Laguna Warine Laboratorp 183 
in shape with fairly sharp corner in front and to the outside of the 
body. Eye-spots lacking. Central back ribbon narrow and U- 
shaped, and fuses in back with outer ribbon. Outer ribbon also 
narrow, more broadly U-shaped and extending forward to a point 
half way between coxe two and three. Body is ellipsoid in outline 
with bluntly wedge-shaped ends and is so much flattened dorso-ven- 
trally that it is very hard to tell even by careful focussing whether a 
feature is on the dorsum or venter. The figure shows the dorsal 
view; the dotted lines indicate sutures that show through from the 
venter. The plain line running across the body just anterior to the 
eye-plates is probably on the venter but the flatness of the body makes 
it uncertain. No hairs on body or legs. Claws furnished with combs 
and folding back into grooves, on all four legs. Mouth parts long. 
The smaller figure shows the serrate tip of the mandibles enlarged. 
One specimen, in tide-pool, Laguna Beach, July. 
Copidognathus curtus n. sp. 
(Figure 101) 
Length of body, 428 micrm. ‘‘Schnabelteil’’ not apparent (prob- 
ably very short). First and second pairs of legs stout and swollen, 
especially the third and fifth jomts. Armor rather strong. Hye- 
plates poorly outlined but with strongly pigmented eye-spots. There 
is also a median, smaller, similarly pigmented spot between and 
above the coxe of legs one. Central! back ribbon broad and U-shaped, 
the other thin and following approximately the outline of the ab- 
domen as far forward as coxa three. Body oval in outline and with- 
out hairs. Legs with a few stout spines. Claws with combs on all 
legs and folding back into grooves on the first two pairs of legs. 
Movable on other two pairs of legs but grooves not apparent. Three 
specimens in tide-pools, and towed among Phyllospadix, Laguna 
Beach, July. Nearest to C. spinula but differs in proportions of the 
legs, presence of combs on all the claws and in other important 
characters. 
Pontarachna cruciata n. sp. 
(Figure 102) 
Length 424-443 micrm. Body highly arched, globular; integu- 
ment smooth. Three pairs of bristles as shown in the side view, 
project in front of the eyes. Maxillary shield broad with rounded 
corners at back; about twice the length of second joint of palpus. 
Kpimera of legs one fuse behind maxillary shield with each other and 
with the genito-ventral plate. Epimera two and three fuse at the 
base and about half way to the edge of the body. Hpimera three and 
four fuse at base. Genital opening a long narrow slit between bases 
