CALIFORNIA STALK-EYED CRUSTACEA. 57 



obliterated above by the fusion of the two sides; the anterior margin of 

 the lobes may be straight, or, more often, slightly concave; seen from in 

 front they are gently arched upward, or in some cases very strongly so. 

 Antero-lateral margin armed with eight or nine small subacute teeth whose 

 bases are generally narrower than the spaces between them; postorbital 

 tooth small; next tooth also small, depressed and often lobate, and sepa- 

 rated from the postorbital by a considerably greater interval than from the 

 succeeding tooth; at the rounded sides of the carapace the teeth become 

 larger, more acute, and more closely set. There is a tendency to alterna- 

 tion in the size of the teeth; the fourth tooth, counting the postorbital, is 

 larger than the fifth, and the sixth and eighth are larger than the seventh; 

 ninth tooth small and situated behind the lateral angle; a small tenth tooth 

 often occurs closely behind the ninth. On the outer margin of the orbit 

 above the postorbital tooth there are two small, blunt teeth separated by a 

 narrow fissure; preorbital tooth distinct; suborbital lobe acute. Basal 

 joint of the antennules with a pronounced ridge on the outer surface with 

 a groove on either side. Merus of the maxillipeds obliquely truncated at 

 the anterior end. Merus of the chelipeds hairy above; carpus rugose, 

 and furnished with two blunt teeth at the antero-internal angle; hand 

 rugose above, and rather long, with the upper and lower margins nearly 

 parallel; fingers long, sulcate, not gaping, and colored brown, with light 

 colored tips. Legs with the margins hairy; dactyls longer than the pro- 

 podi and terminating in nearly straight, corneous claws. Abdomen in the 

 male narrow, the second joint a little over a half longer than wide, penul- 

 timate joint longer than wide; last joint about as long as broad, with the 

 distal end rounded. In the abdomen of the female the second joint is 

 longer than the third or fourth, which are subequal and shorter than the 

 fifth; sixth joint the longest, nearly equaling the third and fourth com- 

 bined; last joint broader than long, and in adult specimens broadly 

 rounded at the tip. 



The following measurements are from a series of 

 specimens from San Diego, California: 



Length of Carapace. Width of Carapace. 



Male. 25.75 mm. 38.75 mm. 



" 25 mm. 37.5 mm. 



" 24 mm. 35.25 mm. 



" 23 mm. 35 mm. 



" 22 mm. 32 mm. 



" 20 mm. 30 mm. 



" 18 mm. 26 mm. 



" 14.75 mm. 21 mm. 



" 12 mm. 17 mm. 



