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PROCEEDINGS OF THE NATIONAL MUSEUM vol. iig 



Figure 12. — Ampithoe plumulosa Shoemaker, male, 13 mm., Bahia de San Quintin: a, 

 lower lip; b-e, uropods 1, 2, 3, 3;/, telson; female, 12 mm.: g-i, gnathopods 1, 2, 2, 



Ampithoe pollex Kunkel 



Figures 13-14 



Amphithoe [sic] pollex Kunkel, 1910, pp. 92-94, fig. 36. 



Ampithoe pollex. — J. L. Barnard, 1954, pp. 29-31, pis. 27-28; 1959, p. 37. 



Grubia indentata Stout, 1913, pp. 656-657. 



Diagnosis of male: Second and third pleonal epimera rounded on 

 posteroventral corners, no lateral ridges; article 5 of gnathopod 1 

 shorter than article 6, posterior edge of article 5 with a rounded hind 

 lobe, palm oblique; gnathopod 2 with oblique palm developing a 

 progressively larger detached hind tooth that grows distalward until 

 it overextends a transverse palmar line; a small process overrides the 

 hinge area but is not a part of the palm ; finger fitting palm in young, 

 increasingly overlapping the large palmar tooth in old age; second 

 articles of both gnathopods with anterodistal lobes, not strongly 

 prominent in gnathopod 2; article 5 of gnathopod 2 with a slender, 

 subobtuse hind lobe; article 2 of pereopods 1-2 about 3.2 times as 

 long as broad; ventral edge of article 1 of antenna 1 not spiniferous; 

 antenna 2 slightly longer than antenna 1, flagellum of antenna 1 



