GAMMARIDEAN AMPHIPODA 27 



Photis (Cedrophotis) tnalinalco, new species 



Figures 11, 12 



Diagnosis. — With the characters of the subgenus. 



Description. — Eyes absent (figure of head showing brain and not 

 an eye) ; lateral ceplialic lobe subacute, gland-cone of antenna 2 blunt; 

 first antennal peduncle slightly longer than flagellum, article 2 longer 

 than 1 or 3, accessory flagellum a small, rounded scale; antenna 2 

 shorter than antenna 1; mouthparts generally typical of Photis as 

 represented by P. i^einhardl in Sars (1895, pi. 202) except for sub- 

 generic distmctions noted in upper and lower lips ; inner lobe of maxilla 



Figure 11. — Photis {Cedrophotis) malinalco, new species, holotype, juvenile, 2.2 mm, 7231: 

 a, left mandible, outer surface, with molar on far side; b, right mandibular molar; c, 

 labrum; d, lower hp; ej, maxillae 1,2; g, maxilliped; h-j, uropods, 1,2,3. 



2 poorly setose ; outer plate of maxilliped with medial margin slightly 

 invaginate and armed with 2 large blades medially and 3 long spines 

 distally; gnathopods weak, slender, scarcely subchelate, gnathopod 1 

 with articles 5 and 6 subequal in length, palmar extent of article 6 

 defined by setae but dactyl extending for nearly full length of posterior 

 margin, posterior edge of article 5 not lobate ; gnathopod 2 with sixth 

 article longer than unlobate fifth, dactyl extending only to setiferous 

 definition of palm, dactyl with inner articulated spine ; pereopods 1 and 

 2 very slender; pereopods 3 and 5 (4 missing) slender, unusually elon- 

 gate, dactyl of pereopod 5 also unusually elongate; uropods 1 and 2 

 lacking peduncular processes; telsons of both specimens damaged and 

 not clearly observed. 



242-332— G7 3 



