DECAPODS 38 
Concepcion Bay, Lower California, and at stations 2824 and 282s in the 
Gulf of California, 7 and 8 fathoms. 
They agree with Dr. Holmes’s description, except that the fingers of 
the second pair of feet are only a little over half as long as the palm and 
the postero-lateral angle of the sixth abdominal segment is subacute. 
Family PANDALIDA, 
Genus Pandalus Leach. 
KEY TO THE SPECIES OF PANDALUS. 
A. Third segment of abdomen in part compressed and carinated, the 
carina forming a more or less well defined lobe or spine in front 
of the posterior margin. 
B. Third and fourth segments of abdomen armed with a median spine 
on posterior margin. . . . borealis. 
B’. Third and fourth segments of abdomen. without median spine on 
posterior margin. 
C. Rostrum unarmed on distal half of superior margin . goniurus. 
C’. Rostrum with spines on distal half of superior margin. jordani. 
A’, Third segment of abdomen not compressed and carinated, and with- 
out a median lobe or spine in front of posterior margin. 
B. Dorsal spines not reaching behind middle of carapace. 
C. Sixth abdominal segment more than twice as long as wide. 
D. Carapace and abdomen covered with short transverse rugose 
Imes... wo ue) ww) we a POD LOCEIAES: 
D’. Carapace and abdomen smooth - « « . montagui tridens. 
C’. Sixth abdominal segment less than twice as long as 
Wide ox: 4 - « « » platyceros. 
B’. Dorsal spines extending behind middle of carapace. 
C. Dorsal spines more than 15 (17-21). . . . . .« Aypsinotus. 
C’. Dorsal spines less than 15. 
D. Rostrum one and a half or more than one and a half times as 
long as carapace. a = SUrneyt. 
D’. Rostrum less than one and a 1 half times 4 as long as Carapace. 
E. Antennal scale very narrow, the terminal half of the blade 
narrower than the adjacent thickened portion stenolepis. 
E’, Antennal scale of moderate width, the terminal half of the 
blade not narrower than the adjacent thickened por- 
TOMEI Sine: < grea tha et are es ean bath gO AMES 
PANDALUS BOREALIS Kréyer. 
Pandalus borealis KROYER, Naturh. Tidsskrift, 11, 254, 1838; (2) 1, 461, 
1845 ; in Gaimard’s Voyage en Scandinavie, en Laponie, etc., pl. VI, fig. 2. 
STIMPSON, Jour. Boston Soc. Nat. Hist.,v1, 501 [61],1857; Ann. Lyc. Nat. 
Hist. N. Y., X, 128, 1871.—SMITH, Trans. Conn. Acad. Arts Sci., v, 86, 
1879. —BIRULA, Ann. Mus. Zool. Acad. Impér, Sci. St. Pétersbourg, 
1897, p. 420 [16]; 1899, pp. 22 [3], 28 [9]. 
