210 U.S. NATIONAL MUSEUM BULLETIN 258 



Podocerus cristatus (Thomson) 



Podocerus cristatus (Thompson) : J. L. Barnard, 1962a, pp. 67-69, figs. 31, 32 

 (with references); 1964a, p. 246. 



Material. — cayucos: Phyllosjiadix-pelvetud grid, scarce (17 per 

 sq. m.); sponge, rare. 



Distribution. — Probably ubiquitous in tropical and warm tem- 

 perate seas of the Indo-Pacific region, northern record in eastern 

 Pacific Ocean here at Cayucos, California; occurring in depths of 

 0-170 m. in southern California. 



Stenothoidae 



Metopa cistella, new species 



Figures 59, 60 



Diagnosis.- — Eyes large; lateral cephalic lobe broad, well-projecting, 

 pectoriform; epistomal keel rather short, broad, tapering subacutely, 

 far exceeding small mamilliform projection of upper lip; antennae of 

 medium length for the genus, equal, peduncular articles of antenna 



1 successively shorter, peduncle of antenna 2 relatively stout; body 

 dorsally smooth, lacking ridges or keels; coxa 4 very elongated for the 

 genus; mandibular palp 3-articulate, article 3 vestigial; inner plates 

 of maxilliped fused together, with scarcely any terminal separation, 

 each lobe with secondary contiguous lobe on inner face; articles 5 

 and 6 of gnathopod 1 equal in length, slender, article 5 lacking pos- 

 terior lobe, article 6 tapering, lacking palm, posterior edge with 

 about 5 long setae, dactyl about one third as long as article 6, inner 

 margin setose, neither articles 5-6 extremely elongated and both of 

 about equal width; male gnathopod 2 of medium expansion, palm 

 oblique, slightly shorter than posterior margin of article 6, palm 

 defined by one small cusp and bearing one similar middle cusp and 



2 small ones near dactylar hinge; female gnathopod 2 with slightly 

 simpler palmar ornamentation (see figure) ; pereopodal dactyls about 

 half as long as sixth articles, smooth except for minute distal setule; 

 article 2 of pereopod 4 of medium expansion for the genus, of pereopod 

 5 fully expanded, fourth articles of pereopods 4-5 scarcely expanded and 

 with short posterodistal lobes not reaching halfway along fifth articles; 

 uropod 3 with ramus slightly shorter than peduncle, its 2 articles 

 equal in length; telson with 2 lateral spines on each side. 



Holotype— AHF No. 6128, male, 2.3 mm. 



Type locality. — Station 42, Hazard Canyon reef, California, 

 December 8-9, 1961, diving sample 4, algae below water. 



Relationship. — Many species of Metopa would resemble this 

 species if male gnathopods, which may not be mature, are disregarded. 



