46 RATHBUN 



PANDALUS HYPSINOTUS Brandt. 

 Plate ii, fig. 5. 



Pandalushypsinotus'R'B.A.'S'D'T, in Middendorff's Reise in den aussersten Norden 

 und Osten Sibiriens, II, Zool., I, 125, 1851. Unalaska. 



Body stout. Rostrum a little (one sixth or one seventh) longer than 

 the carapace, which is strongly arched dorsally. The median crest 

 reaches nearly to the posterior margin ; the superior median spines are 

 movable, occupy the anterior three fifths of the carapace, and extend an 

 equal distance on the rostrum, in all numbering 17 to 22. The distal 

 portion is strongly ascending and unarmed, except at the tip, which is 

 oblique and armed with three immovable spines; the lower margin is 

 furnished with 7 to 9 fixed spines, the posterior ones very large and 

 hooked; lateral carinse of moderate prominence. Antennal spine of 

 moderate size, acuminate ; pterygostomian spine small. 



Eyes pyriform, nearly as broad as long; cornea in alcohol bluish; 

 ocellus darker. 



Antennular peduncle reaching not quite to the middle of the acicle ; 

 second joint a little longer than the third. Outer flagellum two thirds as 

 long as carapace, the posterior five sixths thickened; inner flagellum 

 about one fourth longer than outer ; basal scale lobiform, not reaching 

 end of eye. 



Antennal scale about four fifths as long as carapace, oblong, extremity 

 obliquely subtruncate, spine very slightly longer. Peduncle reaching to 

 end of second segment of antennular peduncle ; flagellum nearly as long 

 as the body. 



Maxillipeds in large specimens reaching a little in advance of the acicle ; 

 first pair of feet nearly to end of acicle. Right leg of second pair reach- 

 ing about to the end of the rostrum, carpus with 19 or 20 segments, the 

 first and last of which are about equal to the three adjoining segments ; 

 propodus as long as the last four segments of the carpus, fingers two 

 thirds the length of palm. Left leg of second pair half again as long as 

 right ; carpus composed of about 60 segments, the first and last subequal 

 to the three adjoining segments; propodus a little longer than the last 

 three segments of the carpus ; fingers nearly as long as palm. The merus 

 and the ischium of the second pair are also more or less segmented. The 

 third pair of legs extends beyond the acicle by the length of the dacty- 

 lus and half or more of the propodus ; the fifth pair reaches beyond the 

 middle of the acicle. Dactyli of last three pairs, in the female, contained 

 from two and one fourth to four times in their propodi. In the male the 

 propodi of the third and fourth pairs are a little shorter, are recurved (in 

 the third pair strongly so), and are narrowed at the extremity. 



