418 PROCEEDINGS OF THE NATIONAL MUSEUM vol. lis 



forward-curving spines and several low ridges; second joint bearing 

 2 or 3 forward-pointing spines, one of which projects considerably 

 beyond third joint. Antenna 2 slightly longer than 1, fourth and 

 fifth joints about equal in length; flagellum composed of about 40 

 joints; peduncle without spines such as present on antenna 1. 



Upper lip broad, symmetrical, not incised. Mouth parts projecting 

 considerably downward, suggesting parasitic mode of life. Mandible 

 with forward part prolonged; cutting-edge rather narrow with blunt 

 teeth; accessory plate not close to cutting-edge; spine-row consisting 

 of close cluster of 4-5 short stout spines; molar strong, prominent, 

 situated at about middle of mandible, triturating surface narrow; palp 

 situated opposite molar, thu'd joint shorter than second. Maxilla 1, 

 inner plate with 2 apical setae clothed in minute setules, giving them 

 velvety appearance; outer plate with 11 simple spine-teeth; palp slen- 

 der, with 3 apical velvety spines. Maxilla 2, inner plate shorter, 

 broader than outer, both armed distally with velvety spines. Max- 

 niiped, inner plate broad, reaching to middle of outer plate, armed 

 distally and on inner margin with velvety spines; outer plate very 

 broad, reaching nearly to end of second joint of palp, armed distally 

 and on outer margin with short spines, and on inner margin with 

 short spines which appear to be imbedded in flesh; palp rather short, 

 slender, second joint longest, fourth joint short, stout, bearing minute 

 spinules. Lower lip without inner lobes; mandibular processes broad, 

 strong. 



Gnathopods much alike, subequal in size, rather short, slender; 

 second joint nearly as long as third to sixth joints combined; fifth 

 joint longer than sixth; sixth joint slightly expanded distally, with 

 lower distal corner slightly produced, thus forming slight chela with 

 stout seventh joint. 



Pereopods 1 and 2 alike in size and form, fifth and sixth joints 

 slightly expanding distally; seventh joint stout, strongly curved, very 

 sharp. Pereopods 3-5 increasing slightly in length consecutively; 

 second joint not much expanded, but that of fifth pereopod broadest; 

 fourth and fifth joints expanded distally with lower hind corner 

 considerably and sharply produced; sixth joint slightly expanded 

 distally; seventh joint stout, very sharp. 



Pleon segments rounding below, not produced backward. Uropod 

 1 reaching back slightly farther than 2 and uropod 3 slightly farther 

 than 1 ; outer rami of all uropods slightly shorter than inner. Uropod 

 3, rami somewhat expanded, with narrow pointed apices and many 

 very small marginal spinules. Telson reaching considerably beyond 

 peduncle of uropod 3, about as wide as long, slightly expanding dis- 

 tally, bearing shallow triangular excavation which separates 2 rounding 

 lobes bearing few minute spinules. All gills simple, without plaits or 



