1895.] 
251 
A. Alcock— Garcinological Fauna of India* 
zontal portion of the carapace, and the length of the 2nd joint is less 
than one-third the breadth of the rostrum at its own point of origin—- 
the joint also being somewhat broadened. 
The chelipeds also vary. In certain males, both adult and young 
(var. mascarenica partim), they are stouter than the other legs, are 
very variably granular, are a little longer than the carapace, have the 
hand very variably broadened and inflated, and the fingers closely 
apposable only at tip. In all females they are a 
little shorter than the carapace, are quite smooth, are rather slenderer 
than the other legs, and have slender palms, and fingers that are closely 
apposable in the greater part of their extent. In 
certain other adult males they are intermediate in condition, approach¬ 
ing more to the female type. 
The ambulatory legs are moderately stout and are hairy : the 1st 
pair, which are the longest, are rather longer than the chelipeds ; the 
others decrease gradually in length. 
Miers’ valuable paper, Ann. Mag. Nat. Hist., 1885, Yol. XY. pp. 
6-8 should be consulted. After examining over forty specimens from 
the Andamans I adhere to Kossmaun’s synonomy and opinion (loc. cit.) 
The characters upon which the separation of M. mascarenica from 
M. philyra is based are all variable; and I think that we have here to 
deal with a case of male dimorphism, such as is known to occur in 
certain Beetles, where one form of male is aberrant from the female 
type while another form of male resembles the female in certain par¬ 
ticulars : vide Bateson and Brindley, Variation in Secondary Sexual 
Characters, P.Z.S., 1892, p. 585. 
Micijppa thalia , Herbst. 
Cancer thalia , Herbst, Krabben, III. iii. 50, tab. lviii. fig. 3. 
Micippa thalia, Gerstacker, Archiv. fur Naturgesch , XXII. 1856, p. 109; and 
Adams and White, ‘ Samarang’ Crust., p. 15; and A. Milne-Edwards, Nouv. Archiv. 
du Mus., VIII. 1872, p. 238, pi. xi. fig. 1; and Kossmann, Reise Roth. Meer., Crust, 
p. 8 (et varr.) ; and Miers, Zoology H. M. S. ‘Alert,’ pp. 182 & 198, and Ann. Mag. 
Nat. Hist., 1885, Yol. XY. p. 10 (ubi synon.), and ‘Challenger’ Brachyura, p. 70; 
and [Cano., Boll. Soc. Nat., Napol., III. 1889, p. 179] ; and Ortmann, Zool. Jahrb. Syst., 
etc., YII. 1893, p. 60; and Henderson, Trans. Linn. Soc., Zool., 1893, p. 348. 
Micippa thalia ( =var. aculeata), de Haan, Faun. Japon. Crust., p. 98, pi. xxiii. 
fig. 3; and Krauss, Sudafr. Crust., p. 51; andBianconi, Mem. Ac., Bologna, III., 1851, 
p. 103, pi. x. fig. 2 ; and Kossmann, Reise Roth. Meer., Crust., pp. 5 and 8, pi. iii. 
fig. 5; and Hilgendorf, MB. Akad., Berl., 1878, p.786; and Richters, Mobius, Meeres- 
fauna, Maurit., p. 142; and Miers, Ann. Mag. Nat. Hist., 1885, Vol. XY, p. 11 (ubi 
synon.)’, and De Man, Journ. Linn. Soc., Zool., Yol. XXII. 1888, p. 20; and Mary 
J. Rathbun, Proc. U. S. Nat. Mus., Yol. XYI. 1893, p. 92. 
J. ii. 32 
