6o 



THE CRUSTACEA 



and in the male of that genus 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 CythereUa and some other genera the inner surface 

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



FIG. 35. 



A ..mandible of Pdycope frequens. B, mandible of Conchoecia magna. C, mandible of Sar- 

 sldlnlevis, 9- D, maxillula of Philomedfs interpwncta. E, maxillula of Polycopsis serrata. F, 

 maxillula of Maarocypris suednea. (After G. W. Miiller.) ex, exopodite. 



of long setae. The exopodite is represented in most Myodocopa 

 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- 

 doxostoma 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. 



