Biliish Species o/IIaliplus. 



1(1*1 



ill tlic tliffi-rent species, l)ut there is occasionally a small tutt 

 of a t\'W stitV hairs at or near the api!X. This loljo is pleiiti- 

 I'lilly supplioil with nuiscles, which run into it at rif;ht angles 

 to its haso. 



Tho other lobe varies {greatly in shape, bcinf; quadrilateral 

 in some species and triangular in others, but even in the 

 quadrilateral-shaped ones the base is always broader than 

 the ()|iposite side jind tho sh;tj)c is rather that of a triangle 

 of which one side has a slight bend in it. One of the b;isal 

 angles of this lobe is r!;reater than a right-angle, while the 

 other is acute, and at this latter the lobe is attached to the 

 base of the aideagus. The side of the lobe running up from 

 the angle of attachment is usually somewhat excised, and is 

 always, so far as I know, fringed for at least part of its length 

 with stifV hairs. At the extremity of the lobe there is usually 

 a tuft of stiff hairs, which Edwards described as a "long 

 eurvi'd .-pine " (5, p. 2). 



Fi-. 2. 



DiajTraiiiiiialic skuteli of <'iil(.'nj;:us, with tlie " loiif^uo "' {h) moved out of 

 ]M>sitioii, to show tliu deiirosi-iou (i) in which it lies, and also to 

 show tho opening: of tho auctus ejacnlatorins {/). rt = niain lobe; 

 <=tiie " hood " ; rf=tho saccular region, with its " winy" {d') ; e= 

 the thin wall of the ductus; (j—iho proove in the "tongue," with 

 tlie continuing groove on the main lobe (y). 



The a?dcagus itself (see (ig. 2) is a peculiar structure, its 

 chief peculiarity lying in the fact that it is asymmetrical. It is 

 a strongly curved chitinous organ into which passes the ductus 

 ejaculatoriiis, but this tube opens about halfway back along 

 the organ \\\)o\\ what is really its left side, the opening being 



