lO 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 9I 



margin of the carapace (text fig. 5^) with a median triangular lobe 

 and a broad rectangular lobe on each side of it, none of the lobes 

 reflexed. 



Fig. 5. — Gastrosaccns jahnsoni, n. sp. a, dorsal view of the anterior end to 

 show the rostral plate, eyes, antennular peduncle and the antennal scale ; b, outline 

 of the posterior margin of the carapace. All X 50. 



Eyes small, including the eyestalks twice as long as broad, cornea 

 occupying the distal third of the whole eye and wider than long. 



Antennular peduncle (text fig. 5a) with the first joint equal to the 

 combined length of the second and third ; two spines on the outer 

 margin of the second joint and a similar spine near the distal end of 

 the outer margin of the third joint. 



