89 



declivous towards the bases of the second to fourth walking legs; the sloping portions are 

 defined superiorly by a sharp line, somewhat curved anteriorly and nearly continued til 

 margin of the carapace. There are two pairs of very indistinct transverse depressions, 

 the level of the cervical groove and one running inward at the level of the posterior lateral 

 teeth. The epigastric lobes are present, but very indistinct, and anteriorly to these the fro 

 is perfectly flat, laminar and horizontal, with a straight anterior margin : ), that passes with 

 obtuse angles into the lateral margins. The upper orbital margin is strongly S-shaped and 

 separated from the lateral margin of the front by a closed incision, beginning with a triangular 

 sinus. The distance between the external orbital angles is less than the length of the carapace; 

 the angles are prominent, but obtuse at tip, and their lateral margins are markedly diverging 

 backward; the epibranchial teeth are acute, with the lateral margins subparallel, and separated 

 by deep sinuses; the anterior pair of these teeth is larger and more depressed than the posterior 

 pair; distance between tips of posterior pair of teeth is equal to length of carapace. Postero- 

 lateral margins slightly converging backward 2 ) ; posterior margin nearly equal to anterior breadth 

 of front. The front projects a considerable way beyond the bases of the antennules, that are 

 quite concealed in dorsal view, and the bases of which are separated by a triangular "nasal 

 lobe". The epistome is narrow, ó 1 /.^ times as broad as long, excavated, and the posterior margin, 

 between the ridges of the endostome, is somewhat crenulate. The antennae fill the gap between 

 the front and the blunt inner orbital lobe. Pterygostomial regions granular and somewhat hairy ; 

 a granulated ridge runs obliquely backward from the anterior angles of the buccal cavern, disap- 

 pearing distallv. In the c? the breadth of the exognath of the external maxillipeds measures, 

 according to Miss Rathbun, i 3 /. times the width of the ischium ; in my specimen this exognath 

 is i 2 / 5 times as broad as the ischium and is much swollen, smooth and entirely glabrous, as 

 is usual in the cf of this genus, reaching nearly as far forward as the large auricle of the 

 merus; outer surface of both ischium ('the lateral margins of which are subparallel) and merus 

 likewise hairless. In the 9 tne exognath is flattened; it reaches as far forward as in the ef, 

 but it is much narrower, not attaining even the width of the rather broad ischium 3 ); the outer 

 surface of the whole maxilliped is covered with very short hairs (Figs. $ó and c). 



The abdomen of the cf is of the usual shape (Fig. 5 af), with the lateral margins slightly 

 convercnngr forward, the terminal seement beino- narrow, lonoer than broad at the base, and 

 the penultimate segment shorter and three-fourths of the width at the base. The eggs oi the 

 9 are very sniall and most numerous. 



The chelipeds of the (f are equal in size, very stout and bulky. The edges of the 

 meropodite are somewhat roughened by granules; upper and inner margins provided with some 

 hairs; there is, besides, a sniall patch of hairs on the inner surface; the upper margin has 110 

 subdistal projection. The wrist ist globular, with some very minute transverse granulated rows 

 on the upper surface; the inner surface is flattened, bordered above and belovv by a granulated 



1) Miss Rathbun states that it is feebly bilobed, but in all my specimens it is perfectly straight. 



2) Subparallel and sinuous according to Miss RATHBUN. 



3) Miss Rathbun states the same for the 2- but at the beginning of her diagnosis she says that only one specimen (■£ ) has 

 been caught. 



89 



SIBOGA-EXPED1TIE XXXIX c. 12 



