10 



l.lil'TOl'OUIAIXK. 



DECAPOD A. 



URACIIYURA. 



LEPTOPODIA DJE. 



CRANCITS SPIDER-CRAB. 



Achfcus Cranchii. Leach. 



Specific diameter. " Carapace, with two tubercles in the median line, and 

 with two elevated lines between the eyes." LEACH. 



Acliams Cntnchii, LEACH, Malac. Brit. XXII. C. Ed. 2. LATR. Reg. Anim. 



IV. p. 04. EDW. Hist. Crust. I. p. 281. 



THE carapace of this interesting species, is triangular, 

 contracted behind the orbits, then enlarged into a promi- 

 nent point or tubercle, then again contracted, and finally 

 enlarged and rounded at the sides of the branchial regions. 

 Two conspicuous elevations, or tubercles, occur on the 

 median line, with an inconspicuous one between them ; and 

 the branchial regions arc elevated and rounded. The ros- 

 trum is extremely small and bifid, as broad as it is long. 

 The orbits are small and open above, and the eyes exposed 

 almost to the insertion of the peduncles, which are long, 

 cylindrical, furnished with a small rounded tubercle on the 

 anterior part, about the middle of its length, and standing 

 directly outwards ; not retractile. The antenna? and the 



