No. 1594. FOUR NEW AMPHIPODOUS CRUSTACEA—PEARSE. 29 
rami both one-segmented. Telson twice as broad as long, cleft shal- 
low, distal row of long spines and two dorsal lateral spines. 
Length, 8.2 mm. 
A single specimen collected by L. R. Cary at Cameron, Louisiana. 
Type.—Cat. No, 38840, U.S.N.M. 
Wy Up VAL 
a= 
— 
= 
UIESSs 
Fig. 2.—HAUSTORIUS AMERICANUS. 4), FIRST ANTENNA; Gj, SECOND ANTENNA; 9}, FIRST GNATHOPOD; 
g2, SECOND GNATHOPOD; m, MANDIBLE; p;, FIRST PERHOPOD; ps, SECOND PERHOPOD; p3, THIRD 
PEREOPOD; p4, FOURTH PERHOPOD; t, TELSON; U,, FIRST UROPOD; U3, THIRD UROPOD. 
MARA RATHBUNZ, new species. 
Body slender, smooth. Head, lateral lobes rounded. First side 
plate produced anteriorly into an acute process; third rounded; sec- 
ond and fourth truncate. Third pleonic segment, postero-lateral 
corners slightly produced, hind margin shghtly crenate. Eyes narrow 
elliptical. First antenna, second joint of peduncle a little longer 
than first; third short, flagellum as long as peduncle, 27-jointed, 
accessory flagellum 10-jointed. Second antenna, peduncle slightly 
shorter than that of first antenna, flagellum subequal to ultimate joint 
of peduncle. Second gnathopod, fifth joint longer than sixth, palm 
straight, oblique, hind margin convex, setose. Second gnathopod, 
much larger, fourth joint produced into an acute process, fifth more 
than twice as wide as long, palm with a tooth at its outer angle and a 
