14 



in my opinion with Filhol's species. As this is incompletely known, a fresh description and 

 some figures may not be superfluous. 



The carapace, as in all Hymenosomidae, is flattened and flexible above; the length, 

 including the rostrum, equals the breadth. The rostrum itself is horizontal, broadly-triangular, 

 but the anterior part is truncate, and in the middle of the anterior margin an obtuse prominence 

 marks the tip of the rostrum; the borders of the latter are hairy, and posteriorly the rostrum 

 is defined by a slightly raised rim, straight in the middle, but curved backward at either end, 

 near the upper orbital margin (fig. 3 a). The anterolateral borders of the carapace are somewhat 

 convex, and a very low prominence immediately below the bordering rim of the carapace 

 represents the antero-lateral tooth; the posterior tooth is very acute, pointing forward, and 

 placed below the border, midway between the external orbital margin and the posterior edge 

 of the carapace. Behind the posterior teeth the margins of the carapace are a short way sub- 

 parallel, then converging, and becoming even concave above the implantation of the last pair 

 of legs, towards the posterior angle ; the hind margin of the carapace is straight ; Ya of the 

 total breadth of the latter. The cervical groove and the two short ones, radiating from either 

 end, are distinct, but otherwise there is no indication of regions; the gastric and cardiac region 

 are somewhat bulging, the hepatical and branchial areas concave ; on the mesogastric regions 

 there are two longitudinally-oval, tympana-like structures, each followed behind by a very small 

 spot of the same kind, and with a faint longitudinal line between. The sloping parts of the 

 carapace are nearly perpendicular, and everywhere, especially posteriorly and above the base 

 of the legs, numerous club-shaped hairs are implanted, which on microscopical examination are 

 feathered all round, save the short stalk. 



The antennulae are much stouter and longer than the weak antennae; the basal joints 

 of the former are short, though projecting beyond the rostrum ; a very slight rim at the under 

 surface of the rostrum separates them; the next joint is about twice as long, but only halt as 

 thick; the third joint again is as wide at the base as the preceding joint, but widening distally, 

 and of the length of the basal joint. The antennae are implanted in the outer half of the 

 infra-orbital border; the basal joint is directed obliquely-forward and inward, the two following 

 joints being of the same length, directed straight forward, and gradually diminishing in thickness; 

 the flagellum is very short and reaches at most as far as the second peduncle-joint of the 

 antennules. The eye-stalks are short and thick ; seen from above they are wholly exposed 

 (fig. T,a)\ they are placed in shallow sockets, the borders of which are entire; the external 

 orbital angle is a mere rim, sharp, but slightly raised. 



The epistome is short, about three times as broad as long, the breadth being equal to 

 the distance between the external orbital angles. The Ijuccal cavity is nearly quadrate, its side 

 margins only slightly diverging backward; from the anterior angle a sharp rim runs backward 

 on the pterygostomial region, disappearing at the base of the anterior walking legs, and most 

 projecting in the middle of its course. 



The external maxillipeds are gaping; measured along the outer margin the merus is 

 longer than the ischium and constricted at the base ; the inner margin of both joints is fringed 

 with long hairs; the ischium has a broad inner lobe, as is usual in the family, and is about as 



14 



