A New Species of Amphipod from Lower California 
(Genus Eriopisay 
J. Laurens Barnard^ 
Among recent collections of amphipods 
made by Dr. John S. Garth along the coast 
of Lower California, from the research vessel 
”Velero IV,” were those reported upon here, a 
new species belonging to the genus Eriopisa 
Stebbing (1890: 193). I am pleased to name 
this amphipod for Dr. Garth, in whose lab- 
oratory the work was carried out, and whose 
counsel for several years has been greatly 
appreciated. I am also indebted to Captain 
Allan Hancock, Director, and Dr. James W. 
Buchanan, Director of Research, Allan Han- 
cock Foundation, for support and equipment. 
Eriopisa garthi new species 
Figs. 1, 2 
DESCRIPTION OF MALE.— Head nearly as 
long as first 2 body segments, lateral lobes 
strongly produced, obtuse. Eyes not visible. 
Antenna 1 about as long as head and 
peraeon combined, articles 1 and 2 of pedun- 
cle subequal in length, article 3 about half 
as long as article 2. Flagellum slender, 1.5 
times as long as peduncle, with as many as 
16 articles. Accessory flagellum with 2 arti- 
cles, longer than first article of primary 
flagellum. 
Antenna 2 reaching slightly beyond end of 
peduncle of antenna 1, articles 4 and 5 equal 
in length, flagellum slightly longer than arti- 
cle 5 of peduncle. 
Mandible: Molar conical, primary plate 
with 4-5 teeth, accessory plate with 4 teeth, 
^ Contribution No. 100 from the Allan Hancock 
Foundation, University of Southern California. Manu- 
script received February 5, 1952. 
2 Research Fellow, Allan Hancock Foundation. 
Spine row with 5 simple spines. Palp article 
3 two thirds as long as article 2. 
Lower lip: Inner and outer lobes well de- 
veloped, apices rounded, mandibular lobes 
short. 
Maxilla 1: Inner plate with 3 long setae 
and 2 small, medial setae, outer plate with 9 
spines; apex of palp article 2 with an acute 
tooth, 3 spines and 2 setae. 
Maxilla 2: Inner plate broader than outer, 
inner edge lined with several strong setae. 
Maxilliped: Inner plate subrectangular, 
apex truncate, but with rough indentations, 
armed with 3 spines and several setae; outer 
plate reaching to middle of palp article 2, 
strongly armed with setae. Palp article 4 slen- 
der, conical, curved, about as long as article 3. 
Gnathopod 1: Coxa not triangular, infero- 
anterior edge rounded; article 2 rather stout; 
article 4 large, posterior surface echinulate; 
article 5 slightly longer than 4, attached along 
the anterior surface of the latter; article 6 
longer than 5, palm oblique, convex, lined 
with setules, defined by a spine; article 7 
slender, curved, longer than palm. 
Gnathopod 2: Articles 4 and 5 short; article 
5 produced into a posterior setose lobe; article 
6 very large, elongate, palm with a large, 
subacute medial tooth bearing spinules, pos- 
terior to which the palm is hemispherically 
excavated; the posterior wing of the excava- 
tion bearing 3 spines; article 7 strong, curved, 
fitting palm. 
Peraeopod 1 slightly larger than 2, slender, 
articles 4 and 5 equal in length, shorter than 
article 6; article 7 slightly curved. 
Peraeopod 3 shorter than 1, coxa produced 
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