522 COLLECTIONS FROM THE WESTERN INDIAN OCEAN. 



threats as figured by Von Martens, reaching to the distal end of the 

 inner margin, which is toothed as in S. erythrceus ; this joint has a 

 convex shining prominence at its outer and distal angle. The merus- 

 joint is less deeply excavated where it is articulated with the ischium 

 than in S. erythrceus, and, as already stated, there is a tooth in the 

 notch on the inner margin where the carpus-joint is articulated 

 with it, and its extero-distal angle is produced and acute ; the lohe 

 on the inner margin of the exognath is acute. The chelipedes (in 

 the male) are of moderate length ; merus and carpus granulated ; 

 palm granulated above, and with a longitudinal series of gi'anules 

 on its outer and inner surface ; fingers arcuated and meeting (in 

 the adult) only toward the apices, where they are denticulated. 

 The ambulatory legs are slender and decrease in length from the 

 first to the last, the first pair being much elongated. Colour (in' 

 spirit) yellowish or purplish. Length of carapace (without rostrum) 

 9 lines (19 millim.). 



6. Pararnithrax (Chlorinoides) longispinus, De Haan, 

 var. bituberculatus. 



An adult but small male from Darros Island, 22 fms. (No. 185), 

 and two small males and a female obtained at Providence Island, 

 19 fms. (No. 217), are referred to this species, which has evidently 

 a wide Oriental distribution. 



They are distinguished from P. longispinus as figured by De Haan 

 merely by having the lower (immobile) finger as well as the daetylus 

 armed with a tooth or tubercle on its inner margin in the males, 

 and the upper margin of the palm straight aud entire, not dentated; 

 the spines of the carapace and legs are small. The anterior prae- 

 orbital spine is more or less recurved, as in De Haan's figure of the 

 Japanese type. 



Prom P. copplngeri, Haswell, referred to in the first part of 

 this Report, this species is distinguished not merely by the form of 

 the chelipedes, but by the less elongated carapace and ambulatory 

 legs. 



7. Hyastenus (Chorilia) oryx, A. M.-Edw. 



Two females and two small males are in the collection from 

 Providence Island, 19 fms. (No. 217). 



These specimens are of interest as showing the wide Oriental 

 distribution of this species, which had not previously been recorded, 

 I believe, from the Western division of the Indo-Pacific Region. It 

 has already been noticed in the first part of this Report (p. 195). 



8. Hyastenus (Chorilia) ovatus. 



Lahaina ovata, Dana, Amer. Journ. Sci. <!>- Arts, ser. m 2, xi. p. 269 

 (1851) ; U.S. Expl. Exped., Crust, i. p. 92, pi. ill. fig. 1 (1853 I. 



A small but adult female ia referred to this species from Poivre 



