6o 



THE CRUSTACEA 



and in the male of that genns it is apparently a clasping organ. 

 In the Halocypridae (Fig. 35, B) and Polycopidae (Fig. 35, A) 

 the first segment of the palp sends inwards a process tipped 

 with spines, which lies alongside the gnathobase and assists in 

 mastication. In Ciithevella and some other genei'a the inner snrface 

 of the first and second segments of the palp bears a comb-like series 



Fio. 35. 



A mandible of Polycope. frcqncns. B, mandible of Conchoecia magna. C, mandible of Sar- 

 siclla tevis, 9. T), ma.xilli\\a, of Philomedrs interpuyicta. E, ma.x\\lu\a, oi Poly eopsis serrata. F, 

 ma.\i\ln]a of Macroci/piHs sticcinca. (After G. W. Miiller.) cr, exopodite. 



of long setae. The exojjodiie is rej^resented in most JMyodocopa 

 by a small unsegmented appendage. In the Cyprididae and allied 

 families it is a flattened plate with radiating fan-like setae or 

 setiform processes, the so-called branchial appendage. In Para- 

 (loxodomii and some allied genera the mouth-parts are modified for 

 piercing and sucking. The mandible is styliform, with a slender 

 palp, and is enclosed in a conical beak formed by the labrum and 

 hypostoma. 



