PROCEEDINGS OF THE NATIONAL MUSEUM. 181 



T>i(if/nosis. — CUfotiViiid ctenoides (I'liilliet, 1800), Stiles, 180G. Stro- 

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

 of r>00 to 750 segments, which are always at least o to 5 times bioader 

 than long. Head unarmed, about 0.44 to 0.3 mm. broad by 0.10 mm. 

 thick; no rostellum visible. Suckers 0,170 mm. in diameter. ISTeuk 

 short and broad, or absent, segmentation beginning' immediately back 

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

 jNIale organs: Testicles arranged in two groups in lateral ]»ortion of 

 median field; about 00 to 80 testicles to each group, 50 to (50 // in 

 diameter. Cirrus i)ouch small, 0. 10 mm. long by 0.128 mm. broad; it 

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

 cirrns and a small vesicula serainalis. Female organs: Ovary, vitello- 

 geue, and shell glands agree in general with tlie same organs in C. 

 l)ectin<tta,hntiive sitnatedmuch closer to the longitudinal canals; uterus 

 agrees with that of C. pecUnata, 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, 04 // 

 in diameter; bulb of i)yriform body, liO //. 



Hosts. — European wild rabbit {Lepus euniculus), by Riehm; tame 

 rabbit {L. cunicHhis <lo7nesfk-us), by Neumann, Iwailliet, and ^larchal. 



Types.— Gotyi)e, No. 1327, U.S.N.M. (from collection of Kiehm). 

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

 Nos. 1449.4 and 1457, K.S.N.IM. (from collection of Moniez); collection 

 of Blanchard; collection of Moniez. 



Qeographical (listribution. — Europe: Saxony, by Riehm; France, by 

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



CITTOTiENIA PRiECOQUIS (Stiles, 1895), Stiles & Hassall, 1896. 

 (Plate XV, tio-s. 1-6.) 



1895, Ctenofa'iria prcrcoqiius [typograiihical error lor pracoqiiis], Stiles, ^'eterilla^y 



Magazine, II. .Im^e, p. 345. Aug. 28, 1895. 



1896, Cittotcenia prcccoquis (Stiles. 18 '5), Stiles & Hassall, Veterinary Magazine, 



III, p. 407. 



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

 tapeworms from the Pocket-Gopher {Gmmijs bnrsarius).^ which he ])re- 

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

 difficult one to interi^ret, especially upon press jireparations, 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 i:>.5 mm., is reached about 10 mm. from 

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

 distinct from the strobila. <».4."> iiiiii. broad l)y0..32 mm. long. No i-ostel- 

 lum visible; no hooks i)reseiit : mucker 0.10 mm. long by 0.128 mm. broad. 



