THE CUM ACE A 



185 



When the lateral plates are removed, the conformation of the head 

 and the position of the eye show some similarity to the arrange- 

 ment met with in the Oedicerotidae ex 

 among the Amphipoda. The two eyes 

 are distinct in the embryo, and in one 

 genus (Xciiinaxtacus) also in the adult. 



.-l]>/>en>tages. The antennules rarely 

 have both flagella well developed, the 

 inner being usually reduced or absent. 

 The antennae differ remarkably in the 

 two sexes. In the female (Fig. 112, a") 

 they are vestigial, while in the male they 

 consist of a stout peduncle of five seg- 

 ments, of which the last two are enlarged 

 and clothed with a brush of long setae, 

 while the flagellum is filiform and may 

 exceed the length of the body (Fig. 113). 

 In life this long flagellum is usually 

 carried folded close to the side of the 

 body, protected by the lower edge of the 

 carapace and by the pleural plates of the 

 abdomen, or in a special groove which 

 runs along the sides of the abdominal 

 somites. In the genus Lamprops the 

 antennal flagella of the male are short 



anrl <?trmt ami -irp ii<5prl i<5 rlasnin o- nro-<in<s "pea enclosed in branchial cavity 

 ,OUt, and die USeCl as CldSping-OrganS at side of car apace; e, eyes, coal- 



to hold the female. t ' sn> ' 1 into . one; c ?' ex P od , ite OI 



first maxilliped, forming the re- 



Ihe mandibles never carry a palp, but spiratory siphon; fr, lateral 



,i r .1 branch of "frontal fissure" be- 



m Other respects COniOrm to the type tweeu the head and the lateral 



r>Jvivnptpririp r>f tViP Ppr-inarirla Tti tVio plate of pseudorostrum ; h, heart ; 



1 tne hep, hepatic caeca; 1 1, first pair 



Leuconidae and in the genus Diastiiloides f le s s ; ov, ovary ; ps, pseudo- 



,, , , ,, j-ii T i rostrum. (After Sara.) 



the body or the mandible is short and 



triangular and the row of spines is reduced. In Campylaspis the 



molar process is styliform. 



Fio. 112. 



Diagram of anterior part of 

 body of Diastylis, <} , from above, 

 showing the internal organs, a', 

 anteunule ; a", antenna ; br, 

 branchial epipodite of first maxil- 

 liped enclosed in branchial cavity 



Pio. 113. 



1'tci-' .'!, (J, from the Caspian Sea. (After Sars, from Ency. Brit.) 



The niaxillulae (Fig. 114, A), except in Platyaspis and Para- 

 lamprops, carry a retro verted palp as in Tanaidacea and Lopho- 

 gastridae. The maxillae (Fig. 114, B) with their two terminal 



