CKU8TACEA. 243 



front and the absence of the woolly patch on the outer surface of the 

 wrist. 



Litocheira bispinosa, Einahan, from Port Phillip*, which in maDy 

 of its characters seems to be allied to PseudorTiomMla sulcatifrons, is 

 at once distinguished by having but a single spine behind the exterior 

 orbital angle. [Specimens are in the British-Museum collection from 

 Port Curtis (II. M.S. 'Herald'). Mr, Haswell, in his Catalogue, 

 omits reference to this species, and to several others described by 

 Kinahan. 



The species described by Haswell as Euerate affinis (Catalogue, 

 p. 86) is, I think, identical with typical P. sulcatifrons (Stimpson). 

 The type was from Holborn Island, near Port Denison (20 fms.). 



I have quite recently described, under the name P. sulcatifrons, 

 var. atlanticat, a specimen from Goree Island, Senegambia, which 

 is scarcely distinguishable from Oriental examples of this species. 



87. Ceratoplax arcuata. (Plate XXV. fig. B.) 



Carapace longitudinally convex, scarcely broader than long and 

 not wider behind than in the middle ; the surface, when viewed 

 under a lens of sufneunt power, is seen to be covered with a very 

 short pubescence ; the sides are anteriorly arcuated, posteriorly 

 parallel : the antero-lateral margins, which are acute, are divided by 

 three slight notches, but can scarcely be described as dentated. The 

 front forms with the antero-lateral margins a continuous curved 

 line ; it is somewhat deflexed, obscurely sinuated in the middle, with 

 the exterior angles rounded off and not prominent, and has some 

 longer hairs on its upper surface. The first two segments of the 

 postabdomen in the male are very much shorter than the following, 

 almost transversely linear in shape ; the first segment, although 

 laterally produced, does not reach to the bases of the fifth ambulatory 

 legs. The eye-peduncles fit closely into the orbits (which are not 

 deep) and have their antei'ior and upper margins acute and clothed 

 with rather long hairs ; the small cornea? are lateral, and are visible 

 only in an inferior view. The epistoma is transversely linear ; the 

 antennules transversely plicated ; the basal (or real second) antennal 

 joint is slender, and does not nearly reach to the inferior margin of 

 the front (see fig. h) ; the flagellum is of moderate length. There 

 are no distinct palatal ridges. The outer maxillipedes are broad in 

 proportion to their length ; the ischium-joint little broader than 

 long : the merus transverse, its extero-dorsal angle prominent. The 

 chelipedes are moderately large, the right a little the larger, and the 

 margins of the joints are for the most part clothed with rather long 

 hairs ; the carpus or wrist is angulated on its inner surface, with 

 some long hairs at the angle ; the palm is little longer than broad, 

 and vertically deepest at the place of articulation with the mobile 

 finger, its margins are not cristated, its outer surface smooth and 



* Journ. Eoy. Dublin Soc. i. p. 121, pi. iii. fig. 1 (1858). 

 t Vide Aim." & Mag. Sat. Hist. ser. 5, viii. p. 259 (1881). 



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