28 ABERRANTIA. 



Group ABEEBANTIA. 



THIS group is distinguished from the more typical 

 Amphipoda by the abnormal condition or the absence of 

 one or more segments of the pleon, as well as by the 

 coxae not being largely developed into scales, and being 

 mostly fused with their respective segments of the 

 pereion. 



This group comprises the genus Dulichia together with 

 the L^MODIPDA, an order founded by Latreille to sepa- 

 rate the genus Caprella from the ISOPODA, amongst which 

 naturalists had previously arranged it. 



It corresponds with the order L^MODIPODA of Milne 

 Edwards, including the family Dulichiida of Dana. 



Fam. I. DULICHIID.E. 



PEREION six-jointed ; the last two segments fused into 

 one. The last segment of the pleon absent. Telson squa- 

 miform. Fifth pair of pereiopoda attached to the pos- 

 tero-inferior angle of the sixth segment. Posterior pair 

 of pleopoda wanting. 



In the typical forms of Aberrant Amphipoda, all the 

 legs have the coxae fused with the respective segments of 

 the body, and the tail is reduced to a rudimentary condi- 

 tion. In CERCOPS the tail, though rudimentary in 

 appearance, has, according to Kroyer's figure, but one 

 segment wanting. The absence of the natatory appen- 

 dages, as well as of the first two pairs of walking legs, 

 approximates this genus to Caprella. It is clear, there- 



