On the Morphology and Systematics of Diplopods. 515. 
anteriorly. The anterior margin of the eye-plate extends in 
front of the eye-capsules, very obtusely pointed in the centre ; 
posterior margin widely and very shallowly emarginate. 
Very characteristic is the small oval muscle-attachment, 
which is connected by a very narrow chitinous band with the 
Fig. 10. 
rim of the eye-capsules. The latter are notably wider in 
front than behind; sinuate on both the inner and outer 
margins ; lenses large and of the usual shape. 
The capitulum is broadly built, length of the maxillary 
plate about ‘58 millim. Seen from the front the lateral and 
distal margins are only moderately emarginate ; side-processes 
short, curved sharply inwards at their apices. The pharynx 
greatly resembles that of H. infundibulifera, var. stagnalis 
(see fig. 9a) in outline. Air-tubes shorter than the pharynx. 
The palps are about 1°75 millim. in length. Second seg- 
ment with 4 or 5 feathered spines on the distal margin and a 
group of four more on the extreme inner corner. ‘Third 
segment with about 20 long strongly feathered spines in the 
vicinity of the inner distal corner, which is moderately deve- 
loped. Fourth with many long bristle-like hairs grouped 
towards the inner margin, becoming more numerous at the 
distal end of the segment, many feathered. 
Locality. Found in Ballynahinch Lake, County Galway, 
by Mr. W. F. de V. Kane, June 1900. 
LI.—Remarks upon the Morphology and Systematics of 
certain Chilognathous Diplopods. By Kh. I. Pocock. 
I.—On tHe TERMINOLOGY AND EVoLUTIONOF THE GONOPODS 
AND OF THE PENIS. 
Tue modified appendages of the seventh segment in the 
males of the Helminthomorphous Diplopods are commonly 
spoken of as “pedes copulativi,’ “ gonopods,’ or, more 
