CRUSTACEA iXORTH PACIFIC EXPLORING EXPEDITION 179 



Genus PETALOMERA Stimpson 



The carapax in this genus is oblong or subovate, longer than 

 broad, and with the exception of the epimera well indurated. The 

 epimera, or sides beneath the lateral sulci, are membranaceous, being 

 protected by the expansions of the meros-joints of the feet. The 

 front is prominent and tridentate. Lateral margins convex, with 

 no prominent angle. The facial region is sufficiently broad, with 

 the antennae closely packed and flattened on their outer sides, show- 

 ing an even surface. Buccal area rather small, neatly filled by the 

 external maxillipeds, and much broader anteriorly than posteriorly. 

 Palate armed with ridges. Anterior margin of meros- joint of ex- 

 ternal maxillipeds oblique. The meros-joints of the anterior three 

 pairs of feet are dilated above with rounded lamelliform expansions. 

 The extremities of the fingers of the chelipeds are cochleariform and 

 corneous. The posterior two pairs of feet are much like those of 

 Dromia, the last pair longest. 



285. PETALOMERA GRANULATA Stimpson 

 Plate XXI, Fig. 4 



Pctalomera grauidata Stimpson, Proc. Acad. Nat. Sci. Phila., x, p. 240 

 [78], 1858. 



Carapax convex, sparsely but conspicuously granulated. The lat- 

 eral sulcus is situated at the posterior third of the length. Frontal 

 median tooth inferior and very small ; lateral ones very prominent ; 

 supraorbital tooth small ; outer orbital fissure closed. Three small 

 inconspicuous granulated teeth on the antero-lateral margin, between 

 the scarcely prominent orbital angle and the lateral sulcus, the first 

 one subhepatic. A small process on the second joint of the external 

 antennae. Feet all granulated except the posterior pair, which are 

 smooth. Chelipeds granulated and crested ; crest of carpus spinu- 

 lose ; a tubercle at the summit of the carpus and one at that of the 

 hand. The fingers are short, not gaping, with a transverse or 

 oblique ridge on the outer surface defining the corneous tips, and 

 having some resemblance in the side view to the bill of the Mormon, 

 or puffin. The superior margin of the lamellar dilatation in the 

 meros-joints of the feet is smooth and sharp. Color in life orange, 

 with reddish clouds. Length of the carapax in the male, 0.36; 

 breadth, 0.33 inch. 



