CALIFORNIA STALK-EYED CRUSTACEA. 203 



the upper margin armed with 4-6 small teeth, the posterior one on the 

 carapace, the anterior one a little behind the middle of the rostrum; lower 

 margin armed with 4-6 teeth, the anterior tooth commonly near the tip. 

 Ocular peduncles with an ocellus on the posterior side. The spine on the 

 outer side of the base of the antennules reaches about to the tip of the first 

 joint; antennal scale narrow, about equalling the length of the rostrum, 

 the sides parallel, the inner, membranous portion projecting much beyond 

 the outer distal spine; flagellum about as long as the body; the peduncle 

 reaches about as far forward as the penultimate joint of the peduncle of 

 the anteunules. The external maxillipeds scarcely reach as far forward as 

 the middle of the rostrum; last joint flattened, somewhat twisted, the tip 

 armed with dark colored spines. The anterior chelipeds do not reach as 

 far forward as the maxillipeds; hand thick at the base. Second pair of 

 chelipeds reaching beyond the tip of the antennal peduncle; first and 

 third joints of the carpus subequal and longer than the second; fourth 

 and fifth joints subequal and shorter than the third; sixth joint the 

 shortest of all; seventh about as long as the two preceding ones combined; 

 hand narrow, the palm a little longer than the last joint of the carpus. 

 Posterior legs rather stout, the extero-distal angles of the merus joints 

 armed with 1-3 spines, the last pair seldom having more than one. The 

 third segment of the abdomen is posteriorly produced and crested. Tel- 

 son with four pairs of spines on the dorsal surface. 



Dredged in large numbers in shallow water in Mon- 

 terey Bay, November, 1895. 



The color varies with the surroundings. Specimens 

 among the bright green sea-weeds are of a uniform 

 bright green color, while other specimens living only a 

 few yards away among the red sea-weeds imitate almost 

 exactly the color of the algse that surround them. 



Collection University of California. 



Heptacarpus tenuissimus, sp. nov. 



A very slender species. Anterior half of the carapace crested. Suborb- 

 ital and antennal spines well developed. Eostrum longer than the cara- 

 pace, horizontal and very slender, scarcely higher than wide, gently arching 

 over the eyes, and armed above with four spines, the posterior spine on 

 the carapace, the anterior one near the middle of the rostrum, the distal 

 half of the upper margin being smooth; lower side of the rostrum with 

 five teeth. Basal spine of the antennules scarcely reaching the tip of the 

 first joint. Acicle long and narrow, about equalling the rostrum, the 



