72 CAUL BOVALLIIIS, AMPll 1 l'(il)A II VPKKHDICA. ViHlLlDAi. 



'Vhv Jirst pair of pereiopoda have tho carpus as lonf."- as tlie inetacai-pus; the posterior 

 mariiiii is straii>lit witlioiit bristl^s. The aiitei-ioi; coiivex inai'gii) oftlic motacarpus is smootii, 

 the postei"iov inargiri is straiglit, tinely serrated. The dactylus is shorter than half the 

 inetaca]'pus, findy sevrated at the posterioj- margin. 



The second pair (Pl. X, fig. 24) ha\e the carpus longer than the metacarpus; the 

 oarpal process short, indistinctly serrated, shorter than lialf the posterior mai'giii of the 

 metacarpus. The anterior and posterior margins of the metacarpus are convex, the ])oste- 

 rior rcigularly serrated. The dact\lus is shorter than a third of the metacarpus, not serrated. 



The tliird and fourth pairs (Pl. X, tig. 25) are vei"y robust, the tibia and carpus 

 are very broad, ahnost tumid, the posterior margins straight, beset ^vith very few minnte 

 spines. The metacarpus is shoi-ter than the carpus, tinely serrated along the posterior 

 margin. The dactylus is shorter than half the metacarpus. 



The fifth and ftixth pairs (Pl. X, fig. 26) are a thinl longei- tlian the fourth pair, 

 robust. The carpus is longer than the tibia, minutely serrated along the anterior margin. 

 The metacarpus is feebly bent, fringed along the anterior margins with minute spines. 

 The dactvlus is scarcely more than a fifth of the length of the metacarpus. 



The seventh pair ecjual two thirds of the fourth paii- in length; the fem ur is 

 longer than the three succeeding joints together. 



The pleon is as long as the last five pereifinnl segments; the lower margins of the 

 segments are feebly rounded. 



The pleopoda have the peduncles longer than the rami. 



The second and third )iral segments are only partlv coalesced, the distinction bet^\■een 

 both the segments being marked at the sides by deep incisions or notches. The coalesced 

 segment is as long as the preceding first ural segment. The hinder corners are jiroduced 

 back^wards into (jbtuse processes, not reaching as far as the hinder margin of the telson. 



The uropoda (Pl. X, tig. 27 — 30); the peduncle of the tirst pair is much longer 

 than the rami, broader belo^v, complicately serrated along the onter margin: the rami are 

 lanceolate, equal in length, showing peculiar apertures at the under-side and ^vell-developed 

 glands in the interiör'). The exteriör ramus is strongly serrated along the outer margin, 

 and coarselv along the inner. The interiör ramus is sharply serrated along both margins 

 with some few coarse teeth at the lower end. The jjeduncle of the second pair is much 

 longer than the rami, a little broader below, indistinctly serrated along the outer margin. 

 The rami are almost (>r|ual in length; the; ext(M"ior sharplv serrated along tlie iiuier margin 

 and coarseh' along the outer; the interiör ramus is sharply serrated along both margins, 

 The Jjeduncle of the third pair is pear-shape<l, very short, shorter than the rami and half 

 as long as the last, coalesced ural segment. The rami are eijual in length, tolerably 

 broad. The exteriör ramus is almost smooth along the onter margin and sharply serrated 

 along tlie inner margin with a \erv large a])erture at tlic lower end; the interiör ramus 

 is sharply serrated along both margins. 



The telson is broadlv rounded, almost broader than long and somewliat longer than 

 the peduncle of the last pair of uropoda. 



') This peL-iiliar organ will be spöken of iu tlie :inatomifal part of the treatise. 



