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tions (PL II. fig. 3, A). In some articulations, both 

 sexes exist ; in others, sometimes the male, and some- 

 times the female, separately. 



The male opening (PL II. fig. 3, B) exists about 

 the middle of the articulation ; the female (if both 

 sexes be present together) below it, and near the pos- 

 terior margin (PL II. fig. 3, C). The penis (PL II. 

 fig. 4, a), of equal thickness throughout, f" (Kiichen- 

 meister), is easily protruded about 3-'" beyond the mar- 

 gin of the opening. The prepuce is formed by this 

 margin of skin, which is undulatory in character, and 

 in which are scattered calcareous corpuscles, the 

 " glandulse preputii " of Eschricht. The penis com- 

 municates with a pretty long deferent canal, several 

 times wound upon itself, which gradually increases in 

 thickness, and terminates in a vesicula seminalis in 

 the form of an obovate pouch (Moquin-Tandon). 

 Dr. Kiichenmeister, in his work, " Die in, und an, dem 

 Korper des lebenden Menschen vorkommenden Para- 

 siten," Leipzig, 1855, does not speak of a vesicula 

 seminalis ; but, under the name of sac of the penis, 

 describes " a vesicle situated in a proper capsule, 

 f " in length, J in breadth, between the uppermost 

 thick horns of the uterus, and in which the penis is 

 suspended to a strong twisted stem, -J-'" in length," 

 which I presume to be the analogue of the vesicula 

 seminalis described by Moquin-Tandon. Leading 

 from this, and placed between the lateral uterine 

 horns upon its dorsal aspect, are several fine deli- 

 cate canals, from ^ to ^Y" i n thickness (Kiichenmeister), 

 which, according to Moquin-Tandon, go to the testis. 



