!9 21 ] Schmitt: The Marine Decapod Crustacea, of California 41 



1. Bostrum 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. Bostrum 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. Bostrum 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. Bostrum 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. Bostrum 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 Kathtmn 



Flate 14, figure 1 



Fandalus jordani Eathbun, Proc. U. S. Nat. Mus., 24, 900, 1902 ; H. A. E., 

 10, 40, pi. 2, fig. 3, 1904. 



Characters. — Surface smooth and shining. Bostrum 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, extending 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 



