1916. | 5. Kempe: Notes on Crustacea Decapoda. 387 
border there are 2 in one specimen and 3 in the other. The telson 
in one case bears four pairs of dorsal spinules, in the other five. 
De Man has drawn attention to the great development of the 
third maxillipedes and first peraeopods in the male. In the two 
specimens obtained by Dr. Annandale this character is well shown, 
the proportions of the limbs agreeing precisely with de Man’s des- 
cription. The enlargement of these appendages in the adult male 
is a feature of considerable interest, for though apparently rare in 
the genus Sfirontocaris, an almost precisely similar phenomenon 
is met with in the genera Alope and Saron. 
9362 Tanabe, Kui prov., Japan. §. Yoshida. Two, 34, 36 mm. 
The third maxillipedes in the larger specimen are 30 mm. in 
length ; in the smaller they are 26 mm. 
Genus Thor, Kingsley. 
The definition of this genus requires modification in order to 
include T. maldiwensis, Borradaile, in which supraorbital spines 
are found on the carapace. In addition to the greater number of 
segments in the carpus of the second peraeopods and the presence 
of a movable plate at the distal end of the antennular peduncle— 
characters by which the genus is readily distinguished from Hippo- 
/yte—the outer antennular flagellum, in Thor, is greatly swollen 
in both sexes. 
An interesting species, hitherto undescribed, was obtained at 
Port Blair; it lives commensally with giant sea-anemones of the 
genus Discosoma and is very peculiar in its pigmentation. 
The three known species of Thor, all of which have been found 
in the Andamans, may be distinguished as follows :— 
I. Rostrum with two or more dorsal teeth; 
supraorbital spines absent. 
A. Apex of rostrum bifid; lateral process 
of antennule without a tooth at its 
proximal end ee ee 
ZL. Apex of rostrum simply pointed; 
lateral process of antennule with a 
small upstanding tooth at its prox- 
T. paschalis (Heller). 
imal end... Bae ... IL. discosomatts, sp.nov. 
II. Rostrum with only a single dorsal tooth ; 
supraorbital spines present  .,, ... L£. maldiveysis, Borra- 
daile. 
Thor paschalis (Heller). 
Igt4. Thor paschalis, Kemp, Rec. Ind. Mus., X, p- 94, pl. 1, figs. 6-10. 
Additional specimens are from Singapore and from Port Blair 
in the Andamans. ‘The species was found on several occasions in 
the latter locality, living among weeds at depths of from 2 to 5 
fathoms in the neighbourhood of Ross I. The specimens are 
smaller than the majority of those obtained in the Gulf of Manaar ; 
the largest is only 8 mm. in length and ovigerous females some- 
times do not exceed 6°5 mm. ‘The single individual from Singa- 
pore, a male, was obtained at low water under a block of coral. 
