South African Crustacea. 457 



MAXILLOTHRIX ACTAEIFOKMIS, 11. sp. 

 Plate CIX. 



In general aspect approaching Actaea hirsutissimus, having its 

 numerous tubercles surmounted by tufts of light-coloured, rather 

 stout setae. The inter-orbital front is not notched, and when its 

 contour is brought into view the lower margin of the orbit becomes 

 visible, portions of both pairs of antennae are in view, and the terminal 

 joints of the large third maxillipeds obtrude themselves, all together 

 making a picture difficult to represent distinctly. The antero-lateral 

 margins are divided into four lobules, followed by a very small one 

 which withdraws to the slightly convex postero-lateral margin. In 

 the male pleou the second segment is wider than the third, from which, 

 contrary to custom, the pleon widens slightly to the broad telson. Of 

 this the hind margin is bluntly triangular in the male, but rounded in 

 the female, the whole pleon fringed with setae in both sexes. In both 

 the segments between the second and sixth present obscure delimita- 

 tion. The male appendage of the large specimen was unfortunately 

 lost during manipulation, and that figured on a larger scale is from a 

 smaller specimen. 



The flagellum of the second antenna is as long as the peduncle. 

 The eyes have pale orange corneae. In the second maxillae the 

 vibratory lamina carries at the lower end three very unequal but all 

 very loiig setae a striking contrast to the species here assigned to 

 Nursia, in which this apparatus has no setae at all, but reminiscent of 

 the produced lower setae in Rkynchocinetes typus&nd of the long spine 

 in Axins longispina, recently described in these Annals (vol. 17, 

 pt. 4).' :: The principal joints of the third maxillipeds in the largest 

 specimen retained longitudinal stripes of orange and white. The 

 lower border of hand and thumb in the chelipeds is white and 

 polished, with a broad serrate apex overlapped by the obtuse-ended 

 finger, the curvature of which leaves a gap between it and the thumb. 

 The close matting of the palm above is in striking contrast with the 

 smooth lower border. The ambulatory limbs are very hirsute, with 

 the xmguis small and curved. Carapace of largest male, 14 mm. 

 broad, 12 mm. long; smaller male, 9 mm. broad, 7'5 mm. long. 



* In his ' Catal. Indian Decapod Const./ 1901, pi. A, Alcock shows two long 

 terminal setse on the second maxillse of his Homola andamanicus, but does not 

 notice them in the text. In 1882 S. I. Smith had called attention to the 

 remarkable length of the seta? in question in a species of Eumiersia (Nemato- 

 curcinus). Bate, 'Challenger Macrura,' p. 768, 1888, notes this as a character 

 of his genus Campylonotus. 



