AMPITHOIDAE FROM SOUTHERN CALIFORNIA — BARNARD 29 



1 shorter than article 6, posterior edge of article 5 with a shallow, 

 broad hind lobe, palm obhque; articles 2-5 strongly setose; male 

 gnathopod 2 with palm quite oblique, excavated to form a short 

 thumb at defining corner which increases in extension with the elonga- 

 tion and further disproportion of the palm, a small process near the 

 finger hinge increasing in development also; dactylus fitting palm in 

 young males, failing to fit palm in old males; article 2 of pereopods 1-2 



Figure 18. — Ampithoe simulans Alderman, aberrant specimens similar to A. pollex in 

 second gnathopodal morphology: a, male, 8.0 mm., Barnard sta. 40-A; h, male, 9.0 mm., 

 Barnard sta. 40-A. 



about 2.5 times as long as broad; ventral edge of antenna 1, article 1 

 not spiniferous; antenna 2 longer than antenna 1, flagellum of antenna 

 1 longer than that of antenna 2, flagella both poorly setose; outer 

 apical lobule of lower lip slightly longer than inner lobule, the two 

 small apical spines on sixth articles of the pereopods are fluted (see 

 figures); coxae 1 and 2 scarcely half as long as coxae 3-5; peduncular 

 process of uropod 1 vestigial. 



Female: Article 5 of gnathopod 1 shorter than article 6, the append- 

 age not as setose as on male; article 5 of gnathopod 2 like that of male 

 gnathopod 2, much shorter than on gnathopod 1, with a narrow 

 hind lobe. 



