148 U.S. NATIONAL MUSEUM BULLETIN 2 60 



Stegocephaloides Sars 



Stegocephaloides camoti, new species 



TlGURE 73 



Diagnosis. — Lateral cephalic lobes slightly produced, mammilli- 

 form, obtuse; eyes absent; first flagellar article of antenna 1 flattened 

 and inflated (from lateral view) ; apices of lower lip with raggedly di- 

 gitate processes ; palp of maxilla 1 not reacliing base of lateral spines on 

 outer plate ; inner plate of maxilliped short, broad, distally concave, 

 just reaching basal joint of palp article 2; article 2 of pereopod 4 

 unexpanded, very slender; anterior margin of article 2 on pereopod 

 5 short for genus, remaining articles together longer than that margin, 

 posterior lobe of article 2 reaching proximal joint of article 5, broad, 

 distally rounded, posterior edge with 4 quadrate serrations; pleonal 

 epimeron 1 with rounded posteroventral corner, epimeron 2 with quad- 

 rate corner, 3 with projecting, slightly retrorse tooth; outer ramus 

 of uropod 1 shorter than inner, curved, unarmed; rami of uropod 2 

 equal to each other, outer with one small spine ; peduncle of uropod 3 

 slightly expanded, poorly lamelliform, rami trihedral, outer biarti- 

 culate, inner slightly shorter than outer, both rami relatively short 

 and broad for stegocephalids; telson cleft little more than one third 

 of its length. 



HoLOTYPE. — AHF No. 6136, ?male, 1.8 mm. Unique. 



Type-locality.— Station 7234, 27°38'00" N, 115°16'16'' W, 791- 

 842 m, Jan. 2, 1961. 



Relationship.— This species has its closest affinities with the Ant- 

 arctic Stegocephaloides vanhoffenl Schellenberg (1926a). Perhaps 

 both species should be removed to a new genus. The mouthparts of 

 the north Atlantic Stegocephaloides christianiensis (Boeck), the type- 

 species, have never been figured but are said to resemble those of 

 Stegocephahis Kr0yer, If so, the new species and S. vanhojfeni ditfer 

 from the type by the ( ?very short) distally excavate inner plate of 

 the maxilliped (a character used to distinguish Andaniopsis Sars and 

 Andaniella Sars) ; Stegocephaloides camoti also is distinguished by 

 the complex digitation of the lower lip but this character is unknown 

 for S. vanhoffeni. Stegocephaloides camoti and S. vanhoffeni differ 

 from each other by the shape and ornamentation of pleonal epimeron 

 3, that of S. vanhoffeni having a blunt posteroventral projection, the 

 posterior edge of which is armed with four strong teeth. 



Stegocephaloides katalia J. L. Barnard (1962a) differs from S. 

 camoti by the absence of a distinct tooth on the third pleonal epimeron 

 and the broader second article of pereopod 4, the shorter posteroventral 



