578 TAiiK SKtKisiii:i;i; 



which aiv attiu-hoil t'h).st' to eai-h othor Itoth proxiiiially and ilistally; i)nc' part is situated soinowhat 

 ili>rsally nf tlio otluT (M1 the iiu-dial side of the liinh; this imiseh' is attached proxiiiially somewhat 

 in front of the ventral half of the proximal hoinidary of the first joint, distally on the proximal 

 boundary of the second joint, at about half the height of this joint. (This nmscle seems to move 

 the second joint straight inward.) In passing I wish to iiiciition that the distal attachments 

 of two muscles are to be found proximaliy on the fust joint. — The second joint has the following 

 four muscles: The flexor of the fourth joint, a very powerful muscle, and, as far as 1 could ascer- 

 tain, purely of a flexor nature; it is in most cases divided into two parts; the more powerful 

 part, the ventral one. is ])roximally attached ventero-proximally on the second joint, the weaker 

 part has its proximal attachiucut proximo-ini'di^illy on this joint al)out half way up it. Dorsally 

 in this joint there is a very powerful muscle with its proximal attachment dorso-proximally on 

 the joint and attached distally on the proximo-medial boundary of and at about or somewhat 

 above lialf the height of the fourth joint. A smaller part of this muscle is often proximaliy 

 attached about half way along the second joint, dorsally. (This muscle seems to move the 

 fourth joint inward and somewhat dorsally.) A rather short and moderately strong muscle 

 runs on the medial side of the second joint, with its distal attachment dorso-proximally on the 

 fourth joint and its proximal attachment a rather short distance proximaliy of the distal boun- 

 dary of the second joint, at or somewhat ventrally of half the height of this joint. Finally we 

 find on this joint the flexor of the fifth joint, a moderately strong muscle, presumably of a purely 

 flexor nature, perhaps moving the fifth joint a little inward too; its proximal attachment is 

 proximo-medially on the second joint, at about half the height of this joint, its distal attachment 

 ventrally (perhaps somewhat medially) on the proximal boundary of the fifth joint. — There 

 is no special muscle in the third joint. — In the fourth joint there is a single muscle; it is very 

 short, but rather powerful; its proximal attachment is about at or somewhat proximaliy of the 

 middle of the dorsal side of this joint, its distal attachment on the proximal boundary of the 

 fifth joint, ventrally and somewhat laterally of the former flexor of this joint. — We find the 

 same muscles in this antenna of the females of this genus, but the flexor of the fourth joint is 

 divided in the second joint into two parts, one of which is proximaliy attached ventrally on the 

 second joint at about or somewhat proximaliy of half the length of this joint. The muscle of 

 the fourth joint that has its proximal attachment proximo-dorsally on the second joint is 

 simple. (All the muscles are weaker than those of the male.) 



In the genus Halocypris we find all these muscles in the first antenna, with only small 

 divergencies. It is to be noted, however, that the muscle of the fourth joint that is characterized 

 in Conchoecia by being very short, with its proximal attachment a rather short distance proximaliy 

 of the distal boundary of the second joint, runs near the lateral side of the limb in the 

 genus Halocypris. For other details the reader may compare fig. 7 of Conchoecia symmetrica 

 with fig. 8 of Halocypris breeirostris. 



The state of affairs in the first antenna of the genus Euconchoecia is considerably more 

 complicated. In this genus too the highest number of joints found in this limb is five; of. this 

 genus below. Yet it seems impossible — at least at present — to say that these joints are 

 homologous with the five joints on this antenna in the genera Halocypris and Conchoecia. In 



