General Catalogue of South African Crustacea. 357 



1900. P. d., Stebbing, S.A. Crustacea, pt. 1, p. 28. 



No. 4lA, sent by Dr. Gilchrist, from lat. 34 3' 15" S., long. 

 18 31' E. 

 1905. P. d., Alcock, Catal. Indian Decap. Crust., pt. 2, fasc. 1, p. 172. 



:;: PAKAPAGURUS BOUVIERI, n. sp. 

 Plate XLIII. 



The present species is distinguished from P. dimorplms by the 

 very different chelipeds of both male and female. From P. pilosi- 

 manus, S. I. Smith, with which A. Milne-Edwards and Bouvier unite 

 Henderson's P. abyssorum, it is distinguished by the eyes, which have 

 both the base of the eye-stalk and the cornea dilated. In the latter 

 respect it agrees with P. affinis, Henderson, but there the base of 

 the eye-stalk is not dilated, and the ophthalmic scale terminates in 

 from four to six denticles, instead of a simple subacute apex, as 

 in the other two species. The base of the eye-stalk, but not the 

 cornea, is somewhat dilated in the species or variety P. abyssorum. 

 Milne-Edwards and Bouvier speak of the first antennae in P. pilosi- 

 manus as having a four-jointed peduncle, but I think they have 

 been led by the two or three projecting points of the basal joint into 

 fancying a division where there was only an integumentary fold. 

 In the present species the eye does not quite reach the base of the 

 long third joint, which carries a finely tapering, setose flagellum of 

 about 2-4 articulations, with a slender secondary of eight or nine. 

 The setose acicle of the second antennae does not reach beyond the 

 peduncle, with the spinules of its inner margin only visible at a 

 particular angle ; the flagellum is very long and slender. 



The third maxillipeds have the third joint longer than the fourth, 

 its straight inner margin bordered with 14 spines. 



The chelipeds do not show any great divergence from those 

 described for the evidently somewhat variable P. pilosimanus. The 

 fifth and sixth joints are covered with a velvety pubescence, leaving 

 more or less bare the short thumb, to which the finger follows suit, 

 neither showing a corneous tip. The second and third perasopods 

 are also in close agreement with those of the primary species, both 

 elongate, but the second notably shorter than the third. It seems 

 to me that in this species, contrary to what is said to be the custom 

 in the genus, the genital opening is discernible in the basal joint of 

 the third peraeopods on the right side as well as on the left. The 

 short fourth peraeopods have the padded border closely set with 

 plumose setae, but so feebly produced as to give but little holdfast to 



