64 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 121 



wider than long (4.1 by 4.3 mm). Thoracic segments 2-4 free. No 

 dorsal plates present but lateral margins of segments 2 and 4 expanded 

 laterally somewhat. Genital segment 3.9 by 2.9 mm, widest at its 

 midpoint, its lateral margins somewhat irregular. Genital segment 

 with a median sinus posteriorly. Abdomen (fig. 326) 1-segmented. 

 Caudal rami (see fig. 326) round, bearing 3 weak spines as in figure. 



Oral area with adhesion pads associated with first and second 

 antennae and maxilliped. First antenna (figs. 327, 328) 2-segmented. 



Each segment armed as in figures. All spines and setae of first 

 antenna naked. Adhesion pad of first antenna produced to form 

 a sharp, posteriorly du'ected spine (see fig. 327). Second antenna 

 (fig. 329) of usual form with 2 short setae on distal claw. Mouth 

 tube and mandible as in other members of genus. First maxilla 

 (fig. 330) with a median short, stout spine and an anterior group of 

 3 short setae. Second maxUla (fig. 331) with a short terminal claw 

 bearing rows of fringe. The penidtimate segment with a stout 

 distal spine and a small patch of setae. Maxilliped (fig. 332) with a 

 stout terminal claw opposed by a raised area with a central depression 

 on penultimate segment. Maxilliped with an adhesion pad near base. 

 Pad produced in form of a sharp, posteriorly directed process (fig. 

 333) . This process seemingly subdivided. 



Legs 1-4 bu'amose with spine and setal formula as follows: 



Leg 1 (fig. 334) with both rami 2-segmented. Setae constricted 

 near their bases as in A'^. crypturus. First exopod segment with an 

 outer spine. Last exopod segment with 4 outer spines and 3 inner 

 setae. First endopod segment unarmed. Last endopod segment 

 with 3 terminal setae. Leg 2 (fig. 335) with both rami 2-segmented. 

 First exopod segment with an outer spine and an inner seta. Last 

 exopod segment Avith 4 outer spines and 5 inner setae. First endopod 

 segment with an inner seta. Last endopod segment with 7 terminal 

 setae. Leg 3 (fig. 336) with both rami 2-segmented. First exopod 

 segment with an outer spine and an inner seta. Last exopod segment 

 with 4 outer spines and 4 inner setae. First endopod segment with 

 an inner seta. Last endopod segment with 4 terminal setae. Leg 4 

 (fig. 337) with both rami 1-segmented. Exopod with 4 terminal 

 spines. Endopod unarmed. Leg 5 a single seta located on ventral 

 sm'face of genital segment near posterior corner (see fig. 326). 



Egg strings long and straight. 



Color in life cream. 



Male. — Body form as in figure 338. Total length 5.7 mm (based 



