) . The vas deferens is rolled in coils in the genital 

 sinus ( ? ) . 



Female genitalia. — The ovaries are fan-shaped and are composed 

 of cells 13 [X in diameter and provided with large nuclei. The vitel- 

 larium is small, elongated along the transverse axis of the strobila 

 and is composed of cells 7.8 ^ in diameter and provided with brightly 

 staining nuclei. The shell-gland is anterior of the vitellarium and 

 is 160 [J, in diameter. The vagina is 34 p. wide and terminates in a 

 receptaculum seminis 110 [x long. The median stem of the uterus has 

 numerous lateral branches which in turn send out secondary branches. 

 The eggs are thick-shelled and are 29 to 36 p. in diameter. 

 Host. — Primary: Lynx lynx {Felis lynx). Secondary: Unknown. 

 Location. — In small intestine of primary host. 

 Locality. — Russia. 



This species was first reported by von Linstow as Taenia laticollis^ 

 but as he later noted that Rudolphi's description and that of Leuckart 



