138 l?E('<tK|>S OF THK AT'STHAI.IAX MTSKCM. 



less cui'ved and ohlicjiie ; lower down tliey iire straighter 

 and enci'oaeli gradually more on the inetazonite. Pores start 

 witli the sixth somite ; they open in the prozonite, and they are 

 surrounded upwai'ds and hackwaids by a special, angularly 

 curved sulcus, the perpendiculai' postej'ior bi-anch ot" whicdi is 

 the oidy trace of transverse sutui'e to he witnessed. 



Last segment with posteiior margin aiigulai'ly produced ; 

 the process does not cover the uppei' angles ot" the anal valves. 

 ']'he latter ai'e largely prominent, rather flattened ; they are 

 compressed near the mai'gins, which, however, remain rounded 

 and show no tiace of mai'ginal sulcus. Anal sterniie triangu- 

 lar. Sternites of the othej' segments transversely striate. 

 Stigmata small. 



Legs very sluu't. with l)ut one or two distal hristlcs on the 

 venti'al surface of each joint, except the last. 



Male: 'rar>i padded (PI. xvii., tig. ')>^): the pads grow 

 laj'ger up to the seventh pair of legs, then become giadually 

 smaller backwards ; they disappear after the thirty-sixTli 

 zonite. On the five anterior- pairs of legs, the ventral surface 

 of joints, three to five, is warted, the warts being larger on the 

 fii'st two pairs tlian on the following. The second pint of the 

 second pair is hollowed inwai'dly. The penis is a small 

 membranaceous cone, not even as long as the coxa? of the 

 |)i'eceding legs. Coxa* of the third (tig. 58) and fourth pair 

 produced, the pi'ocess growing smaller on the followiii<i: ])aii'. 



Copulatory appendages: — Anterior giniopods (V\. xviii., tigs 

 61, 62) : — basal ])iece of the venti-al plate (W) twice as wide as 

 high, rounded latei-ally ; its anterior margin is strongly sinuate 

 and, from the middle, stai'ts an ehuigate pi-ocess. in sha])e of a 

 spear-head, about equal in length to the basal part. Tracheal 

 stalk (ti^.) long and slender. The coxae are not in contact on 

 the middle line ; they ai-e simply connected together through 

 the rounded posterior basal plate (r.'2.) ; their distal expansion 

 is ti'iangulai', narrow, ami reaches at least the summit of the 

 ventral plate : proximally they end in an oblique endoskeletic 

 process (('■</,■.) half as long as the tracheal stalk. Kemur fused 

 with the coxa. Tibia in a line with the femur, i-ather short 

 slightly tapering distally. tipped with an isosceles triangulai- 

 piece equal to four-tiftlis ot the iil)ia. reaching somewluit be- 

 yond the coxal expansion. 



