MOEPHOLOGY OF CYCLOPS. 



17 



setose. The slight differences in the chitinous appendages of tlie several limbs may be 

 seen in the following table; the order is from proximal to distal, and from within 

 outwards. 



Table of Differences in the Hairs l^c. home on the respective Oar-feet, in order from proximal to distal, 

 and from within ouhvards. P = plume; S = saw; T = tootli. 



Proper Muscles of the Frotopodite. Inner, middle, and outer extensors of basipodite. — 

 Three groups of muscles pass from short tendinous origins * on the anterior side of the 

 base of the coxopodite to the anterior face of the basipodite — an inner group of three 

 bands, a middle group of three, and a single slip of a single band to the outer angle of 

 the basipodite; all these three are extensors, the first, and possibly the second, also 

 adductors, while the third must abduct, and probably restores to place at end of fore stroke. 

 Internal to the inner group of extensors is the fourth extensor, a very fine slip (showing 

 exquisite striation in osmic-acid specimens), originating from the apodeme of the posterior 

 face of the limb, and inserted in the inner angle of the ba.sipoditc. 



The flexors of the basipodite. — Two strong muscles, come obliquely across from the 

 posterior edge towards the inner angle of the coxopodite, to be inserted a little outside 

 the middle of the base of basipodite on its outer side. These are flexor abductors of the 

 basipodite, and a third, rather fan-shaped, comes straight down from the junction of the outer 

 and middle thirds of the base of the coxopodite to the posterior face of the basipodite. 



Adductor of the exopodite. — A double slip from the middle of the inner edge of the 

 basipodite, joined by a third from the middle of its posterior face ; inserted in the inner 

 angle of the base of the exopodite. 



Abductor of the exopodite. — A strong muscle from proximal angle of inner edge of 

 basipodite running across the joint to be inserted into the outer angle of the exopodite. 



Proper Iluscles of Endopodite. — A double slip rises at the base of basipodite and runs 

 on its anterior face, anterior to the muscles just mentioned, straight to the base of the 

 2nd and 3rd joints of the endopodite, having an insertion in the inner angle of 

 each ; this probably adducts these joints and, I believe, flexes them too, 



A single slip from the base of basipodite, between two of the middle flexor muscles, I'uns 



* Distinct by their paleness in well-stained balsam specimens. 

 SECOND SERIES. — ZOOLOGY, VOL. V. 3 



