NO. 1105. PROCEEDINGS OF THE NATIONAL MUSEl'M. 



Diagnosis. Cittotcenia ctenoid (Kailliet, 1800), Stiles, 1896. Stro- 

 bila serrate may attain 80 cm. in length by 10 mm. in breadth ; composed 

 of 500 to 750 segments, which are always at least 3 to 5 times broader 

 than long. Head unarmed, about 0.44 to 0.5 mm. broad by 0.16 mm. 

 thick; no rostelluin visible. Suckers 0.176 mm. in diameter. Neuk 

 short and broad, or absent, segmentation beginning immediately back 

 of the head. Genital pores double, situated in posterior half of margin. 

 Male organs: Testicles arranged in two groups in lateral portion of 

 median field; about 60 to 80 testicles to each group, 50 to 60 it in 

 diameter. Cirrus pouch small, 0.16 mm. long by 0.128 mm. broad; it 

 does not reach the longitudinal nerve; contains the coiled and inverted 

 cirrus and a small vesicula seminalis. Female organs: Ovary, vitello- 

 gene, and shell glands agree in general with the same organs in C. 



ctinatajbutare situated much closer to the longitudinal canals; uterus 

 agrees with that of C.pectinata, but appears to be rather more simple. 

 Dorsal canal lies between ventral canal and nerve or dorsal of ventral 

 canal. Vas deferens, vagina, and uterus extend from median field into 

 lateral field dorsally of the longitudinal canals and nerves. Ova, 64 ^ 

 in diameter; bulb of pyriform body, 20 /,/. 



Hosts. European wild rabbit (Lepus cuniculus], by Riehm; tame 

 rabbit (L. cuniculus domesticm), by Neumann, Railliet, and Marchal. 



Types. Cotype, No. 1327, U.S.N.M. (from collection of Riehm). 

 Typical specimens: No. 114, U.S.N.M. (from collection of Blanchard); 

 Nos. 1449.4 and 1457, U.S.N.M. (from collection of Moniez); collection 

 of Blanchard; collection of Moniez. 



Geographical distribution. Europe: Saxony, by Riehm; France, by 

 Neumann, Railliet, Marchal, Moniez. The Azores (collection of Moniez). 



CITTOT^NIA PR^COQUIS (Stiles, 1895), Stiles & Hassall, 1896. 

 (Plate XV, figs. 1-6.) 



1895, Ctenotcenia prcecoquus [typographical error for prcecoquis], STILES, Veterinary 



Magazine, II, June, p. 345. Aug. 28, 1895. 



1896, Cittotcenia prwcoquis (STILES, 1895), STILES & HASSALL, Veterinary Magazine, 



III, p. 407. 



Prof. Herbert Osborne, of Ames, Iowa, collected two specimens of 

 tapeworms from the Pocket-Gopher (Geomys bursarius], which he pre- 

 sented to the Bureau of Animal Industry. The species is rather a 

 difficult one to interpret, especially upon press preparations, and the 

 limited amount of material does not allow a minute anatomical analysis 

 by means of sections, but sufficient characters can be given to enable 

 one to easily recognize the form. 



The specimens measure about 40 mm. long and contain about 150 seg- 

 ments ; the greatest breadth, about 5.5 mm., is reached about 10 mm. from, 

 the distal extremity; the distal 10 mm. becomes narrower. Head not very 

 ilistinct from the strobila. 0.43 nun. broad by 0.32 mm. long. No rostel- 

 lum visible; no hooks present; sticker 0.16 mm. long by 0.128 mm. broad. 



