200 PERCY SLADEN TRUST EXPEDITION 



cavity (except the tubercles at the outer corners) projecting beyond it in a strictly dorsal 

 view. 



Cheliped (only the right is present) very little longer than the carapace ; merus 

 swollen at distal end ; palm narrowing distally, slightly longer than fingers ; fingers 

 similar, longitudinally grooved, intervening ridges granulate ; a narrow slit between fingers 

 when closed. The first (and longest) leg is a little shorter than carapace. 



This species is considerably larger than any yet described. In the quality of the 

 granulation, it resembles H. vesiculosa Alcock*, but in that species the marginal spines 

 are strong, the chelipeds and fingers much longer. H. venusta Nobili t has a tooth on the 

 inner border of each lobe of the front, and the arm has a conical tubercle on its posterior 

 and its anterior border. H. mesanensis Rathbunj has a much moi'e uneven surface, and 

 no tubercle at the angle of the buccal cavity. 



Prcebebalia, gen. nov. 



(Prcebeo, to reach out ; Ebalia.) 



Distinguished from Ebalia chiefly by its very long chelipeds, more than three times 

 as long as carapace, with slender, prismatic palms, twice as long as fingers. 



Carapace wider than long, exclusive of the two posterior spines, less uneven than in 

 Ebalia ; hepatic and intestinal regions well marked. Extremity of maxillipeds and buccal 

 frame projecting beyond front, and pterygostomian region beyond hepatic region. Orbits 

 very open ; two open fissures above, a broad U-shaped fissure below. Merus of maxilliped 

 § as long as ischium, measured on inner margin. Legs unusually long and slender. 

 Sutures in coalesced abdominal segment (3rd, 4th and 5th) of $ visible. 



Type, Prcebebalia extensiva, sp. nov. 



20. Prcebebalia extensiva, sp. nov. (Plate 15, fig. 5). 



Saya de Malha, 125 fms., Sta. C 4 ; 4 $. Providence, 125 fms., Sta. D8; U type. 

 Seychelles, 34 fms., Sta. F 7; 1 t, 1 ?■ 



Dimensions. — $, C. 1. entire 127 mm., C. 1. middle 1T3 mm., width 13 mm., Ch. 1. 

 about 46 mm. 



Type £. — Extreme length of carapace nearly equal to extreme width; shape sub- 

 circular, antero-lateral and postefo-lateral distances subequal ; frontal region separated 

 by a depression from rest of carapace ; surface finely and closely granulate with coarser 

 granules behind and below the front ; intestinal and hepatic regions conical, tipped by 

 a tubercle ; an interrupted furrow either side of cardiac region ; 2 posterior spines sub- 

 conical, acuminate ; a tooth at lateral angle of carapace. Front bilobed by a deep furrow, 

 edge truncate in dorsal view, with small U-shaped median emargination. Of the two 

 upper orbital fissures, the inner is wider and deeper than the outer ; lower sinus deeply 

 U-shaped, with a tuberculiform tooth at inner angle ; inner gap of orbit not completely 



* Journ. Asiat. Soc. Bengal, lxv. 1896, p. 177, pi. 8, fig. 1. 



t Bull. Mus. hist, nat., 1906, No. 5, p. 260. % Proc. Biol. Soc. Wash., xxii. 1909, p. 107. 



