116 CALIFORNIA ACADEMY OF SCIENCES. 



fewer spines above; hand shaped as in Mertensii, but having only two 

 rows of spines on the outer surface and a row of small spines on the inner 

 edge; there is a broad, smooth interval on the outer surface, which in 

 Merlensii is armed with the median row of spines. The number and 

 arrangement of the spines on the smaller hand is the same as in the pre- 

 ceding species, with the exception that there is no spine behind the gap 

 between the fingers. 



Described from numerous specimens in the National 

 Museum from Humboldt Bay (No. 19443, Albatross col- 

 lection); Behring Is., Kadiak Is. (Schalfeew). 



Genus Dermaturus Brandt. 



Carapace more or less lyrate, devoid of prominent spines or tubercles 

 and marked with transverse strias; lateral margins unarmed. Rostrum 

 triangular, simple. A small tooth on the margin of the orbit within the 

 outer orbital angle. First and second joints of the antennas with a spine 

 at the outer angle; acicle oblong, straight; last two joints of the peduncle 

 subcyliudrical. Last two joints of the maxillipeds not dilated. Chelipeds 

 very unequal, not flattened; hands rounded, fingers excavated within. 

 Ambulatory legs subcylindrical; dactyls spiny below and armed with 

 long, sharp claws. Abdomen soft, loosely inflexed. 



Type. D. Mandtii BRANDT. 



Dermaturus Mandtii Brandt. 



Dermaturus Mandtii BRANDT, Bull, phys.-math. Acad. imp. sci. St. 



Petersb., Tome VIII, 1850, p. 50; Melanges biologiques, Tome I, 



1850, p. 58. STIMPSON, Proc. Acad. Nat. Sci. Phila., 1858, p. 232. 



BOCTVIER, Ann. Sci. nat. (7), Tome XVIII, 1895, p. 173; Ibid. (8), Tome 



I, 1896, p. 19. 

 Hapalogaster Mandtii SCHALFEEW, Melang. biol., Tome XIII, 1892, p. 332, 



figs. 2 and 5c, du Bull. Acad. imp. sci. St. Petersb., Tome XXXV, 



1892, p. 338. 



Carapace narrowly lyrate, not much wider behind than in front, the 

 upper surface unarmed, but marked with prominent, transverse striae, the 

 anterior edges of which are furnished with short, appressed setae. Ros- 

 trum prominent triangular, having a minute knob of granules just behind 

 the acute tip. Outer orbital angles acute, reaching about as far forward 

 as the middle of the rostrum; a small, but prominent tooth on the trans- 

 verse posterior margin of the orbit a short distance internal to the outer 

 angle. Eye-peduncles with transverse, setose ridges. The spine at the 



