504 Mr. D. Sharp and Mr. F. Muir on the Comparative 



at base, the apex slightly curved. The basal-piece consists of two 

 small narrow sclerites, attached to the base of the lateral lobes, 

 but they do not meet on the dorsal side. 



NecropJiorns mortuorum (PI. L fig. 51). 



Median lobe chitinous on ventral and lateral aspects, membranous 

 on dorsal aspect ; median orifice large, on dorsal aspect of apex ; 

 median foramen small, on ventral aspect about one-fourth from 

 base. Lateral lobes broad at base, tapering to blunt point, bearing 

 several hairs. Basal-piece {hp) slender and ring-shaped. Internal 

 sac large, but details not examined. 



Astagohius aoigustatus. 



The median lobe large, slightly flattened and curved ; the median 

 orifice on the ventral face of apex, the dorsal edge being pointed ; 

 median foramen large, at base. Lateral lobes long and thin ; basal- 

 piece formed by a small curved sclerite on ventral face, but not 

 meeting on dorsal. Internal sac large, armature not observed. 



Bathyscia, sp. (PI. L figs. 52, 52r^). 



Median lobe tubular, slightly flattened towards apex on dorsal 

 face where it graduates to a point ; median orifice at apex on dorsal 

 face ; median foramen (m/) at base, as large as the diameter of 

 the median lobe, the edge being strengthened by a thickening of 

 the chitin (a). The tegmen consists of a broad ring-shaped basal- 

 piece {hp) with a pair of thin lateral lobes lying along each side of 

 the median lobe, the basal-piece being slightly posterior of the base 

 of the median lobe. Internal sac large, extending through the 

 median foramen. Arising from the apex of the sac is a short, stout 

 flagellum (c), along which the ejaculatory duct continues and opens 

 at its tip. The dorsal face of this flagellum is chitinous (a) and 

 broadened at the base where the corners articulate with a Y-shaped 

 ill) support (Jeannel's Y-piece) ; the ventral face of the flagellum is 

 membranous, except at the tip where the chitin forms a short fine 

 tube.* Fig. 52a represents the internal flagellum (c of fig, 52) on a 

 much higher scale of magnification. 



Liodes hmneralis (PI. L figs. 53, 53a, 536) is of the same type 

 as Bathyscia. The median lobe is chitinous, strongly bent at the 

 basal third, swollen at base and pointed at apex ; the median orifice 

 is at apex on ventral face ; the median foramen at base, and as large 

 as the enlarged base of median lobe. The tegmen consists of a 



* On this group reference may be made to an important memoir 

 by Jeannel, Arch. Zool. exp. v, 1910. 



