NO. 1936. AMPIIIP0D8 FROM THE GULF OF MEXICO— PEAR^E. 375 



ment of peduncle one-third as long as second, second one-lialf third; 

 flagellum 5-segmented, longer than last two peduncular segments. 



Mandibles small, shorter than second segment of palp; cutting 

 edge double; molar tubercle prominent and narrow; palp reaching 

 to middle of third segment of second antenna, first segment small, 

 second and third subequal. 



Maxillipeds with inner plate reaching end of first segment of palp, 

 spinous at tip; outer plate narrower, reaching middle of second 

 segment of palp, with spines on inner margin longer and slenderer 

 toward tip; first and third segments of palp subequal, second twice 

 as long, fourth more than half as long as third, the apex rounded 

 and setose. 



First gnathopods with side plates small, front angle rounded; 

 basal segment slightly shorter than carpus, curved; carpus longer 

 than propodus; palm oblique, straight, poorly defined; dactyl three 

 times as long as propodus. 



Second gnathopods with side plates small, rounded; basal segment 

 equal to next three in length, twice as wide as merus; propodus one- 

 third longer than triangular carpus; palm transverse, defined by a 

 strong tooth inside which is a slight notch to receive the dactyl; 

 dactyl stout, curved. 



First and second peraeopods longer than second gnathopods; stout 

 side plates small and rounded, basal segment longer than next three, 

 with anterior margin convex in first and nearly straight in second; 

 merus nearly as long as combined ischium, carpus and propodus, 

 twice as wide as last two; dactylus half as long as propodus. Third 

 perseopod hardly reaching end of basal segment of second; basal seg- 

 ment about as wide as long, front margin straight; ischium a little 

 shorter than carpus; merus subequal to propodus; dactyl reversed, 

 wdth a secondary tooth. Fourth perssopod like third, but longer. 

 Fifth longer than fourth; the basal segment straight, twice as long 

 as wide, and with anterior distal angle forming a rounded right 

 angle; otherwise similar to fourth. Last peraeopod not reaching 

 beyond third pleon segment. 



First uropod with peduncle subequal to outer ramus, which is 

 one-fifth shorter than the inner, obliquely truncated at tip and 

 armed with a group of short, blunt spines; inner ramus styliform, 

 curved, spinulous on proximal half of outer margin. Second uropod 

 similar to first; outer ramus shorter than peduncle, which is subequal 

 to inner ramus; inner ramus not spinulous on margin. Third uropod 

 with peduncle shorter than either ramus; inner ramus longer than 

 outer; both rami rounded and setose on outer marghi at tips. 



Telson truncate at tip; mth two setffi at distal angles and four on 

 upper surface. 



Long-th, 6 mm. 



