NO. 1105. PROCEEDINGS OF THE NATIONAL MUSEUM. 203 



with a double row of hooks 20 /* long, about GO hooks in each row. 

 Suckers comparatively large, 0.25 mm. in diameter, armed with numer- 

 ous hooks of various sizes, the prongs of the longest attaining 10 /4 in 

 length. These hooks are arranged in about 7 to 9 concentric rows con- 

 taining about 750 (estimated) hooks of various sizes. Neck short and 

 thin, 0.8 mm. 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 the middle to near the proximal por- 

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

 to 0.14 mm. long by 44 to 64 /< broad, muscular layer may attain 12 to 

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

 except the center portion in which the female glands are located. Eggs 

 are arranged in egg capsules, about 160 visible from one surface of the 

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

 measuring 20 to 24 /* in diameter in each capsule. 



Hosts. Eastern Jackass Hare (Lepus melanotis) by Tallichet and 

 Norgaard; cottontail (L. sylvaticus) by Curtice, Hassall, and Stiles; 

 intermediate host unknown*. Several specimens found in collection of 

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



Types. Description taken from four strobile with heads, and several 

 fragments. Bureau of Animal Industry Cestode series No. 1196 desig- 

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

 Paratypes distributed as follows : Collection of Bureau of Animal Indus- 

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

 Kensington Museum and Vienna Museum. Technique of type specimen 

 (poorly preserved), alcohol, hiematoxylin. 



Geographical distribution. United States of North America; Texas 

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

 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 hand are 

 not so complete and satisfactory as might be desired. 



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

 cephalinge (exclusive of Stilesia), we find at least three distinct types 

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



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

 extending across the median field- of the segment, as in Anoplocepliala. 

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

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

 the anlage is generally single, but in some cases (C. variaMlis} it may 

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



The 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 



