studies on inaiiiie OstriKods bU9 



having its armature somewhat more powerful (this armature is, however, subject to variation 

 even within the species). The next outer one is a tube-bristle of about the same type, size and 

 strength as the tube-bristles on the posterior process of this endite. The three remaining ones 

 are comparatively powerful, of moderate and in most cases somewhat different lengths, rather 

 well pointed, almost bare or armed with rather few secondary spines. My fig. 24 of C. 

 symmetrica agrees rather well with the normal type described above. The basale is in most 

 cases furnished with a single short-haired or almost bare tube-bristle of about the same 

 length as or somewhat longer or shorter than the first endopodite joint. This bristle 

 has in most cases no long hair distally (cf. below); in exceptional cases it may have long 

 secondary bristles at the middle; sometimes it may be ijuite absent. Endopodite: 

 First joint: Along the anterior edge this joint usually has six (in exceptional cases only 

 four) long bristles, the longest ones of which are in most cases somewhat longer than 

 the anterior side of this joint, the shortest ones about half as long as the former ones. All these 

 bristles are well pointed except one of those situated most distally, which is most frequently 

 of the tube-bristle type; the latter bristle is in most cases furnished distally with a rather long 

 hair; cf. my fig. 26 of C. symmetrica. In most cases these bristles have short hairs, only in ex- 

 ceptional cases they have rather long secondary bristles at the middle. At or somewhat distally 

 of the middle of the posterior edge of this joint there are almost always three (in exceptional 

 cases two or four) rather long bristles of somewhat different lengths, about as long as or somewhat 

 longer or shorter than this joint. In most cases these bristles have short hairs and are of the tube- 

 bristle type; one or two of them have most frequently a rather long hair distally. The bristle 

 on the inside of this joint, situated somewhat distally of the middle or rather near the distal 

 boundary of this joint, is in most cases about as long as the width of this joint or somewhat 

 shorter; it has short hairs, has long secondary bristles only exceptionally and is of the tube-bristle 

 type; this bristle always seems to be without a long end hair. Near the distal boundary of this 

 joint there is a somewhat varying number of — in most cases — rather weak spines along the 

 anterior half of the inside. The end joint varies in length and is always armed with five dist-al 

 bristles. The most anterior and the most posterior of these bristles are most frequently rather 

 strong, slightly bent, pointed, bare or more or less finely pectinated claws (the points of these 

 bristles are of about the type reproduced by me in fig. 28 of C. symmetrica). The three remaining 

 bristles on this joint are in most cases of the tube-bristle type, with short, fine hairs or almost 

 bare and with no long end hair. Of these bristles the most anterior claw-shaped one is usually 

 the longest, about as long as or somewhat longer than the breadth of the first endopodite joint 

 (counting from front to back). The most posterior claw-like one is somewhat shorter than the 

 former one, in most cases being at least somewhat more than half its length. The three remaining 

 ones are either subequal or somewhat different in length; the longest of them is usually somewhat 

 shorter than the most anterior claw-shaped one, the shortest one is usually about half tliis length. 

 The length of these bristles varies somewhat even within the species. Pilosity: Both the endite 

 on the procoxale and that on the coxale are furnished with a moderate number of moderately 

 long, stiff hairs both on the anterior and the posterior side. Apart from these this limb seems 

 in most cases to be quite bare. 



Zooloi;. bldrag, Uppsala. Sup|il. DJ. I " 



