114 THE VOYAGE OF H.M.S. CHALLENGER. 



Pachycheles barhatus, A. Milne-Edwards (PI. XL fig. 4). 



Pachycheles barhatus, A. Milne-Edwards, Bull. Soc. Philom. Paris, ser. 7, t. ii. p. 228, 1878. 



Habitat. — St. Vincent, Cape Verde Islands. 



The carapace of the single specimen, a young male referred with some hesitation to 

 this species, measures 4*5 mm. in length and 4 mm. in breadth. The carapace is 

 flattened, with the front depressed ; a few slight granulations are seen towards the 

 lateral borders on the gastric and hepatic areas, and a series of transverse lines occurs 

 on the branchial areas. The front is pubescent and obscurely trilobed, bounded 

 posteriorly by two transverse ridges on the gastric area, at the point where the carapace 

 becomes level. The chelipedes are granulated and pubescent above, the hairs with 

 which they are clothed being short and stiff; the anterior border of the carpus bears 

 from three to five acute teeth, and the lower surface of the propodus is glabrous, with 

 numerous rounded granulations towards the outer border. The ambulatory limbs are 

 moderately pubescent. 



The type-specimen came from the Cape Verde Islands. 



Pachycheles pulchellus (HasweU). 



Porcellana pidchella, Haswell, Proc. Linti. Soc. N.S.W., vol. vi. p. 758, 1881 ; Catal. Austral. 



Crust, p. 148, 1882. 

 Pachycheles pulchellus, Miers, Crust, in Zool. H.M.S. "Alert," p. 273, pi. xxx. fig. A, 1884. 



Habitat. — Station 186, Fhnders Passage, North Australia; depth, 8 fathoms; bottom, 

 coral mud. A female with ova. 



Station 188, Arafura Sea, South of Papua ; depth, 28 fathoms; bottom, green mud. 

 A female with ova. 



The specimens described by Haswell and Miers were taken at various localities on the 

 northern coasts of Australia. 



Genus Polyonyx, Stimpson. 



Polyonyx, Stimpson, Proc. Acad. Nat. Sci. Pliilad., p. 67, 1858. 



Carapace suborbicular, smoothly convex, the breadth slightly greater than the 

 length. Front but little produced, with an almost straight margin. First joint of the 

 antennular peduncle smooth ; the corresponding joint of the antennal peduncle greatly 

 elongated. Eyes of small size. Chelipedes smooth, with the merus broad. Dactyli 

 of the ambulatory limbs short, and furnished with two or more well-developed claws. 



