4 2o CRUSTACEA. 



Length, 6 lines; breadth, 6'1 lines, being greatest a little anterior 

 to the middle. 



P. punctata, Guerin, Bull, de la Soc. des Sci. Nat. de France. 

 P. cristata, Edwards, Crust., ii. 254. 



PORCELLANA TUBERCULATA, GuSrUi. 



Valparaiso, Chili; San Lorenzo, Peru. 



Length of carapax, 5*4 lines; breadth, 57 lines. Colour, brownish 

 red with a tinge of purple; the prominent surfaces of the carapax 

 blue with a purplish tinge; purplish below. The surface of the cara- 

 pax is short downy, like the tuberculifrons, excepting the low promi- 

 nences. The front has three nearly equal and similar points, each 

 with a small tubercle above. The carpus has five or six denticulate 

 teeth, rather broad and partly rounded; and there is a row of small 

 tubercles or granules some distance from the posterior margin. 



Porcettana tuherculata , Guerin, Bull, do la Soc. des Sri. Nat. de France. Seance du 

 23 Dec, 1835, p. 115, and Mag. de Zool., 1838, p. 6, pi. 2*',, f. 2. 

 P. lobifrons, Edwards, Crust., ii. 250. 



PORCELLANA TUBERCUL1FR0NS, EdlCUVlh lliitl Llt'd*. 



Valparaiso. 



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

 face of the carapax is more even than in the tubvrvuhihi of Guerin 

 {lobifrons, Edwards); the middle lobe of the front has two small 

 tubercles above instead of one, and the outer lobes are subquadrate ; the 

 carpus has but two or three large teeth, and quite near its posterior 

 margin there is a range of small tubercles. The carapax and legs 

 have the surface short villous. 



P. affinu, Guerin, Bull, de la Soc. des Sci. Nat. de France, Seance du 2:; IK, . 

 1835 ; p. 116, and Mag. de Zool., 1838, p. 0. 



P. tubercuUfrons, Edwards and Lucas, D'Orb. ('rust. S. A., 33. The name „dr«/, 

 was previously applied to another Porcellana by Gray. 



