Mr. H. J. Carter on Microscopic Filaridee. 35 



sparsely scattered in groups (in cells?) over the remaining 

 portion. 



Posterior part of the intestine, which is sparsely covered with 

 hepatic glohules, presenting an irregular rhythmical influx and 

 expulsion of water through the rectum, like that observed in 

 some Naidina, where it is produced by cilia for the influx, and 

 by contraction of the intestine for expulsion. 



Organs of Generation (fig. 8). Double, cylindrical, sym- 

 metrical, occupying the middle half of the body, each half con- 

 sisting of an ovary and ovisac inflected upon the other part, 

 which is the oviduct or fallopian tube. Ovary and ovisac con- 

 tinuous, formed of a delicate, membranous, pyramidal tube, 

 blind at each extremity, and lying longitudinally in the perito- 

 neal cavity, with the pointed or ovarian extremity towards the 

 vulva, and the larger portion or ovisac in the opposite direction. 

 Fallopian tube thick, muscular, arising from the ovisac at a little 

 distance from the large extremity of the latter, which is thus ren- 

 dered csecal (figs. 8 c and 13 flf), and presenting one or more con- 

 strictions and dilatations in its course towards the vulva, where 

 it becomes suddenly narrowed and, uniting with its fellow of the 

 opposite side, forms the vagina. Ovary and ovisac filled with 

 ova in successive stages of development, up to the junction of 

 the fallopian tube, beyond which they do not extend, the csecal 

 extremity being filled with a muco-granular matter only. Dila- 

 tations of the fallopian tube filled with spermatozoa (each of 

 which is enclosed in its respective cell), and a greater or less 

 number of ova, extending in single file up to the vagina. 



Largest size l-6th of an inch long and l-370th of an inch 

 broad. 



Male (fig. 9). The same as the female, but smaller, and with 

 the tail truncated almost close to the anus. 



Organs of Generation (fig. 10). Double, occupying the middle 

 half of the body, consisting of two cylindrical, delicate, mem- 

 branous sacs of a pyramidal form, lying longitudinally in the 

 peritoneal cavity, with their large ends approximated, each large 

 end giving off a short narrow tube, which, becoming united, 

 form a large seminal duct that is continued straight back to the 

 neighbourhood of the rectum, where it terminates in a dilated 

 portion, in the parietes of which are fixed two ensiform or sca- 

 phoid bodies of a horny consistence and yellowish colour, which 

 together form the penis. These lie obliquely across the body, 

 are thin, and curved longitudinally as well as transversely in- 

 wards, so that, when approximated at their pointed ends, they 

 form a canaliculated, stifi", pointed, pyramidal, curved organ, 

 which is exsertile at the anus. 



Development of the Ovum (fig. 13). The ova first appear as a 



3* 



