206 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 5 



margin of the carapace ; either side of this spine on the posterior margin 

 are 2 spines followed by a movable submedian spine, I take it to be ; this is 

 nearly twice as large as any of the other spines on the telson ; beyond the 

 submedians in turn are 4 simple spines, each, as one goes away from the 

 median line, slightly shorter than its predecessor ; the next in order is the 

 5th spine which is twinned on either side, and between each of the 

 twinned spines and the simple spine outside it there is a gap in the margi- 

 nal series occupied by a small depression, continued on to the ventral sur- 

 face of the telson as a shallow furrow. Beyond the depression along the 

 margin of the telson are 3 spines in a row, following which the margin of 

 the telson turns forward; around this bend the margin is unarmed, and a 

 bit thickened or carinated; paralleling this "carina" and a bit inside it is a 

 row of 4 spines ; next there is another unarmed emargination of the border 

 of the telson a little before the anterolateral angle of the telson ; this angle 

 is spine tipped, and just posterior to this spine at the angle is a similar one 

 on the anterior slope of the emargination just referred to, but well back 

 from the margin of the telson at this point. 



The ventral surface of the telson is symmetrically grooved ; there is a 

 row of spines on the ventral surface at a little distance from the margin of 

 the telson and some additional scattered spines along the sides of the ven- 

 tral grooves or furrows ; the ventral surface otherwise is somewhat regu- 

 larly lumpy. 



A pair of slender spines form the ventral process of the uropods ; the 

 outer is about one half as long as the inner and close to it, leaving a very 

 narrow, more or less parallel-sided sinus between the 2 spines. 



I observe some differences between the specimens before me and the 

 one figured by Dr. Gravier. The eyestalks of the specimen in his figure 

 extend a shorter distance beyond the distal margin of the rostral plate and 

 appear medially longitudinally grooved; the telson, as depicted by Gra- 

 vier, seems to have a median dorsal groove or, at least, interspace between 

 the row of spines either side of the median line, instead of a median row of 

 spines as in our specimens, ''^^ while the difference in relative length of the 

 spines of the ventral process of the uropods does not appear as great nor 

 the sinus between them as parallel sided as in our Pacific material. Never- 



"^1 A re-examination of the type by Dr. Marc Andre during a recent absence of 

 Professor Fage from the Paris Museum reveals that this groove shown in the figure 

 does not exist in fact in the type specimen ; also the basal joint of the uropod is 

 spined in the type, as in the Galapagos specimens, and not unarmed, as depicted by 

 Gravier. 



