MARINE AMPHIPODA IN MICRONESIA — BARNARD 537 



species, which may indicate that the specimens are very large females 

 of M. abbotti, but the shape of the lateral lobes on the head and the 

 bleached condition of the eyes and head mark these specimens strongly 

 from M. abbotti. Only one bleached male of M. abbotti has been 

 discovered. The first point of difficulty is that the present specimens 

 of E. pacificus have 3-4 large spines on the posterior edge of article 6 

 on pereopod 3 just as in M. abbotti; this has never been indicated for 

 E. atlanticus or E. pacijicus but has been shown for E. afer (Stebbing, 

 1888, pi. 114). 



The second point of diSiculty is that Schellenberg (1938a) has 

 described E. pacificus as having eyes and lateral head lobes resembling 

 E. atlanticus by Stebbing (1888). The lateral lobes of the present 

 specimens are not as produced as in E. atlanticus (compare figm-es 

 herein, Stebbing 1888, Walker 1905 of E. gardineri, and Pillai 1957). 

 Yet they are not quite as short as in E. afer (Stebbing 1888, and J. L. 

 Barnard 1961) but are more like those of E. afer as figured by Pillai 

 (1957). Most certainly the specimens at hand are distinct from the 

 E. atlanticus cited herein and are distinct from Stebbing's and J. L. 

 Barnard's portrayals of E. afer. They cannot be firmly set as E. 

 pacijicus, since males are not present; the second gnathopods are like 

 those of the female of E. pacijicus as dl'a^vn by Schellenberg (1938a) 

 with one exception : an animal from 72-G-3 has the second gnathopod 

 approaching that of E. atlanticus as figm*ed by Schellenberg, wherein 

 a distinctly defined palm is shown. 



See the remarks on this problem m the introduction to this genus. 



Distribution: EUice, Gilbert, and Marshall Islands; Nauru; Ifaluk 

 Atoll, Caroline Islands. 



Genus Megamphopus Norman 

 Megamphopus abbotti, new species 



Figure 32 



Diagnosis: Lateral lobes of head not pedunculate, projecting coni- 

 caUy forward, eyes dark, sublageniform ; accessory flagellum 2-articu- 

 late; palm of gnathopod 2 transverse, with a small excavation and large 

 spine near the defining angle of the palm, article 7 stout, apically 

 incised; uropod 1 with a long peduncular tooth as long as the outer 

 ramus, uropod 2 lacking tooth; telson rounded apicaUy, with 2 false 

 dorsal lobes, each armed with a spine and a seta. 



Female: Gnathopod 2 with slightly obHque palm cut into minute 

 subcastellations, with a tooth and a large spine at lower corner. 



The head and body are moderately stained with diffuse pigment, 

 especially around the dark eyes. 



Holotype: USNM 105872, male, 2.75 mm. 



Type locaUty: Abbott station 166-G-3, Ifaluk Atoll, Oct. 25, 1953. 



