17G 



TAOK SKOOSnRHC. 



an/. 



throo bristles. < M i lu' two joints ol the c ii d o |) o d i I c the proximal otio is largo and powerful; 

 tho distal one is directed somewhat inwards, small. 1ml latliei iiowerfiil, armed with 

 numerovis powerful bristles (with the exeeptioii of the males of the sub-family Philomedinae). 

 With regard to the differences between the previous authors' interpretations of tlH> 

 difTerent parts of this limit and that which is followed in this work, see above p. 31. 



1' i f t h limb: - Cf. fig. I\', p. 39. With or without sexual dimorphism. — It 

 is short, foliaceous and developed as a powerful masticatory organ. Exceptions are the males 

 of the sub-family Philomedinae. in which this, like the. preceding limb, is fitted with very 

 weak masticatory parts and in which it can certainly not be used for mastication of food. The 

 p r o t o p o d i t e is powerful, dominates somewhat over the exopodite, is united rather much 

 with the bodv. is generally only rather weakly divided into two or three joints and is directed 



vertically. On the inner edge it is armed with three powerful, 

 although rather slightly projecting endites, one on the pro-coxale, 

 one on the coxale and one on the basale, all three of which are 

 armed with bristles. The marginal bristles of the epipodial 

 p 1 a t e most frequently diminish rather regularly in length 

 the more dorsaUy and ventrally they are fixed. The e x o- 

 p o d i t e is four- or five-jointed, directed obliquely backwards 

 and outwards. Its two proximal joints are powerful and serve 

 as masticatory organs, most frequently rather well defined 

 both from each other, from the protopodite and from the third 

 exopodite joint; on the inner edge both are furnished with a 

 greater or less number of more or less powerful bristles, the proximal one has in addition a 

 more or less powerful tooth, consisting of several constituent teeth placed in a row. The 

 following exopodite joints generally differ very greatly in their structure from the two 

 preceding ones, they are very slightly chitinized and take no part in the mastication of the food. 

 The fourth joint is deeply sunk in joint no. 3, so that the latter is divided into an outer and 

 an inner lobe, the connection of which is often to be seen only in rather young specimens; the 

 inner lobe is .sometimes more or less reduced. The endopodite not developed. 



With regard to the differences between the interpretation of the different parts of this 

 limb that have already appeared in the literature and the interpretation accepted in the present 

 work see above p. 37. 



Sixth limb: — Cf. fig. VII, p. 48. Without or with rather weak sexual dimor- 

 phism. — It is always rather large yet rather moderately lengthened in the longitudinal 

 direction of the body, directed ventrally. It consists of a rather well developed, more or less 

 obviously two- or three-jointed protopodite and a rather powerful exopodite; the 

 endopodite seems always to be lacking. Protopodite: Armed on the anterior 

 edge with three endites, of which at least the two distal ones are well developed; one of these 

 is placed on the basale, the two others on the procoxale-coxale. The endites are furnished with 

 a varying number of bristles, most frequently rather powerful, some of which are placed 

 distally, some medially, generally .somewhat more proximallv (measuring from the top of the 



Fig. XXIV. — Horizontal section of 

 the maxilla nf a form bplonging to 

 thpsnb-gpnns rori;i//o,(iiagrnininatir. 



