PYCNOGONIDA OF NEW ENGLAND AND ADJACENT WATERS. 475 



Specimens examined. 



Achelia scabra, sp. nov. 



Body nearly orbicular, witliout distinct segmentation. Lateral pro- 

 cesses comparatively short and stout, scarcely separated from each 

 other ; all except the posterior pair have two prominent conical spinous 

 tubercles on the upper side near the outer margin ; there is a similar 

 but larger tubercle on each side of the neck, anterior to the first lateral 

 process. Oculiferous tubercle obtuse, very large and stout ; eyes large 

 and conspicuous, black. Abdomen long arid slender, constricted in the 

 middle, bifid at the tip 5 along the sides it is somewhat spinous. 



Eostrum large and stout, obtusely rounded-conical. 



Antennae extending to about the middle of the rostrum, very stout ; 

 basal joint about two and a half times as long as broad, second joint 

 very short and stout, ovoid. 



Palpi nearly as in A. spinosa. The hairs upon the exterior margin of 

 the distal joints are very stout and close-set. 



Accessory legs also much like those of A. spinosa, and presenting 

 similar sexual differences; in the female they are much smaller, and 

 with the third, fourth, and fifth joints much shorter than in the male; 

 the terminal joint is, in both sexes, very minute. 



Legs rather long, very rough and tuberculose, so that the outlines, 

 particularly of the outer joints, are very irregular ; tarsus very short 

 and small, propodus stout and curved, dactylus two-thirds thepropodus; 

 auxiliary claws very slender and small, scarcely one-fifth the dactylus. 

 This latter joint has upon the lower (concave) margin three stout, 

 curved, divergent spines, at the basal angle, followed by an irregular 

 series of smaller ones. The tarsus is also armed, upon its lower side, 

 with a number of spines. 



The whole surface of the legs and body is rough and scabrous; many 

 of the larger tubercles upon the legs are tipped with stout hairs or 

 slender spines ; but these are nearly wanting on the three basal joints, 

 and are everywhere less numerous and conspicuous than in A. s])inosa. 

 Color in alcohol, dirty white. Length 2.3 millimeters. 



This species, which I at first mistook for A. splnosa, is represented by 

 only two si)ecimens, as follows : 



