462 BULLETIN OF THE BUREAU OK FISHERIES. 



KEY TO THE GENERA OF THE BEAUFORT REGION. 



a. Carapace not laterally expanded. 

 b. Carapace rough, tuberculate or subspinous, 

 c. Carapace triangular, convex; pterygostomian and subhepatic regions not deeply excavated to 



form passages to the efferent branchial apertures Parthenope. 



cc. Carapace subrhomboidal, depressed; pterygostomian and subhepatic regions excavated so as 

 to form, in conjunction with the retracted chelipeds, passages to the efferent branchial aper- 

 tures Plalylambtis. 



bb. Carapace smooth Sohnolambus. 



aa. Carapace expanded laterally to form a vault beneath which the walking legs are concealed, 



Heterocrypta. 



Genus PARTHENOPE Weber. 



Parthenope "Weber, 1795. p. 9a. 

 Lambrus Leach. 1815. p. 30S, 310. 



KEY TO THE SPECIES OF THE BEAUFORT REGION. 



a. Margins of chelipeds denticulate or subspinous agona. 



aa. Margins of chelipeds with serrate tubercles and laciniate spines pourtalesii. 



Parthenope agona (Stimpson). PI. xxxix, fig. 5. 



Lambus agonus Stimpson, 1871, p. 131; A. Milne-Edwards. 1873-1880 [1878], p. 151; 1879, pi. 'xxvni. fig. 3; Rathbun, 1901, 

 P- 79- 



Carapace slightly (about one-eighth) broader than long, elevated along the middle line and with the 

 branchial regions inflated; surface coarsely punctate and with many more or less spiniform tubercles, 

 the larger of which are arranged as follows: Near *.he middle of the gastric region a transverse row of 

 four; behind these a longitudinal row of ioui larger ones; one on each side, marking the ends of the pos- 

 terior margin; four or five on each branchial region, the posterior one spiniform and turned obliquely 

 outward; one on each hepatic region. The margin of the branchial region bears five or six small teeth; 

 below and partly behind this is a short crest and below this a stout spine. Front produced, narrow at 

 the tip but broad and with raised margins proximally. Orbit with an open fissure above and a broad 

 gap below. A conical tubercle on the sternum at the base of the cheliped and a similar one on the 

 coxal article of that appendage. Proximal segment of the abdomen with a sharp transverse crest 

 forming a lobe in the center and a tooth on each side. 



Chelipeds very long and slender, prismatic, finely rugose above, denticulate on both margins and 

 with an additional row of denticles, median on the meros and carpus but approaching the outer margin 

 on the hand; the denticles on the margins of the hand are much stronger distally. Ambulatory legs 

 long, slender and nearly smooth. 



Length of carapace, 16 mm.; width, 17.5 mm. 



Color, light buff, more or less marbled with purple; chelipeds and legs with broad bands of purple. 



One specimen, a female, was taken by the Fish Hawk 23 miles east of Cape Lookout in 47 fathoms. 



Parthenope pourtalesii (Stimpson). PI. xxxix, fig. 6. 



Lambrus pourtalesii Stimpson, 1S71, p. 129. 



Lanibrus verrillii Smith, 1881. p. 415; ibid. 1883, p. 14; ibid, 1S87, p. 63S (24). pi. 11, fig. 2. 



Parthenope pourtalesii Verrill. 1908, p. 418. 



Carapace triangtilar, nearly as long as broad, somewhat tumid in the mid-dorsal and branchial 

 regions which are separated from each other by a pair of deep longitudinal depressions; surface every- 

 where minutely pimctate or eroded; median line with four strong spiniform tubercles, one of which is on 

 the gastric and three on the cardiac region; two small spines placed transversely in front of the gastric 

 spine; branchial region with a conspicuous, laciniated spine at the posterolateral angle from which a row 

 of two or three similar but smaller spines extends toward tlie gastric region; another row of from two to 

 five extends along the posterior margin, and another row extends forward along the anterolateral margin. 

 Rostrum directed obliquely downward, broad at the base and vnth conspicuous raised margins, but 

 suddenly contracted near the tip. 



/ 



