290 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 5 



long, rather slender, with a thin inner edge. It is a little ventral to the 

 end of the joint and is about half the length of the joint. There are a 

 few small hairs about its base above. There is a very small auxiliary claw 

 on each side of the large terminal one. 



The description given above is that of a male specimen. The female is 

 similar, but there are a few points of difference. They do not differ much 

 in size, but the projection on the 2nd tarsal joint is less prominent in the 

 female. The female also is nearly lacking in ovigers, but they are repre- 

 sented by a small unjointed knob at the base of the proboscis below. Also 

 on the base of the proboscis of the female are 2 swollen elongate areas 

 provided with chitinous thickenings. These are elongate and close to- 

 gether. They seem to be some sort of attachment organ, and are not 

 present in the male. 



Color: Dark brown, red brown, or often greenish; after preserva- 

 tion the color may be pink or red. 



Measurements of the male type : Length of body, 3 ; proboscis, 2.5 ; 

 lateral processes, 1 ; total breadth of body, 2.75. First joint of chelifori, 

 1.1 ; 2nd joint, 0.4. Oviger, 1st joint, 0.07 by 0.03; 2nd joint, 0.075 by 

 0.02; 3rd joint, 1 by 0.02; 4th joint, 0.05 by 0.01 ; 5th joint, 0.03 by 0.01 ; 

 6th joint, 0.01 by 0.01. Spread, 24.5. Abdomen, 0.75 by 0.04. Eye tu- 

 bercle, 0.5 by 0.6 at the base. Length of leg joints, 1st, 0.45; 2nd, 1.2; 

 (projection in female, on the last legs, 0.5;) 3rd, 0.95; 4th, 2.2; 5th, 2; 

 6th, 2.2 ; 7th, 0.25 ; 8th, 1 ; large claw, 0.85. The small one is very small, 

 not more than 0.01 long. 



This species differs from A. calif ornicus in being heavier, with its 

 lateral processes more widely separated. It has much more marked exten- 

 sions on the 2nd coxal joints, and the 1st coxal joint is different in shape. 

 It has attachment discs and vestigial ovigers in the female. It differs from 

 A. erectus in being heavier bodied. Its 2nd tarsals are heavier in this 

 species. The color of the body also differs. In A. erectus it is pale, often 

 light, almost colorless. In A. californicus the color is a deep brown, often 

 red brown to greenish. In preservative it may retain a red-brown or some- 

 times a greenish color for some time. This species is also heavier than 

 A. erectus. I have found it in a number of places along the southern Cali- 

 fornia coast, including the Isthmus at Catalina Island, where it was 

 associated with L. marginatus in Fucus. It is also occasionally hid in the 

 roots of eel grass and in the holdfasts of kelp from deep water. Some 

 specimens were well pitted, dark in color, and some from deep water were 

 overgrown with bryozoans or hydroids. Well-developed eyes were found 



