MONOGRAPH OF THE LEUCOSIAD^. 301 



opening a little expanding forwards. Anterior legs in the male robust, rather more than 

 twice the length of the carapace ; the arm cylindrical, entirely smooth ; the wrist and 

 hand smooth and polished ; the latter somewhat tumid ; the fingers as long as the hand, 

 longitudinally grooved, armed with tubercles on the opposing edges, with a hiatus at 

 theu" base. The anterior legs of the female much shorter and smaller than in the male. 

 The remaining feet quite smooth and polished, the penultimate joint flattened, and with 

 sharp edges; the nail long and styliform. Abdomen in the male with the first two 

 segments waved, the thu"d, fourth, fifth and sixth united, and forming, with the seventh, 

 an elongated triangle somewhat hastate at the base, where there are two large elevations, 

 and there is a broad groove along the centre. In the female the second to the sixth joints 

 are imited, forming a large, very convex shield, and the seventh joint, which is very 

 narrow, is produced almost to the edge of the buccal orifice. 



Colour brown, with several small yellower spots placed symmetrically, four of which 

 are constant, and occupy the same situation as those which so distinctly characterize 

 Leucosia, and Avhich do not, I believe, exist Ln any others of the family. 



Length of carapace 0-9 in. 



I have received a large number of this interesting species from Port Adelaide in South 

 Australia. The males and females were nearly equal in number. It may be at once 

 distinguished from every other hitherto known, by the absence of all appearance of granu- 

 lations on every part of the body, and even on the arms. There are also some specimens 

 in the British Museum, from Van Diemen's Land, which differ from mine only in the 

 less degree of prominence of the tubercles on the male abdomen. 



Philtua Adamsii, mihi (Tab. XXXIII. fig. 1). Testa glabra, regionibus partim et 



linea longitudinaU granulatis ; margine posteriore utrinque bitubercidato. 

 Hab. ? Mus. Brit. 



The carapace of this little species is depressed, glabrous, with a granulated longitudinal 

 line and patches upon several of the regions, which are separated by shallow sulci ; front 

 emargiaate, posterior margin with two or thi-ee small tubercles on each side. External 

 pecUpalps with the palp not much dilated. Anterior legs more than twice the length of 

 the carapace ; arm subtriedi'ous, tuberculated above and below ; a line of small granules 

 on the outer side of the wrist ; hand vnih. a slight external and internal carina granulated ; 

 fingers sulcated. Male abdomen composed of fovir pieces, by the union of the second, 

 thu'd and fourth and of the fifth and sixth segments. 



Length of carapace 0*4 in. 



Obtained dm-ing tlie voyage of the Samarang, by Mr, Adams, after which indefatigable 

 and intelligent natiu-alist I have named the species. 



Philtea punctata, mihi (Tab. XXXIII. fig. 2). Testa orbiculari, Isevi, punctata; 



angulo pterygostomiano obsoleto ; bracliiis triquetris. 

 Hab. ad oras Africae occidentalis. Mus, Brit. 



Carapace nearly orbicular, smooth, punctate in every part ; the margin distinct, with a 



2e 2 



