CRUSTACEA. 211 



dactyl, where there are a few hairs), acute at their apices, and den- 

 ticulated on the inner margins only at base, the margins (in their 

 distal half) thin-edged and entire. Ambulatory legs of moderate 

 length and rather compressed ; the dactyli very short. Colour (in 

 spirit) purplish or fuscous brown. Length a little over 5 lines 

 (11 millim.), breadth nearly 8 lines (16£ millim.). 



Two specimens (males) were obtained on the beach at Port 

 Darwin (Xo. 176). 



The absence of any distinct lobation of the carapace or of distinct 

 antero-lateral marginal teeth is very characteristic of this species, 

 which is also distinguished by its quadrilobate front. (See fig. c.) 



I at first referred this species to the genus Actcea, not having 

 observed the notches in the front of the endostome*, which in one 

 specimen are nearly obliterated. Jn a specimen sent by Mr. 

 Haswell from Port Denison, which in its narrower carapace con- 

 nects this species with Atergatopsis, these notches are deep and well 

 defined. In two specimens in the Museum collection which I refer 

 to the typical Banareia armata, A. M.-Edwards (since they agree 

 with that species in all particulars except in the notches of the 

 endostome), they are nearly obliterated. 



The genus Banareia apparently connects the genera Actcea and 

 Atergatopsis, and will have, perhaps, to be united with the latter, 

 with which it agrees in the somewhat broader basal antennal joint 

 and narrow naked acute finger-tips. 



42. Xantho macgillivrayi. (Plate XX. fig. C.) 



Carapace transverse, of the form usual in this genus, with the 

 cervical suture and the depressions separating the prominences of 

 the postfrontal, gastric, hepatic, and branchial regions very distinct ; 

 these lobules are themselves granulated, the granules being for the 

 most part disposed in short transverse raised lines or low ridges, 

 which are most prominent on the anterior part of the carapace ; the 

 intestinal region is plane and more or less punctulated. The front 

 is rather prominent, and (in an adult example) more than one fourth 

 the greatest width of the carapace, and is divided by a very slight 

 median notch into two truncated lobes, exterior to which on each 

 side is a small and less prominent tooth, formed by the inner and 

 upper angle of the orbit ; the antero-lateral margins are armed with 

 four rather small but acute and well-defined teeth, which increase 

 regularly in size from the first to the last ; the subhepatic and ptery- 

 gostomian regions and the postero-lateral margins of the carapace 

 are granulated. There is a small tooth at the outer and another 

 at the inner suborbital angle. The male postabdomen is 5-jointed, 

 the third to fifth segments coalescent; that of the female is 7-jointed. 

 The eye-peduncles are small, and thickened at their bases. The 

 basal antennal joints are in contact with the subfrontal lobes. The 

 outer maxillipedes present nothing remarkable, having the ischium- 



* Annales de la Soc. Entoni. cle France, ser. 4, ix. p. 168, pi. viii. (1869). 



p2 



