370 CRUSTACEA. 



Plate 23, fig. 9, carapax, natural size. 

 Waterland Island, Paumotu Archipelago. 



Length of carapax, fourteen lines; breadth, fifteen lines. The 

 carapax is tuberculate, like the squamosa, and the tubercles are de- 

 pressed and edged with short scabrous hairs, as in that species; but the 

 number of teeth is less. As we have only a carapax, we cannot give 

 the characters from the legs and other parts. The range of tubercles 

 adjoining the posterior margin of the carapax, consists simply of three 

 linear parts, instead of being broken into smaller tubercles, as in the 

 squamosa. Moreover, the intramedial region is different : it consists 

 (beginning behind) of, first, a transverse crenate range, not divided (as 

 in the squamosa) ; then, instead of a continuous range of four largish 

 transverse tubercles, the four exist, but the two inner of these four 

 are placed a little more anteriorly, and exteriorly overlap a little the 

 outer, while behind the two inner there is a range of four minute 

 tubercles, forming a very narrow line between the inner termination 

 of the two outer. Anterior to these four, there is a transverse ridgelet 

 (as long as the two inner tubercles just alluded to), hardly divided at 

 middle, and corresponding to the two transverse tubercles in the squa- 

 mosa j it has two small crenatures or flattened tubercles upon its 

 posterior part, which correspond to a transverse line, more distinct 

 and isolated, and having the same position as in the squamosa. These 

 characters of the surface might be supposed to be subject to wide varia- 

 tions in the same species. We should not thus detail them from a 

 single carapax alone, if we had not found a striking uniformity in diffe- 

 rent specimens of the squamosa, both large and small, male and female. 



P. speciosa, Dana, Proc. Acad. Nat, Sci. Philad., 1851, v. 252. 



2. Artlculus pedum 8 ptosticor um otius nou midtiqrinosits. 



PlAGUsia tomektosa, Edwards. 



New Zealand; Illawarra, New South Wales; Cape of Good Hope. 



Length of carapax of a female, twenty-one lines ; breadth, twenty- 

 two and two-thirds lines; breadth of front between antennary sinuses, 



