PHTLLOBEANCHIATE CRUSTACEA-MACRURA. U? 



Tribe M O X O C A E, P I D E A. 



Family ATYIDJE. 



Genus 1. Xiphocaius, von Martens, 1872. 



Xiphocar'is, von Martens, Arch. f. Natnrjj. xxxviii. pt. 1, p. 139 (1872). 



" Rostrum slender, compressed, dentate, usually long. All the pereiopoda slender and 

 ■witli exopodites ; carpal joints of first two pairs without a distal excavation, articulating 

 in a normal way with the proximal end of the propodus. Abdomen with sixth segment 

 elongate; telson slender, truncate at tip." (-l/'O-y J. linf/Jjii,/,' The I5rachyura and 

 Macrura of Porto Piico,' p. 118.) 



1. XiPHoc.vRis cuRViROSTKis (Heller), G. M. Thomson, (Plate 29. figs. 2-13.) 



1865. Caridina curvirostr/s, Heller, Voy. Novara, Crust, p. 10,"). 



1870. Ciiridina currirostris, Miers, Cat. N.Z. Crust, p. 78. 



1879. Leander fluviatilis, G. ^M. Thomson, Trans. N.Z. Inst. vol. xi. p. ^.''i], pi. 10. lig. A -.1. 



Carapace nearly twice as long as deep, the lower margin curved in towards the 

 body ; front furnished with a prominent spine above and another Ixdow the eye- 

 socket. Rostrum slender and slightly curved upwards, 11-12-toothed above, beginnin;^ 

 as a slight crest on the carapace, with two or three teeth bi'liiiul the eyes, a central 

 group of four or live in front of the eyes, and three or four small teetii close to the 

 apex ; 4-()-toothed below. 



Picon having the second segment greatly dilated in the females, extending forward 

 over the posterior margin of the carapace; fourth and fifth segments with their infero- 

 posterior margins produced back into angular projections, which are more or less fringed 

 with setae. Sixth segment nearly as long as the fourth and fifth together. 



Telson (fig. 3) rather long, narrow, and slightly tapering ; on each margin it beai"s two 

 short spines on its distal half. The extremity is slightly round(!d and ends in two very 

 short marginal spines and about six slender short sette. 



The ophthalmopoda are nearly pyriform, the upper half being occupied by the large 

 rounded eye; the peduncle has a minute rounded lobe just at its base on the inner side. 



The first antennre (hg. 1) have the peduncle reaching almost as far as the extremity of 

 the rostrum. The first joint reaches beyond the ophthalmopod, and from the base of its 

 outer margin there projects forward a stout stylocerite, which reaches halfway along the 

 next joint ; its outer margin is also somewhat produced. The second joint is shorter 

 than the first, while the third is only about half as long as the second. The flagella are 

 both rather slender, the outer being imperfectly divided into two. 



The second antenna? (fig. 5) have a slender peduncle reaching only to the middle of 

 the second joint of that of the first pair; the second joint is jjroduced on its outer margin 

 into a short spine. The scaphocerite is produced along its outer margin into a spine 

 which reaches the extremity of the ^teduucle of the first antcnnie, while the oval-pointed 



