198 PERCY SLADEN TRUST EXPEDITION 



16. Calappa alata, sp. nov. (Plate 15, fig. 2). 



Amirante, 34 fms., Sta. E 9 ; 2 $. 



Dimensions. — J, apparently adult, C. 1. extreme 17 '9 mm., C. b. between sinuses just 

 in front of clypeiform expansions 18 "4 mm., C. b. extreme 2T8 mm. 



A narrow species ; width, exclusive of expansions, a little greater than length. 

 Surface depressed ; anterior f covered with granulated tubercles arranged somewhat 

 in longitudinal lines and separated by granules ; posterior f- crossed by transverse 

 granulated lines, sparsely edged with fine hairs, and separated by almost smooth spaces. 

 Front, 1^ times as wide as either orbit, formed of two oblique lobes deeply separated 

 by a notch rounded at the base. Intersutural lobes of the orbital margin shallow. 

 Antero-lateral margin slightly arched, separated from the clypeiform expansion by a 

 distinct re-entering angle, and cut into 11 shallow but well defined teeth. Greatest 

 transverse width of clypeiform expansion | as great as the extreme dimension in an 

 inwardly oblique antero-posterior direction, and cut into 9 teeth, there being three notches 

 on posterior margin. Antennae twice as long as width of orbit. Endostomial septum 

 extending vertically from the level of the front to the mouth, thickening posteriorly, 

 anterior edge convex. 



Crest at distal end of arm faintly four-lobed ; upper surface of wrist and outer surface 

 of palm granulate, and with a few tubercles, an oblique line of regular granules on lower 

 part of outer surface of palm. Sixth segment of abdomen of male a little wider than long; 

 seventh segment as long as sixth is wide. 



This species is very near C. depressa Miers* from the south Australian coast, 2 to 

 10 fathoms, which differs in its relatively narrower and more triangular carapace, the 

 wings following the antero-lateral outline ; obscure antero-lateral teeth ; nearly transverse 

 frontal lobes ; in having two regular lines of granules on lower half of outer surface of 

 palm. 



17. Mursia spinimanus Rathbun (Plate 15, fig. 5). 



Mursia spinimanus Rathbun, Bull. U. S. Fish Comm. for 1903, pt. in, 1906t, 

 p. 888, pi. 16, fig. 1, text-fig. 41. 



Saya de Malha, 125 fms., Sta. C 2 ; 1 ? juv. 



Dimensions. — C. 1. extreme 17'2 mm., C. b. at anterior base of spines 19'7 mm., 1. of 

 spine on anterior margin 4 "7 mm. 



This specimen is rougher, as to granules and tubercles, than typical spinimanus ; the 

 3 posterior teeth are about as prominent as in the very much larger type specimen, 

 but they are more prominent than in young Hawaiian spinimanus of somewhat larger 

 and smaller sizes. 



* Challenger Rept., Zool., xvii. 1886, p. 287, pi. 23, fig. 2. 



t For the sake of brevity, this report will be referred to further on as "Rathbun, 1906." 



