ANOMOURA PORCELLANIDEA. 4^9 



PORCELLANA DENTATA ? Edw. 



Specimens from the Paumotu Archipelago (Waterland, Raraka, 

 CarlshofF, and other islands), lost with the wreck of the Peacock, are 

 mentioned as follows, in the author's note-book, and may pertain to 

 the P. dentata. 



" Colour, dark brownish purple to brownish blue and dark ash- 

 brown ; fine dark blue to purple below. Beak triangular, rounded, 

 having a deep longitudinal furrow above. Carpus with four serra- 

 tures." 



PORCELLANA MITRA. 



Carapax Icevis, depressus, orbiculato-ovatus, anticd triangulatus et mi- 

 nute denticidatus aid spmulosus, margine orbitd non excavato. Pedes 

 antici graciles, scabriculi ; manus iyerang%ista ; carjms oblongus, intus 

 subacute 2-dentatus; brachium apice instar spince production. Pedes 

 sequentes superficie scabriculi, nudi. 



Carapax smooth, depressed, round-ovate, triangulate anteriorly and 

 margin minutely spinulous or denticulate, not excavated by orbit. 

 Anterior feet slender, somewhat scabrous; hand very narrow; 

 carpus oblong, having two narrow pointed teeth ; arm produced at 

 apex into a spine or tooth. Following feet with the surface sca- 

 brous, naked. 



Plate 26, fig. 9 a, animal, enlarged; b, extremity of abdomen. 



Island of San Lorenzo, Peru, under stones at low tide. 



Length, two and a half lines. Colour, dark and dull violet, with a 

 longitudinal whitish band along the middle of the back of the thorax, 

 and also of the abdomen. The outline of the front is directly con- 

 tinuous with that of the sides, without any notch or emargination, 

 and the margin is entire, except the minute spines or denticulations ; it 



