WILLEMOESIA INORNATA. 125 
by reference to the descriptions and figures of those species by Bate and 
Smith. 
But an East Indian species, Polycheles beaumontii,* bears the closest like- 
ness to P. granulatus. Indeed, the resemblance between these two forms 
is so great that I am inclined to regard P. beaumontii as, at most, but a geo- 
graphical race of P. granulatus. P. beaumontii is known through a single male 
specimen captured at a depth of 675 fathoms, off Colombo, Ceylon. I have 
no doubt that its most striking peculiarity, viz. the absence of the usual in- 
ternal lobe or “scale” of the basal segment of the antennule, is due to 
malformation or mutilation. The other characters which distinguish this 
species from P. granulatus are very slight: the number of lateral spines on 
the carapace is 7 (or 8) —3—13 in P. beaumontii, 9 (or 10)—3—15 in 
P. granulatus ; the ophthalmic sinuses are a little broader in the former 
species than in the latter; the arrangement of the spinules in the median 
line of the gastric area of the carapace is 1. 2.1 in the former, 2. 2. 1 in 
the latter; the larger spines on the lower margin of the merus of the great 
chelipeds are rather nearer the proximal end of the segment in P. beaumontu 
than in P. granulatus. 
As there is but one specimen of Polycheles granulatus in the “ Albatross” 
collection, I have not examined the arrangement of the branchiz in detail. 
I have noted, however, that the normal epipods are present and well 
developed. 
WILLEMOESIA Grote. 
Deidamia W.-Suum, Nature, VIII. 51, 1873 (nom. preoc.). 
Willemoesia Grote, Nature, VILI. 485, 1873. 
Willemoesia inornata Fax. 
Plate XXXII, Fig. 2; Plote XX XIII, Fig. 3. 
Bull. Mus. Comp. Zool., XXIV. 195, 1893. 
Similar to W. leptodactyla (W.-Suhm), but readily distinguished from that 
species by the small number of spines on the margin and dorsal ridges of 
the carapace. The armature of spines may be formulated as follows : — 
Marginal ..... 5 to§ —2 to 3 — Oto 6. 
Median ridge .. 1to5—0. 
* Pentacheles beaumontii Alcock, Ann. Mag. Nat. Hist., 6th Ser., XIII. 236, 1894; Ill. Zool. R. I. 
M.S. “Investigator,” Crustacea, Plate VIII., Fig. 3, 1894. 
