tween regions of carapace not markedly deep; 

 surface coarsely punctate or eroded, and with 

 numerous granules and tubercles, larger tubercles 

 more or less spiniform and arranged as follows: 

 five on gastric region, three on cardiac, one on 

 each side of urocardiac lobe, five on branchial, 

 and one on each hepatic region. Anterolateral 

 margin of branchial region with six small teeth, 

 below and behind last tooth a broad triangular 

 tooth, and still lower on ventral surface a spine 

 visible between ischia of cheliped and first leg. 

 Median rostral tooth narrow, produced, dentic- 

 ulate at base, an acute forward-pointing tooth 

 over each antennular cavity. Orbit with several 

 spines on outer margin, a suture above, open 

 below; eye with small spine on upper surface. A 

 conical spine or tubercle on each side of sternum 

 near base of chelipeds. 



Chelipeds long, slender (length of merus ap- 

 proximately 1.3 times width of carapace), pris- 

 matic, upper surface finely rugose. Merus and 

 carpus with an irregular row of dentiform tuber- 

 cles near middle of upper surface, on inner and 

 outer margins, and near outer margin of hand. 

 Upper margin of hand with row of 18-20 ir- 

 regular teeth, largest near base of fingers but 

 decreasing in size both proximally and distally; 

 outer margin with 4 to 6 larger teeth and many 

 intermediate smaller ones. Walking legs long, 

 slender, bare, and almost smooth. 



Second segment of abdomen with sharp trans- 

 verse crest. 



Measurements. — Carapace: male, length, 20 

 mm. ; width, 21 mm. Length of merus, 30 mm. 



Variations. — The rostrum may be broadly tri- 

 angular, subentire, instead of tridentate with 

 denticulate margins. In young individuals the 

 pterygostomian ridge is less developed anteriorly, 

 and the post orbital constriction is more evident. 



Color. — Light buff, somewhat marbled with 

 purple, chelipeds and legs with broad bands of 

 purple. 



Habitat. — The species has been reported from 

 predominantly sandy or broken-shell bottom 

 (Rathbun, 1925) ; 25 to 115 fathoms. 



Type localities. — Off the Marquesas, Carysfort 

 Reef, and Conch Reef, 40 and 49 fathoms [south- 

 ern Florida]. 



Known range. — Off Capes Hatteras and Look- 

 out, N.C.; Gulf of Mexico near Pensacola, Fla., 



through Florida Straits; Puerto Rico; Trinidad; 

 between British and Dutch Guiana. 



Remarks. — Ovigerous females have been taken 

 from southwestern Florida in March (Rathbun, 

 1925), and off the Guianas in September (U.S. 

 National Museum records). 



Parthenope (Platylambrus) serrata (H. Milne Edwards) 

 Figures 247, 252B 



Lambrus serratus H. Milne Edwards, 1834, p. 357. 



Platylambrus serratus: Hay and Shore, 1918, p. 463, pi. 39, 

 fig. 7. 



Parthenope serrata: Rathbun, 1925, p. 516, pis. 180-181 ; pi. 

 275, figs. 7-10 (rev.). 



Recognition characters. — Carapace depressed, 

 width approximately 1.5 times length; convex 

 anterolateral margin of branchial region with 

 seven to nine triangular teeth in front of long, 

 flat, lateral spine. Posterolateral margin concave; 

 posterior margin convex, wide, both margins to- 

 gether with seven tubercles noticeably larger than 

 others, each terminating an indefinite longitudinal 

 or oblique line of tubercles. Elevations of cara- 

 pace ornamented with numerous unequal granu- 

 lated tubercles; depression between gastric and 

 branchial regions deep. Rostrum short, tridentate, 

 narrow at tip, and with raised margin continuous 

 with superior wall of orbits. Pterygostomian and 

 subhepatic regions with an excavation reaching 

 margin of orbit and, with chelipeds retracted, 

 forming covered efferent passages. 



Chelipeds, when extended, approximately 2 to 

 2.5 times as long as carapace, trigonal, smooth 

 beneath, more or less tuberculate on upper sur- 



Figubb 247. — Parthenope (Platylambrus) serrrata (H. 

 Milne Edwards). Male in dorsal view, 10 mm. 

 indicated. 



MARINE DECAPOD CRUSTACEANS OF THE CAROLINAS 



267 



