CALIFORNIA STALK-EYED CRUSTACEA. 183 



merus of both trigonous, compressed, smooth, the upper surface edge 

 ending abruptly, forming a sharp angle or tooth; carpus of smaller cheli- 

 ped rounded, with a tooth at the anterior end of the upper side; carpus of 

 the large clieliped very short, especially below, and devoid of teeth; large 

 hand oblong, compressed, and greatly developed, being considerably larger 

 than the thorax; proximal portion smooth and nearly naked, the distal 

 portion deeply sculptured; a little in front of the middle of the palm the 

 upper and lower edges are crossed by deep, transverse sulci, which are 

 nearly opposite each other and are continued towards each other on the 

 inner surface of the hand, their ends being separated by a shallow, longi- 

 tudinal depression; the upper transverse sulcus is curved abruptly forwards 

 a little external to the upper edge of the hand and joins a deep, transverse 

 sulcus on the outer face behind the articulation of the finger; this last 

 sulcus is continuous at its lower end with a longitudinal sulcus which ends 

 near the middle of the palm; the transverse sulcus crossing the lower edge 

 of the hand is curved abruptly forwards a little external to the lower mar- 

 gin, forming a longitudinal sulcus which extends to the end of the pollex; 

 this sulcus is separated from the longitudinal one above by a ridge which 

 narrows dis tally and terminates in a curved spine or tooth just below the 

 articulation of the dactyl and behind a short groove uniting the lower lon- 

 gitudinal sulcus with the one above it; dactyl flattened, inclined down- 

 wards, but working horizontally, the outer margin strongly convex, the in- 

 ner concave near the thickened tip, but widened into a concave prominence 

 near the base; the postero-external angle is flattened, forming a smooth sur- 

 face which, when the finger is opened, abuts against a similarly flattened 

 prominence behind it; pollex deeply grooved for the reception of the dactyl, 

 ending below in a short, curved tooth. The small hand is several times 

 smaller than the larger one and not so deeply sculptured; the fingers are 

 similar, longitudinal, and about as long as the palm, which is oblong and 

 compressed; a small carina on the upper edge of the dactyl which does 

 not reach the tip; a spine behind the articulation of the dactyl. Carpus 

 of the seicond pair of legs five-jointed, the first two joints subequal, each , 

 about as long as the fourth and fifth combined; third and fourth joints 

 subequal, each shorter than the fifth; hand naiTow, fingers slightly longer 

 than the palm, which is subequal to the last joint of the carpus. The two 

 following pairs stout, the merus large and armed with a spine near the 

 infero-distal angle; carpus with a spine at the infero-distal angle and 

 another further back; propodi with five or six spines below. Last pair of 

 legs much less stout than the preceding pairs; merus and carpus devoid 

 of a spine at the infero-distal angle; spines on the propodi feeble; dactyls 

 of all the pairs short, curved, with a small spine behind the tip. Telson 

 furnished above with a broad, shallow groove and two pairs of spinules. 



Length of body, 31 mm.; of carapace, 11 mm.; of large hand, 18 mm.; 

 of small hand, 11 mm. 



