408 BULIvETIN OF THE BUREAU OF FISHERIES. 



Genus UPOGEBIA Leach. 



Upogebia Leach, 1814. p. 400. 

 Upogebia afBnis (Say). PI. xxix, fig. 9. 



Gcbia affinis S&y, 1818, p. 241: Kingsley. 1880, p. 410. 



£//>09e6>a o^MW Stebbing. 1893, p. 185; Sumner, 1911, p. 666; Fowler, 1912. p. 108. 



Integument, save that of the dorsal part of the carapace and of the legs, more or less membranous. 

 Carapace about half as long as abdomen, its cephalic portion about twice as long as the thoracic; nearly- 

 flat above; anteriorly rugose, covered with short, rigid hairs and terminating in three acute points of 

 which the median considerably exceeds the lateral ones; a small, upcurved spine behind the eye; a 

 minute lateral spine just behind the cervical groove. 



Abdomen gradually increasing in width to the fourth segment. Fifth segment much narrower 

 posteriorly; sixth subquadrate. Lateral parts of third and fourth segments densely pubescent and all 

 with their pleurae marked off by an impressed line. Telson broad, subquadrate, with an impressed 

 median line. Caudal lamellae small, the inner one truncate and with a median rib and costate outer 

 border; the outer one rounded at tip and with two ridges. 



Eyestalks concealed, pubescent above; corneal surface small. Antennae a little less than twice as 

 long as carapace. Chelipeds stout; chelae fringed with long hairs beneath, with an external dentate ridge 

 above, a median row of acute spines and an internal line of stiff hairs; immovable finger smooth, curved 

 and with a small tooth near the middle; movable finger much longer, denticulate above at base; carpus 

 grooved on outer face, with a row of small spines below, a row of small teeth above on inner margin, six 

 acute spines along the distal margin above and a strong marginal spine below; meros with a small spine 

 above and a fringe of long hairs beneath. First pair of walking legs ciliate at tips and along lower margin ; 

 foiulh article with a strong spine at base. Second, third, and fourth legs ciliate at tips. 



Length, 40 to 60 mm. 



Color, a light gray or yellowish gray, the cilia darker. 



At Beaufort this crustacean occurs in various parts of the harbor in burrows which it digs to a depth 

 of about afoot in muddy sand between tide levels. The margins of Town Marsh, of Pivers Island, and 

 the projecting shoal above the fish factory are favorable collecting grounds. In the latter locality an 

 hour's work at low tide has brought to light as many as 50 specimens ranging from very young to full- 

 grown individuals. Females carrying eggs may be collected at almost any time during the summer. 

 A small percentage of the adults have been found to carry a large isopod parasite {Pesudione upogebuB 

 Hay)" in the right or left branchial chamber. 



Tribe PAGURIDEA. 



Anomura having the abdomen usually well developea but nearly always asymmetri- 

 cal, soft and twisted or bent under the thorax, and with the appendages of its sixth 

 segment, when present, adapted for holding the body in hollow objects. 



This tribe includes 4 families, i of which is represented within the Beaufort limits. 



Family PAGURIDAE. The hermit crabs. 



Marine Paguridea having an asymmetrical, soft, spirally twisted abdomen whose 

 appendages, except those of the sixth segment, are greatly reduced in size or wanting; 

 the antennal scale is thornlike, the stalks of the first antennae are of moderate length and 

 their flagella end in a filament. 



Of 31 genera, 7 occur in the Beaufort region. 



KEY TO THE GENERA OF THE BEAUFORT REGION. * 



a. External maxillipeds approximated at base; chelipeds subequal or the left is much larger than the 

 right; very rarely is the right slightly, never is it much, larger than the left . . (Subfamily Dardanina:). 



o Hay: Proc. U. S. Nat. Mus., vol. 41, p. 572, 1916. 



' This key is taken, with modifications, from Alcock, Cat. Ind. Decapod. Crust, in Indian Mus., part U, 1905. 



