5-28 



PROCEEDINGS OE THE NATIONAL MUSEUM. 



VOL. XXVIII. 



testes, a long vas deferens leading- from each, and a pair of spermato- 

 phore receptacles in the genital segment. The testes (t.) are ovate or 

 conical bodies situated in positions corresponding exactty to those of 

 the ovaries. 



They are considerabty smaller than the ovaries and each gives off 

 from its anterior end a duct, the vas deferens (v. d.), which leads 

 directly backward without any convolutions into the genital segment. 

 Here it enters the outer border of the spermatophore receptacle (s. r.) 



at or posterior to its center. Each 

 receptacle is oval or elliptical in 

 shape, situated about in the cen- 

 ter of its own half of the genital 

 segment, and opens to the exter- 

 ior near the posterior angle of 

 the segment. On the ventral 

 surface of the receptacle, or a 

 little to one side of it, is a small 

 cement gland (c. g.) which se- 

 cretes the viscid substance com- 

 posing the covering of the sper- 

 matophore. 



In the receptacles the sperms 

 are gathered into oval spermato- 

 phores, each of which is covered 

 by the viscid secretion from the 

 cement gland, in which condition 

 they are pushed out of the re- 

 ceptacle and into the vagina of 

 the female. As A. Scott re- 

 marks, the spermatophores do 

 not always reach the vagina, and 

 being viscid they stick to the 

 female's bod}^ wherever the}^ may 

 touch it. We thus often find 

 them scattered in little bunches 

 or clusters in various places all 

 over the ventral surface in among 

 the appendages. This was probably what the earlier observers mis- 

 took for eggs, after they had decided that the true egg sacks were 

 antennae. 



SUMMARY. 



1. The body wall is made up of three layers, the outside cuticle, 

 the median cellular tissue, and the inner connective tissue which 

 forms a lamina supporting the various organs. 



2. The alimentary canal is practically a straight tube running from 

 the mouth to the anus, with the regions but slightly differentiated in 



Fig. 34. — Sexual organs of a male Lepeophthei- 

 rus edwaedsi. c. g., cement gland; o, opening 

 of the spermatophore receptacle, s. i\, to the 

 exterior; t, testis; v. d., vas deferens. 



