NO. 1105. PROCEEDINGS OF THE NATIONAL MUSEUM. 203 



with a double row of books 20 /< loug, about 60 books in eacb row. 

 Suckers coiuparatively large, 0.25 inni. in dianieter, armed with nnnier- 

 ous books of varions sizes, tlie prongs of tbe longest attaining 10 // in 

 lengtb. These books are arranged in about 7 to 9 concentric rows con- 

 taining abont 750 (estimated) books of various sizes. Neck short and 

 thin, 0.8 nnn, long by 0.48 mm. broad. Anlage of the genital organs 

 appears about the one hundred and seventieth segment. Genital pores 

 irregularly alternate situated in tbe middle to near the proxim.al i)or- 

 tion of the margin, cirrus anterior to vagina; cirrus pouch small, 0.12 

 to 0.14 mm. long by 44 to 04 // broad, muscular layer may attain 12 to 

 20 // in thickness. Testicles occupy almost the entire median field 

 exce])t the center portion in which tbe female glands are located. Eggs 

 are arranged in egg capsules, about IGO visible from one surface of tbe 

 segment and measuring 0.112 to 0.118 mm. in diameter; 3 to 15 ova 

 measuring 20 to 24 /< in diameter in eacb capsule. 



Hosts. — Eastern Jackass Hare {Lcpiis melanotis) by Tallichet and 

 IsTorgaard; cottontail (L. sylvatkns) by Curtice, llassall, and Stiles; 

 intermediate bost unknown. Several specimens found in collection of 

 Leidy, but collector's name is not stated on label. 



Types. — Description taken from four strobilte with beads, and several 

 fragments. Bureau of Animal Industry Cestode series No. IKK! desig- 

 nated as type and deposited in the United States National Museum. 

 Paratypes distributed as follows : Collection of Bureau of Animal 1 ndus- 

 try; Berlin Museum; collection of li. Blanchard. Fragments to South 

 Kensington Museum and Vienna Museum. Technique of type specimen 

 (poorly preserved), alcohol, bteinatoxylin. 



Geographical (Jistrihntion. — United States of North America; Texas 

 (by Tallichet and Norgaard);? (by Curtice); Maryland (by Hassalland 

 Stiles). 



GENERAL REMARKS. 



Several interesting problems arise in connection with the adult ces- 

 todes described above and allied forms, to which it may be well to 

 draw attention, notwithstanding the fact that the data at band are 

 not so complete and satisfactory as might be desired. 



The uterus: Comparing the uteri of tbe known forms of the Anoplo- 

 cephalime (exclusive of Stilcsia), we lind at least three distinct types 

 represented in both tbe single-pored and the double-pored genera. 



I. The most simple uterus ajipears first as a simple transverse tube 

 extending across tbe median field of the segment, as in Anoplovephala. 

 This same type of uterus is evidently found (see Meyner) also in Bcrtia 

 mucronata and Bertia conferta. In the double-pored genus Cittotamia 

 tbe anlage is generally single, but in some cases (C variabilis) it may 

 be single or double (divided) in tbe same strobila. 



Tbe increase in the size of this type of uterus takes place by an 

 expansion of the uterus at certain points, giving rise to proximal and 

 distal blind sacs or pouches. These pouches may be very distinct and 



