262 BIOLOGICAL SURVEY OF 



111 this place I wish to express my particular gratitude to 

 Mr. S. N. F. Saiiford, of the Boston Society of Natural His- 

 tory, for his kindness in facilitating my study of certain deca- 

 pods in the Museum which had been determined by Miss 

 Rathbun. 



Suborder NATANTIA 

 Tribe CARIDEA 



Pandalidae 

 Pandalus Leach 



P. MONTAGui Leach. (Rathbun, 1929, p. 8, fig. 5.) On rock 

 bottoms, depth 30 to 101 feet, not common. Stations : D 3, 5, 

 20, 35, 39, 40, 41, 68, 69, 71, 77, 94, 103, 117. 



Hippolytidae 



Spirontocaris Bate (Hippolyte) 



Miss Rathbun 's (1904) paper on Pacific decapods is particu- 

 larly valuable for this genus. The first of the following keys 

 is based on her key. The second key, based largely on the 

 characters of the rostrum, applies to the species as they occur 

 in this region. 



1 One or more supraorbital spines 2 



No supraorbital spines 5 



2 First to third abdominal segments laterally | ' ' 



spinous groenlandica 



These segments laterally rounded 3 



3 Two supraorbital spines spina 



One supraorbital spine 4 



4 Rostrum barely longer than eye zebra 



Rostrum more than twice as long as eye .... polaris 



5 Rostrum at least as long as the rest of the 



carapace fabricii 



Rostrum much shorter than rest of carapace, pusiola 



