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SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 9I 



Telson (text fig. ya), including terminal spines, slightly shorter 

 than the inner uropod, two and one-half times as long as broad at 

 the base, cleft of the usual type and with the usual armature, lateral 

 margin with nine spines extending throughout their entire length, 

 the distal pair of spines on each margin much larger than the rest. 



Fig. 7. — Gastrosacciis johnsoni, n. sp. a, telson; b, uropods. All X ^^\- 



about three times as long as the antepenultimate spines, subequal in 

 length and placed close together. 



Male pleopods very distinctive, especially those of the second and 

 third pairs; the endopod of all the male pleopods is composed of a 

 single short joint; in the first pair of male pleopods (text fig. 6a) 

 the exopod is much longer than the endopod and is divided into four 

 joints; in the second pair (text fig. 66), the pleopod is very long and 

 stout, one and one-half times as long as the exopod, the endopod 



