MR. E. J. MIERS ON THE OXYSTOMATOUS CRUSTACEA. 239 



margin smooth, not beaded, and . not defined at either extremity, its cavity above 

 the base of the anterior legs filled with a short close pubescence. Upper surface of 

 arm with a group of small tubercles at base, followed by two larger, and with a 

 patch of dense short pubescence. Anterior and posterior margins with a line of 

 tubercles ; lower surface densely tuberculated ; wrist and hand smooth, fingers 

 straight. Colour greenish grey, with a series of eight marginal spots of darker 

 green, two spots of the same colour on the gastric region, and four on the cardiac 

 region. There are also two white spots on each side of the gastric region. Ab- 

 domen of male smooth, with all the joints except the last coalescent. Length nearly 

 1 in. ; breadth f in. 

 Sab. Western Australia, Shark's Bay. 



This species is most nearly allied to L. pallida, Bell, but differs from it in the form of 

 the thoracic sinus, which is wider in front ; the arm of L. pallida has not the patch of 

 pubescence on its upper surface at base that always exists in specimens of L. pubescens ; 

 the hand is slenderer, with a granulated line on its inner margin. 



Mvba, Leach. 



Mtra mammillaris, Bell. (Plate XXXVIII. figs. 25-27.) Some specimens from 



Australia, in the British-Museum collection, differ in several particulars from the 



adult specimens of M. mammillaris, but are, I think, the young of that species. In 



these examples the carapace is scarcely longer than broad, and there is a faintly 



marked longitudinal median carina. The hepatic regions are more strongly convex, 



the pterygostomian regions more decidedly angulated ; the tubercles on the posterior 



margin of the carapace are more conical (though not acute), the anterior legs are 



much shorter, and the tubercle on the penultimate segment of the abdomen of the 



male much more prominent than in adult specimens of M. mammillaris. Length 



f inch ; breadth f inch. 



It is probable, if this determination be correct, that both M. carinata and 31. elegans, 



Bell, are founded on specimens that have not attained quite their fall size, and that the 



median carina, characteristic of these species, will be found to disappear entirely in fully 



matured animals. Should, however, the examination of a larger series of specimens 



prove the examples above described to be specifically distinct from M. mammillaris, they 



may be designated by the name of M. angulata. 



Ntjbsia, Leach. 



1. Nursia sintjata, sp. n. Carapace moderately convex, broader than long, with three 

 tubercles placed on the cardiac region in the form of a triangle, a longitudinal 

 median ridge extending from the front to the posterior margin, and a transverse 

 curved ridge that extends from the cardiac region to the second tooth of the pos- 

 terolateral margin. There is also a slight elevation in front of each anterior tubercle 

 of the cardiac region. There are well-marked depressions between the ridges 

 towards the margins. Posterolateral and posterior margins deeply sinuated, with 



