546 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 112 



noted that further examination of the material should be made when 

 Fage's description became available. 



Critical examination proves that all the specimens in the collections 

 of the U.S. National Museum from Hawaiian waters, with the excep- 

 tion of the adult 9 from station 3965, can without question be referred 

 to hawaiensis. In every case the form of the antennular lamina and 

 antennal scale, the shape and size of the alar spines, the almost 

 complete absence of tergal processes from the last abdominal somite, 

 and the armature of the telson are most consistent. 



The specimen from station 3965, however, differs from hawaiensis 

 as follows: 



The rostrum is relatively much longer, the alar spines are very 

 considerably longer, and the tergal spines (which are practically 

 obsolete in hawaiensis) are well developed, though small. 



The anterior margin of the antennular lamina has a tooth on its 

 inner angle, separated by a small concavity from a rounded apex 

 adorned with spinules, whereas in hawaiensis this margin is deeply 

 concave and unadorned with spinules. 



The antennal scale is longer and more slender and its outer margin 

 is straight. 



The telson is armed with three small spines on each side and a very 

 short subapical spine, while in hawaiensis there is only one lateral 

 spine in addition to the subapical one. 



I am therefore unable to place this specimen into any of the known 

 species and consider that in all probability it represents a new form, 

 but since the genus exhibits so much individual variation, it would 

 be unwise to found a new species on a single imperfect individual. 



