by Rev. T. R. R. Stebbing. 3 
Famity PARTHENOPIDA. 
For this tribe and family see Ann. 8. Afr. Mus., vol. vi, pt. 4, pp. 
283, 292; 1910. 
Genus PLATYLAMBRUS, Stimpson. 
1871. Platylambrus, Stimpson, Bull. Mus. Comp. Zool., vol. ii, p. 
129 (Rathbun). 
1873. P., A. Milne-Edwards, Crust. Mexique, p. 146. 
1895. P. (Subgen), Alcock, J. Asiat. Soc. Bengal, vol. Ixiv, pt. 2, . 
Ep2209) 20 
1901. P., M. J. Rathbun, U.S. Fish. Comm. for 1900, vol. ii, p. 79. 
For this genus (or subgenus of Lambrus) Miss Rathbun gives the 
characters, ‘“‘Carapace strongly carinated or tuberculated, broadly 
triangular (considerably broader than long), with rounded sides and a 
broad but sharp-pointed projecting rostrum ; no postocular constriction. 
Chelipeds with arm and hand straight, sharply trigonal, the edges of 
these joints, as also outer edge of carpus, being very sharply and 
stoutly serrated.” 
In assigning species authors have overlooked or ignored the fact that 
Herbst uniformly prints Cancer pransor, not prensor (see Krabben 
und Krebse, vol. ii, p. 170, pl. 41, fig. 3, 1796, and, with improved 
definition, vol. iii, pt. 3, p. 38, 1803). -On the latter occasion he 
identifies with it Parthenope regina, Fabricius, Suppl. Ent. Syst. p. 
353, 1798. Also the species of late years called Platylambrus 
carinatus was instituted by Milne-Edwards as Lambrus carenatus 
(Hist. Nat. Crust., vol. 1, p. 358, 1834) and this spelling is retained 
by his son Alphonse Milne-Edwards in the Crust. Mem., p. 147, 1873. 
PLATYLAMBRUS QUEMVIS, sp. nov. Plate I. 
The present species is nearly allied to the other members of the genus, 
without fitting any of them. From P. pransor it is distinguished by 
wanting the great spine of the infra-orbital lobe; from P. carenatus 
by not having ‘the single, and very high and sharply cut carina on 
either branchial region” (Alcock), as well as differences in the hind 
border of the carapace ; from P. holdsworthii (Miers) by not having 
a dentate edge to the fourth joint of the ambulatory legs; from P. 
serratus (Milne-Edwards) by less proportionate width of carapace and 
the presence of two large teeth behind that which terminates the 
antero-lateral border; from P. validus, de Haan, by the strong 
