THE DECAPOD AND STOMATOPOD CRUSTACEA I45 



Family PORCELLANIDiE. 

 PETROLISTHES ARMATUS (Gibbes). 



Porcellana armata GuMW.s, Proc. Amer. Assoc. Adv. Sci., ill, 190, 1850. 

 Porcellana leporina Heller, Reise Novara, 78, pi. vi, fig. 7, 1865. 

 Petrolisihcs armatiis Simvso'^, Proc. Acad. Nat. Sci. Phila., x, 227, 1858. 



Mamanguape stone reef ; eleven specimens. 



Rio Goyanna stone reef; six specimens. 



Maceio coral reef ; one specimen. 



Color. — Bright red and yellowish mottled. On the chelipeds the 

 red strongly predominates, the tubercles being red, the interspaces yel- 

 low. Propodal joints of ambulatory legs with two light transverse 

 bands, one at the distal end, the other near the proximal. 



PETROLISTHES SEXSPINOSUS (Gibbes). 



Porcellana sexspinosa Gibbes, Proc. Amer. Assoc. Adv. Sci., iii, 190, 1850. 

 Porcellana egregia Guerin, in La Sagra's Hist. Cuba, 2d part, vol. viii (Atlas), 



pi. II, fig. I, 1857. 

 Petrolisthes sexspinosus Stimpson, Proc. Acad. Nat. Sci. Phila., x, 227, 1858. 



Mamanguape stone reef ; three specimens. 



Stone reef at Boa Viagem, Pernambuco ; three specimens. 



Coral reef, Maceio, Alagoas ; seven specimens. 



Color. — Dark crimson in transverse broken lines on a white ground. 

 Similar oblique lines on chelipeds, showing a tendency to break up 

 into spots; outer margin, and also the margin of the dactylus, with a 

 row of crimson spots. Ambulatory legs with meral joints spotted ; 

 carpal joints speckled with crimson and with a white stripe on the 

 upper surface ; propodal joints crimson with two white bands, one at 

 the distal end, the other on the proximal half. Dactyli crimson, with 

 white toward the nail. 



PETROLISTHES SERRATUS Henderson. 



Petrolisthes serratus Henderson, Challenger Rept., Zool., xxvii, 107, pi. 

 XI, fig. 2, 1888. 



The single specimen, a male, agrees with Henderson's description 

 and figure, excepting that the inner border of the carpus of the right 

 cheliped (the left is missing) has only four teeth, the small distal fifth 

 tooth figured by Henderson being absent, and the dactylus is shorter 

 than in the type, being 4.2 mm. long, while the inner margin of the 

 propodus measures 6.4 mm. The dactylus has a large basal tooth, 

 and a smaller tooth next it. Henderson says that the dactylus is 

 " almost equal in length to the hand." His type was from off Bahia in 



