4O RATHBUN 



PANDALUS JORDANI Rathbun. 

 Plate n, fig. 3. 



Panda/us jerdaniRATHBUN, Proc. U. S. Nat. Mus., XXIV, 900, 1902. 



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 14 to 17 spines above, includ- 

 ing 4 on the carapace ; distal three immovable, others movable ; closer to- 

 gether above the eye ; 7 to i o 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 spine strong; pterygostomian small, slender. Eyes large, 

 pyriform. 



Peduncle of antennulae reaching to middle of antennal scale ; second 

 and third joints subequal ; flagella subequal, one and a half times as long 

 as carapace, thickened portion of outer flagellum extending half its length 

 beyond the antennal scale. Scale three fourths to four fifths as long as 

 carapace, extremity of blade broadly rounded, and equally produced with 

 the spine ; antennal peduncle reaching to end of second segment of an- 

 tennular peduncle ; flagellum one fourth longer than body. 



Outer maxillipeds slender, not reaching end of acicle. First pair of 

 feet a little shorter; of the second pair, the right foot extends about to 

 end of scale, the left may be half again as long; the right carpus has 19 

 to 22 segments, the left 58 to 63 segments. The last three pairs of feet 

 diminish a little in length successively, the third pair exceeding the scale 

 slightly; their dactyli are elongate, and are contained from two and a 

 half to two and four fifths times in their propodi. 



The third segment of the abdomen is compressed and its posterior 

 half carinated, the carina interrupted by a slight lobe at the posterior third 

 of the segment ; this lobe is of varying size, at no time strong, and hav- 

 ing a tendency to disappear in large specimens, where it may occur only 

 as a slight unevenness in the curve seen in profile ; posterior margin well 

 produced backward, rounded, unarmed; fourth segment with posterior 

 margin truncate, entire; sixth about twice as long as fifth and three 

 fourths as long as seventh, which has 10 to 13 lateral aculei on each 

 side. 



' Females bearing eggs taken in January and February off southern 

 California. 



Dimensions. Ovigerous female, length 124.5 nun., length of cara- 

 pace and rostrum 59.5 mm., of rostrum 38 mm. 



