]«<; TAdio sK()(;si:i:i;(; 



armed with powerful lateral teeth, ol' wliieli the distal ones, beginning tirst a little way from 

 the point of the bristle, are usually the most powerful; they are never furnished with long, 

 stiff side-bristles and in most cases, contrary to all the other bristles of this joint — and most 

 of the bristles on tliis limb — they are not annulated. — G. W. MtiLLEli makes these bristles 

 form a ,, tooth" together, comparable to the ,,main tooth" of the preceding joint; see 

 G. W. MtiLLER, 1912, p. 9, fig. 7. I have not considered that I ought to follow this method 

 of procedure — although it is comprehensible — because these bristles do not together form 

 quite so pronounced a morphological unit as do the bristles through the union of which the 

 „main tooth" must be regarded as having arisen. They are, on the contrary, quite free basally, 

 at least in all the species of this sub-family that I myself have had occasion to investigate. — 

 Somewhat outside and in front of these bristles there is a somewhat irregularly arranged collection 

 of, for the most part, rather long and powerfid, strongly pectinated bristles; in these, too, the 

 anterior ones are rather considerably longer than the posterior ones; in addition the inner ones 

 of them are most frequently somewhat longer than the outer ones; their pectination, which 

 continues right to the point of the bristles, is somewhat weaker distally than in the 

 middle; like the bristles in the last-mentioned group these bristles, too, are without 

 long secondary bristles (one exception: Cypridina (Gypridina) serrata var. a f firmans). 

 Besides these bristles there are in all the species of this sub-family described in this treatise 

 two additional bristles on this joint, one close to the last-mentioned group of bristles on 

 the posterior side of the joint and one on the anterior side of the joint close to the follow- 

 ing joint. The two or three distal joints are fitted with a somewhat varying number of 

 generally rather weak bristles. 



Sixth limb: — Without or at any rate with only very weak sexual dimorphism. 

 — It varies rather much in type. 



Seventh limb: — This has no or only very weak sexual dimorphism. — The 

 number of the cleaning bristles varies very much: in some species there are only a few (8 — 10), 

 in others they are very numerous, as many as a few^ hundred being found. The teeth of the 

 end comb vary similarly very greatly in number; while in some species only a small number 

 (5—6) are to be found, they are in other forms very numerous (100 — 150); their usual number 

 is about 14 — 20. Within each species the variations in number of the cleaning bristles and the 

 teeth of the end comb are rather limited. In most forms the distal teeth of the end comb are 

 distinguished from the proximal ones by their type. The former are in most cases somewhat 

 longer and narrower than the latter and are rounded or even pointed distally; the latter, 

 which are situated proximally close to the former about symmetrically on each side of the 

 extremity, are distally cut off more or less sharply. In other respects the distal part of this 

 limb varies somewhat in type. 



The b r u s h - s h a p e d organ is very seldom found; among all tlie species of this 

 sub-family included hitherto in the literature only the female of Cypridina squamosa G. W. MtlLLER 

 has been established as possessing it; of. G. W. MUller, 1894, pi. 2, fig. \\\. 1 have not succeeded 

 in finding tliis organ in either the males or the females of any of the species of this sub-family 

 that are described in this treatise. 



