Laguna ®Barine Laboratorp 143 
peduncle somewhat longer than the first jot and about three times 
as long as the third joint. Antenna two about two-thirds as long 
as antenna one; thirteen-jointed flagellum about one-half as long 
as peduncle. Upper lip slightly bi-lobed. Mandibular palp quite 
large, second joint broader and longer than the third, both armed 
with long, slender spines. Mavxilla one with rather large, triangular 
shaped inner plate, fringed with fine sete on the inner edge, and 
armed with one compound, apical spine. Maxillipeds with outer 
plates much larger than the inner, and carrying several compound 
sete along the apical margin, finely toothed and setose along the 
inner margin; palp long and strong. Pleopods rather large and 
very much alike, the sub-equal rami bearing long, compound sete. 
Telson long. Pleon segments all toothed posteriorly. Length 5-7 
mm. 
Laguna Beach, California. Frequent in kelp holdfasts from deep 
water. Coll. V. R. Stout. 
Genus Acanthogrubia n. gen. 
Head without rostrum. Side-plates one to five well developed, 
fifth the broadest and deepest. Antenna one not as long as peduncle, 
with four-jointed accessory flagellum. Antenna two, two-thirds as 
long as antenna one, with peduncle slightly longer than flagellum. 
Mouth parts prominent. Upper lip broadly rounded. Lower lip 
with well developed inner lobes, and bifid outer lobes with prominent 
mandibular processes. Mandible normal, third joint of palp broadly 
rounded at apex, and armed with numerous long sete. Maxilla one 
armed with ten apical spines, second joint of palp broad with several 
spines on the apex and inner margin. Mavxilla two outer plate the 
broader; inner plate as long as outer and thickly fringed on inner 
margin. Mavillipeds, outer plates large. Gnathopods one and two 
subchelate, gnathopod two the larger. Pereopods one and two lone, 
slender, second joint slightly expanded. Pereopod three, seeond 
joint expanded, broader than long. Perwopods four and five the 
longest. Uropod three, outer ramus with two hooks. Telson short 
and broad, armed only with sete. 
This genus differs from Amphithoe in having an accessory flagel- 
lum on the first antenna. It also differs from Paragrubia in having 
a four-jointed instead of one-jointed accessory flageHum, in having 
the flagellum of the second antenna not eloneate, and the second 
joint of the third perwopod as broad as lone. 
