MONTAGUA MONOCULOIDES. 55 



is composed of many small jointlets,* each having several 

 cilia. The inferior pair are shorter than the superior, 

 and less robust. The mandibles are long and narrow, 

 and furnished with a serrated cutting margin. The 

 outer pair of foot-jaws have the third and sixth joints 

 respectively longer than the fourth and fifth conjoined : 

 the seventh terminating in a sharp point. The first 

 pair of legs are short and slender, having the first joint 

 not developed into a scale ; tlie hand is longer than the 

 wrist, and developed in the same form as that of the 

 second pair; the palm is very oblique, and defined from 

 the inferior margin by a very obtuse angle. 



The second pair of legs have the first joint large, 

 scale-like, narrow, increasing in breadth gradually from 

 the body, and reaching so far in front as to cover the 

 appendages of the mouth ; the wrist is short ; the hand 

 long, ovate ; the palm oblique, slightly convex, and de- 

 fined by an obtuse angle, armed with two short sharp 

 spines, against which the apex of the slightly-curved 

 finger impinges. The third pair of legs have the first 

 joint more largely developed than that of the preced- 

 ing pair of limbs, and with the inferior margin fringed 

 with minute equidistant cilia, situated within the edge ; 

 the foot is slightly bent, having the margins parallel, 

 and armed upon the inner distal extremity with two 

 short sharp spines, against which the finger impinges 

 near the base, thus giving the foot a prehensile capa- 

 bility. The fourth pair of legs are like the third, but 

 have the first joint still more largely developed, being not 

 only produced anteriorly, parallel with the preceding, but 

 extending as far back as the penultimate pair of legs. 



* The term jointlet, or articulus, is used to indicate its distinction fi-om 

 a joint : some authors have described the flagelhim as a single joint, and 

 others as if every articulus was a distinct joint. 



