44 PROCEEDINGS OF THE CALIFORNIA 



smooth, body not greatly compressed. Epimera of second segment overlap- 

 ping those of preceding and succeeding segments. 



Flagella of inner antenna; about half as long as body, those of outer antennae 

 more than three-quarters as long as body. 



Hands of first pair of legs dissimilar both in size and form. Fingers of 

 smaller pair straight, parallel and slender, closely fitting; the manus with a 

 spine above, and a constriction posterior to the insertion of tbe dactylos. 

 Manus of larger or right hand large, with a large spine on the outer side, 

 continued as a carina for a considerable distance backwards, and with a deep 

 sulcus above the carina. Dactylos short, curved obliquely downwards, thick 

 and swollen at the extremity. A deep transverse sulcus between the dactylos 

 and manus, ending in an oblique longitudinal sulcus having its origin on the 

 upper edge of the mauus; from the latter sulcus a second transverse one is 

 continued down the inner side of the manus. 



Both hands setose, the hairs long and numerous. 



Carpus of second pair five-jointed, third and fourth joints shortest, the 

 mauus and dactylos slender. 



Length, 1.05. 



Color, in alcohol, a light flesh tint, much deeper on the large hand. A 

 darker spot on the upper surface of the carapax, also on the anterior edge of 

 the two first abdominal segments. 



This species lives in pools on rocky reefs at low-tide level, and is capable 

 of producing, by clapping together the fingers of the larger hand, a snapping 

 noise like that which can be made with the finger-nail. 



Collected at Santa Barbara Island by S. A. L. Branuan. 



Idotcea pulchra. 



Body stiffly articulated. Cephalic shield emarginate in centre of front form- 

 ing two lobes. 



First thoracic segment concave in front, advancing around the head; first 

 f»ur thoracic segments sub-equal in length; 3d and 4th about equal in width; 

 three hinder thoracic segments much shorter. Abdomen one-jointed, one 

 6hort partial suture on each margin near thorax, tapering to posterior ex- 

 tremity, which is narrow, but concave. Margins of all the thoracic segments 

 deflected outwards horizontally. 



Flagellum of outer antenna? not quite as long as base, 16-jointed, base some- 

 what setose. Inner autennae very short. 



Length 1.15 in , breadth 0.52 in. . 



When recent, the coloration of this species is very beautiful, consisting of 

 red cloudings ou a lighter grouud. 



The two specimens, male and female, in this collection were brought from 

 the W. coast of Alaska, N of Bheriug's Strait, by W. J. Fisher, Naturalist 

 of the U..S. S. Tascirora, Deep-Sea Sounding Expedition. 



Idolaga. now gen. 



Last pair of abdominal appendages operculiform, and concealing all the 

 preceding pairs, as in Ido'.wa, but with four posterior pairs of legs, with 



