2 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 78 



the side-j)lates. Upper lip about as broad as long, converging toward 

 the rounding and slightly emarginate apex. Mandible very long 

 and slender, but widening abruptly at the base, apex slightly curved, 

 pointed and bearing a few low teeth on lateral margin, accessory plate 

 originating about half wa_y between molar and apex, very long and 

 slender, and surmounted by a single setule, molar situated about 

 one-third the distance from the base and not very strong, palp 

 situated back of the molar very near the base, and when extended 

 reaching very little beyond the apex of the mandible. Maxilla 1, 

 inner plate bearing four plumose setae, outer plate very long and 

 narrow, and bearing 10 serrate spine-teeth on the very oblique upper 

 margin, palp slender, second joint about one-third longer than first 

 and bearing four or five slender spines on apex. Maxilla 2, inner 

 plate shorter and broader than outer, the very oblique extremity 

 bearing many jDlumose spines, and the outer plate bearing many long 

 curved distal spines. Maxillipeds, inner and outer plates long and 

 slender, outer plates becoming narrower toward the apex, palp with 

 first joint set at right angle to the plates, and the second and third 

 joints parallel with them, second joint with inner margin produced 

 distally into a broad lobe, second and third joints armed distally 

 with many long spines. Lower lip, outer lobes incised on inner 

 margins near apex, inner lobes wanting, lateral processes long and 

 prominent. Side-plate 1 more rounding distally than 2 or 3, and 

 side-plates 1 to 4 each bearing a few serrations on inner margin near 

 apex. Gnathopods 1 and 2 chelate. Gnathopod 1 very slender and 

 a little longer than 2, fifth joint slightly longer than sixth, seventh 

 joint closing against and exactly fitting palm, end of sixth and 

 seventh joints slightly unguiform. Gnathopod 2 slender but stouter 

 than 1, fifth joint very slightly shorter than sixth, seventh joint 

 closing against and exactly fitting palm which is armed throughout 

 with a row of forward pointing bristles. Side-plates 5 to 7 produced 

 posteriorly to a sharp point. Peraeopods 3 to 5 rather robust and 

 increasing slightly in length consecutively. Peraeopod 3, second 

 joint with lower posterior corner broadly rounding, and upper 

 posterior corner produced to a sharp point, fourth joint with lower 

 posterior corner produced to about the middle of fifth joint. 

 Peraeopod 4, second joint with lower posterior corner produced to a 

 sharp point, and upper posterior corner but slightly produced, rest of 

 limb as in peraeopod 3. Peraeopod 5, second joint with lower posterior 

 corner produced to a sharp point and upper posterior corner broadly 

 rounding, rest of limb as in peraeopods 3 and 4. Peraeon segment 7 

 and pleon segments 1 to 3 each produced dorsally into two backward 

 projecting teeth. The lower posterior corner of peraeon segment 7 

 and the upper lateral corner of pleon segments 1 and 2 produced to 

 isharp points. Pleon segment 3 with the upper and lower lateral 



