68 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 27 



genus, Hirondellea fidenter resembles the type more than it does the 

 others. In its long and deeply cleft telson, it is especially similar to 

 Hirondellea trioculata Chevreux (see 1900), but it differs from that 

 species in the strongly overlapping dactyl of gnathopod 1 and the 

 broadly rounded posterior edge of the third pleonal epimeron. From 

 H. gigas (Birstein & Vinogradov 1955) it differs in the narrower, 

 more deeply cleft telson, the narrower rami of uropod 3 and the broadly 

 rounded posterior edge of the third pleonal epimeron. The genus 

 Hirondellea includes species having the inner ramus of uropod 2 con- 

 stricted or not constricted, the present species having that constriction. 



Genus Lepidepecreella Schellenberg 



Lepidepecreella Schellenberg 1926: 281. 



Including the one described here, six species are known for this 

 genus. With one or possibly two exceptions, their interspecific differ- 

 ences are rather minor, at best quantitative, and somewhat suggestive 

 of the situation in presumably pelagic and semiparasitic genera such as 

 Trischizostorna, reviewed by J. L. Barnard (1961b). Lepidepecreella 

 bidens (K. H. Barnard 1930) is that member most distinct from the 

 type-species, L. ctenophora Schellenberg (1926), differing from it by 

 the presence of a nasiform process on article 2 of pereopod 3. Lepidepe- 

 creella ovalis K. H. Barnard (1932) was stated to have its rostrum 

 extending as far as the epistomal process, hence differing from all 

 other species. The remaining species, L. emarginata Nicholls (1938), L. 

 cymba (Goes, see Stephensen 1931b), L. ctenophora, and the following 

 new species differ among themselves in minor characters as seen in the 

 following key. They may represent races or ecophenotypes of a poly- 

 morphic species. 



Key to Species of Lepidepecreella 



1. Article 2 of pereopod 3 with posterodistal nasiform 



process bidens 



1. Article 2 of pereopod 3 rectangular, linear 2 



2. Telson emarginate, articles 5 and 6 of gnathopod 1 



subequal emarginata 



2. Telson convex, article 6 of gnathopod 1 longer than 



article 5 3 



3. Rostrum extending to apex of epistomal process, third 

 pleonal epimeron with distinct posteroventral 



tooth ovalis 



