80 U.S. NATIONAL MUSEUM BULLETIN 258 



similar to P. rickettsi Shoemaker (1931); maxilla 1 with uniarticulate 

 palp, apex of palp not reaching proximal spine of outer plate; pos- 

 terior edge of coxa 5 not cuspidate, coxa 6 with very sharply quadrate 

 posterior corner, coxa 5 with slight posterior cusp; proximal cusp 

 on article 2 of pereopod 3 poorly developed, pereopod 4 with both 

 one proximal and one distal posterior cusp of poor development; 

 pereopod 5 with one moderately developed, posterodistal cusp on 

 article 2; posterior processes of fourth articles of pereopods 3-5 

 reaching along fifth articles more than in P. rickettsi; apices of 

 telsonic lobes bispinulate, medial projections very blunt and extending 

 farther than lateral projections; article 2 of pereopod 3 poorly ser- 

 rate, of pereopods 4-5 well serrate; distal ends of coxae 1-4 not 

 extremely acute. 



Holotype. — AHF No. 4115, female, 5.5 mm. 



Type locality. — Velero Station 1407, Long Point to Willow 

 Cove, Catalina Island, California, September 14, 1941, 33-24-00° N, 

 118-21-30° W, dredge at 30-45 fath. (55-82 m.), sand, algae. 



Relationship. — This species fits P. minuta (Sars, 1895, pi. 133, 

 fig. 1) in Hurley's (1954b) key but has more aspects of P. rickettsi 

 Shoemaker (1931) than it does of P. minuta. Its posteromedial 

 teeth of the first and second pleonal epimera are nearly obsolete 

 (in P. minuta they are absent, in P. rickettsi they are strongly de- 

 veloped), the teeth of coxae 3-5 are not as fully developed as are 

 those of P. rickettsi (absent in P. minuta) and the second articles 

 of pereopods 3-5 are clearly similar to but not as fully developed 

 as those of P. rickettsi. The first four coxae of P. minuta are very 

 acute distally but in the present species and P. rickettsi they are 

 blunter. The posteroventral corners of pereonites 6-7 are strongly 

 produced in P. rickettsi, slightly less so in P. hedgpethi, and not 

 produced in P. ndnuta. 



The major feature of qualitative value is the uniarticulate first 

 maxillary palp; it is biarticulate in both P. rickettsi and P. minuta 

 and all other species of the genus Panoploea. The new species appears 

 to be a derivative of P. rickettsi which has lost a palp article through 

 fusion and has a reduction in ornamentation. It is not a stray aberra- 

 tion because several specimens are available from different localities. 



Material. — Velero Stations 1407 (4), 1449 (4). Barnard Station 

 41 (1). 



Records.- — Goleta, 3 m., in Macrocystis-holdiast, rare; Catalina 

 Island, 30-45 fath. ; Newport Bay, California, harbor piling. 



