JOURNAL OF ENTOMOLOGY AND ZOOLOGY 223 



cave on the Inner margin for about half its length. Branchia nearly 

 round. Third, fourth and fifth persopods (Fig. 4) similar in 

 structure, short, stout, and armed with stiff hairs; hand nearly as 

 long as rest of the extremity; palm broad and armed with numerous 

 hairs, inner margin slightly conca\-e, with two serrate teeth at the 

 base. 



Length of specimen, 13 mm. 



Color varying from a bright red to white. 



Several specimens taken at Laguna Beach the latter part of July, 

 from the Rhodophycea? on the rocks. 



The young of this species were very abundant at Laguna Beach, 

 and I will give a short description of one because of the great vari- 

 ation from the adult. Plate II shows a young male with the 

 antennae inverted showing the seta? on the ventral side. The first 

 five segments are of nearly equal length; peraeon smooth; superior 

 antennje nearly half as long as the body, with inferior nearly as 

 long as superior; flagellum with six to nine joints. Maxillipeds 

 (Plate III, Fig. 5) with inner plate reaching apex of first joint of 

 palp, armed with two teeth and spines; outer plate reaching apex of 

 second joint of palp and armed with three small teeth. Upper lip 

 (Fig. 6) bilobed, finely ciliated. First maxillae (Fig. 7) two- 

 jointed, palp and second joint armed with spines. Second maxillce 

 (Fig. 8) armed with a few hairs on the tip. Mandible (Fig. 9) 

 has cutting plate made of five strong, unequal teeth; teeth of sec- 

 ondary plate nearly equal. First gnathopod attached far forward, 

 triangular in shape and fringed with hairs. Second gnathopod 

 (Fig. 11) attached the same as in adult, palm convex on inner 

 margin, instead of concave as in adult, and armed with two small 

 teeth near inner margin at the base; finger is concave and uniform 

 in outline. 



Cdprclla septentrioiialis Kroyer 



The specimen here described differs slightly from those described 

 by Mayer, Holmes, Sars and others, yet I do not think the differ- 

 ences great enough to demand the naming of a new species. 



The peraeon (Plate IV, Fig. 12) is comparatively smooth, first 

 two segments long, as long as the rest of the body; cephalon angu- 

 larly produced in front into a very short, blunt spine. Figure 13 



