Studies in Laguiia Ampliipoda. 651 



second Joint produced distally behind ; tliird Joint witli process, fourth 

 produced; sixtli Joint broad and thick; eigiit or nine spines on either 

 side of the deep gToove in the oblique palni, into which the stron^ 

 finger closes. Pereiopod 1, second Joint but moderately expanded; 

 fourth longer tlian fiftli, but shorter than sixth ; dactyl long-, curved. 

 Pereiopod 2 similar, a little smaller. Pereiopod 3, second Joint 

 produced into plate, notched in middle behind ; fourth and fiftli joints 

 subequal; sixth long; dactyl similar to 1 and 2. Pereiopods 4 and 5 

 similar, but long-er. All three pair of pleopods well developed, 

 biramous, with finely Compound spinules. Uropod 1 longest, the 

 subequal rami shorter than the peduncle. Uropod 2 with the inner 

 ramus longer and broader, armed on the inner margin. Uropod 3 

 with but one ramus. 



Specimens from the coralline algae between tides were of a 

 soft pinkish violet color with some variations. Those from the tangles 

 set below tides w^ere of a rather duU orange green color. 



L. 3—5 mm. 



From tufts of coralline algae and from Phyllospadix between 

 tides ; also from tangles set below tides. Laguna Beach, Calif. 



Allorchestes oculatus n, sj). 



Differs from A. frequens in the following characteristics: An- 

 tenna with ten-jointed flagellum. Antenna 2 with peduncle nearly 

 as long as the 8-jointed flagellum. Gnathopod 2 of the male with 

 the sixth Joint produced proximally in front, palm more oblique and 

 very long. Eyes very large, black, and almost contiguous behind. 



Read and front of body mottled with bright orange; the rest 

 of the body mottled with dark shades of brown, green and violet; 

 antennae, sage green; the other appendages either transparent or 

 tipped with green. 



Occasional in tufts of coralline algae between tides at Aliso 

 Point, two miles south of Laguna Beach, Calif. 



Lenibos concavus n. sp. 



Body slender, smooth. Head without rostrura ; sidelobes produced 

 between antennae. Eyes small, lateral. Sideplate 1 produced slightly 

 forward ; the fourth not excavate behind ; the bilobed fifth with the 

 front lobe as deep as the fourth. Antenna 1 longer than 2; peduncle 

 with first Joint longer than the third, second longer than the first; 



44* 



