a SS ee ee 
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1921] Schmitt: The Marine Decapod Crustacea of California 41 
1. Rostrum with spines on distal half of superior margin, about one 
and three-fourths times as long as carapace, armed above with 
fourteen to seventeen spines, including four on the carapace, all 
movable except distal three; below with seven to ten immovable 
spines. 
jordani, p. 41. 
2. Rostrum unarmed on distal half of superior margin, slender, about 
one and one-half to one and four-fifths as long as carapace, 
armed above with ten to twelve movable spines, of which three 
to five are on the carapace, the remainder confined to the basal 
half of the rostrum (posterior spine just in front of middle 
of carapace) below with six to seven immovable spines. 
montagui tridens, p. 42. 
B. Sixth segment of abdomen short and stout, about one and one-half times 
as long as wide. Carapace pubescent. Rostrum one and one-half 
to one and two-thirds times the carapace. Median crest arising half 
way back on the carapace, armed with fourteen to seventeen spines, 
extending to middle of rostrum, all movable except one to five 
anterior ones; usually a solitary spine not far behind acute tip; 
seven to eight fixed spines below. 
platyceros, p. 43. 
II. Dorsal spines extending behind middle of carapace; tip of rostrum trifid. 
A. Rostrum one and one-half times as long as carapace or more. Median 
dorsal spines eight to nine, all movable, rather distant; ventral spines 
nine to ten, immovable. Sixth segment of abdomen about one and 
one-half times as long as wide. (Not known north of Monterey 
Bay, or south of Santa Catalina Island.) 
gurneyi, p. 46. 
B. Rostrum less than one and one-half times as long as carapace. Median 
dorsal spines ten to twelve, movable; about half of them on the 
carapace, the posterior spine a little behind the middle; terminal half 
of rostrum, unarmed above; lower margin six to eight spines. Sixth 
segment of abdomen one and two-thirds as long as wide. (Not 
known south of San Francisco.) 
danae, p. 44. 
Pandalus jordani Rathbun 
Plate 14, figure 1 
Pandalus jordani Rathbun, Proc. U. 8. Nat. Mus., 24, 900, 1902; H. A. E., 
10, 40, pl. 2, fig. 3, 1904. 
Characters.—Surface smooth and shining. Rostrum about one and three- 
fourths times as long as carapace, slightly arched above the eyes, terminal two- 
thirds ascending; slender; armed with fourteen to seventeen spines above, 
including four on the carapace, distal three immovable, others movable, closer 
together above the eye; seven to ten immovable spines below, exteuding nearer 
to tip than superior spines; tip acuminate; the posterior of the dorsal spines lies 
between the middle and the anterior third of the carapace. Antennal scale 
three-fourths to four-fifths as long as carapace, extremity of blade broadly 
