Two New Spongicolous Amphipods (Crustacea) 
From California 1 
J. Laurens Barnard 2 
Two NEW SPECIES of gammaridean Am phi - 
poda, described herein, were collected from 
spiculated homy sponges in Newport Bay, 
California. One of these species is of special 
interest for it probably derives its nourish- 
ment from the sponge tissues while the other 
may be only a facultative inhabitant of 
spongocoels. Arndt (1933) may be consulted 
for an interesting discussion and review of 
other amphipods inhabiting sponges, most of 
which take refuge in spongocoels for protec- 
tion and easy access to minute food particles 
other than the host’s tissues. 
The writer is indebted to the Allan Hancock 
Foundation for use of laboratory space and 
equipment and to Dr. John L. Mohr and Mr. 
R. H. Linsley for procuring the animals. 
Family LEUCOTHOIDAE 
Leucothoides pacifica, new species 
Figs. 1 , 2e, h, n 
DESCRIPTION OF MALE: Head with a short, 
blunt rostrum, lateral lobes broadly rounded, 
lower anterior corner rounded; eyes large, 
composed of a few large facets. 
1 Contribution No. 145 from the Allan Hancock 
Foundation, University of Southern California. Man- 
uscript received April 30, 1954. 
2 Department of Biology, University of Southern 
California, Los Angeles, California. 
Antenna 1 longer than 2, articles of pe- 
duncle successively slightly shorter, flagellum 
slightly shorter than peduncle, with 10 arti- 
cles; accessory flagellum minute, biarticulate. 
Antenna 2 with article 5 of peduncle shorter 
than 4, flagellum with 4 articles, shorter than 
article 5 of peduncle. 
Mandible with 10 spines in spine row, palp 
with one article bearing 2 terminal setae; 
molar absent. 
Maxilla 1 with 7 spines on outer plate and 
3 on distal end of palp article 2. Maxilla 2 
sparsely setose. 
Inner plates of maxilliped coalesced at base 
only, not reaching to base of outer plates, 
each distal edge armed with 3 spinules; outer 
plates conical, short, .each armed with 2 
spines. 
Gnathopod 1 complexly chelate, coxa pro- 
duced narrowly in front, articles 5 and 6 with 
the apposing edges minutely serrated; pos- 
terior edge of article 6 with several short, 
widely spaced spinules; distal end of process 
of article 5 with a long, blunt spine; article 
7 minute, curved. 
Gnathopod 2 with article 5 four fifths as 
long as 6, greatly produced and setose behind, 
article 6 not expanded distally, palm slightly 
oblique, convex, serrated irregularly, defined 
by 3 spines; article 7 stout, strongly curved, 
nearly as long as palm. 
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