ILaguna 0arine llaboratorp 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- 

 slinped, and fuses in back with outer ribbon. Outer ribbon also 

 narrow, more broadly U-shaped and extending forward to a point 

 half way between coxa? 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 joints. Armor rather strong. Eye- 

 plates poorly outlined but with strongly pigmeuted eye-spots. There 

 is also a median, smaller, similarly pigmented spot between and 

 above the coxae 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. 

 Epimera 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. Epimera three and 

 four fuse at base. Genital opening a long narrow slit between bases 



