MONOGRAPH OF THE LEUCOSIADA. 283 
These were both known to the earlier naturalists. One of them is figured by Rumphius 
and Seba, and both by Herbst in his great repertory of crustacean animals, Fabricius 
Lichtenstein, Leach, Desmarest, and others down to Edwards, have restricted their potios 
to these two species. De Haan, in his admirable work on the Crustacea of Japan, fori: 
ing a portion of the great work of Siebold, adds four species, and Messrs. Adams and 
. White have described a seventh in the Voyage of the Samarang. The additions, however, 
which have recently been made to the carcinology of the Eastern Seas by Hinds, Macgil- 
livray and others, and especially by Mr. Cuming in his Philippine voyage, have enabled 
me to swell the list of distinct species to no fewer than twenty. 
LEUCOSIA URANIA, Herbst. Testa subglobosà, antic’ productä, fronte rotundato ; brachiis 
triedris, suprà ad basin tuberculis paucis; sinu thoracico usque ad latera regionis 
hepaticæ antice attingente, granis suprà marginato. 
Rumph. t. 10. f. A. B. Seba, iii. t. 19. f. 4, 5. 
Cancer Urania, Herbst, iii. t. 53. f. 3. 
Leucosia Urania, Leach, Zool. Misc. iii. p. 21. Edw. Règ. Anim. de Cuv., Crust. t. 25. f. 2; Hist. Nat. 
des Crust. ii. p. 122. | 
Hab. Maria orientalia. Muss. Brit., Bell. | 
The colouring of this species is remarkable. Of a general pale brownish-grey ; the 
front, and a large mark proceeding backwards from it are white; two large spots on the 
posterior part of the carapace, and two smaller ones on each lateral margin, the articula- 
tions of the fore legs, the basal portion of the fingers, and a ring on each joint of the 
ambulatory feet, are all of a more or less deep orange colour*. j 
Specimens of the species are not unfrequently brought with other objects from China, 
and these are almost always deprived of the abdomen, for the purpose of cleaning the 
interior. | 22 
The tubercles on the arms are disposed in a remarkable manner. On the upper side 
near the base there is a congeries of about five or six small ones, and immediately in front 
of them four large ones disposed in a quadrate form. On each margin there is a series of 
tubercles, which are large near the base, diminishing forwards. The anterior portion of 
the three sides is free from tubercles, excepting on the margins. 
LEUCOSIA CRANIOLARIS, Linn. Testà rhomboided, fronte tridentato ; brachiis serie tuber- 
culorum ad latera, et tuberculis duobus tantüm suprà ad basin. 
i 2E 17 
‚Cancer eraniolaris, Linn. Mus. Lud. Ulr. p. 431. Herbst, t 2. f j a 
Leucosia craniolaris, Fabr. Supp. p. 350. ‘Leach, Zool. Misc. m. p. 9]. Edw. Hist. Nat. des Crust. ii. 
p.122. . : 
Muss. Brit., Soc. Linn., Bell. 
Hab. ad oras maris orientalis. is 
This well-known species is easily distinguished from every other by the paucity ol , 
tubercles on the arm. The three sides are bordered, = in ug ere ee € 
| ing two above an 
tubercles, but there are no others, excepting s d de fect Duo, the 
beneath, at the base. The carapace is remarkab 
i colouring is not distinct, but these are probably bleached. 
* There are specimens in the British Museum in which this ds 
VOL. XXI. 
