398 University of California Publications in Zoology. [VOL. 6 



right and left; the posterior median mass is very thin. The 

 lateral masses extend dorsally and ventrally well into the main 

 longitudinal muscle mass, and in general the dorsal mass is 

 greater than the ventral. The efferent oviducts' and yolk-ducts 

 pass through this mass of gland cells, but no shell-material is 

 seen except in the first coils of the uterus. The cells of the gland 

 are large, swollen at the base, with slender "necks," leading into 

 intracellular ducts (pi. 44, fig. 68). These ducts appear to open 

 independently in the anterior wall. The cytoplasm of the gland 

 cells is dense, granular, and stains very intensely. The cell wall 

 is sharply defined. The nucleus is large, cloudy, with deeply 

 staining border and faint nucleolus. The nucleus lies in the 

 dilated base of the cell. The ducts have a sharply defined lumen, 

 and are of considerable size. 



The receptaculum seminis, originally described by Wagener 

 (1852) as the testis, is a large chamber, convex posteriorly, 

 slightly concave dorso-anteriorly, filled with a dense mass of 

 semen (rec. sem., pi. 39, fig. 42). It might be regarded as the 

 dilated blind end of the vagina, which enters its dorsal surface 

 near the anterior border. The receptaculum seminis measures 

 about 1.5 mm. by 1 mm. by 1 mm. It is surrounded, as above 

 noted, by the first coils of the uterus and their accompanying 

 shell-glands; on its dorsal surface lie the yolk reservoirs, the 

 receptaculum ovorum, and their efferent and afferent ducts. 

 From the dorsal surface of the receptaculum is given off a short, 

 thick-walled duct, the ductus seminalis, to the efferent oviduct. 



The wall of the receptaculum seminis (pi. 42, fig. 59) is com- 

 posed of a mass of finely felted fibres, elongated cells with large 

 nuclei and granular, non-fibrillated cytoplasm. Outside this 

 layer are found scattered cells of the shell-glands. This differs 

 markedly from Lonnberg's description (1891, p. 41) of the his- 

 tology of the wall of the receptaculum. "Das Receptaculum ist 

 von einen diinnen Pflasterepithel ausgekleidet, aber es besitzt eine 

 dicke fibrose Wand, die reich an eingeschalteten Kernen ist." 

 The writer cannot distinguish cell walls in the lining of the 

 receptaculum, but finds scattered nuclei, embedded in a mass of 

 delicate interlacing fibres. 



The receptaculum seminis' contains, embedded in the mass of 



