6 
K. B. Wilson — Pycnogonida of New England. 
Abdomen rather large, tapering, truncated and slightly bifid at the 
extremity; it usually projects vertically upwards. 
Rostrum very large, rounded-conical, little constricted at the base, 
somewhat shorter than the body. 
Anteume rudimentary, consisting of a single knob-like joint which 
is thinly covered with hairs. 
Palpi slightly longer than the rostrum ; the first, second, fourth 
and fifth joints are nearly equal, and about as long as broad ; the 
third and sixth are nearly equal, and about twice the others. The 
outer joints are somewhat hairy, the terminal one most so. 
Accessory legs about half as large in the male as in the female. 
In the latter the basal joint is somewhat swollen and about as long as 
broad. The second, fourth and fifth are nearly equal, and longer than 
the third ; the remaining joints are short, decreasing in size to the 
last, which is very small. In the male the proportions are nearly the 
same, but the third joint is proportionally longer, and all of the 
others are more robust. The three outer joints are nearly globose, 
the terminal one minute. This joint bears, in both sexes, two spines, 
one of which is sometimes bifid at the tip. Other spines occur on 
the four preceding joints and are sometimes bifid. 
Legs rather stout, sparsely hairy, the fifth and sixth joints having, 
above, alternate depressions and elevations producing a deeply sinuous 
outline ; each of these elevations bears a number of hairs. The 
three basal joints are very stout and short ; the three following are 
each about equal to the three basal joints united ; tarsus nearly tri- 
angular, with two or three stout spines below ; propodus strongly 
curved, with a series of stout curved spines on the lower margin, on the 
upper side hairy ; dactylus more than half the propodus, stout and 
curved ; auxiliary claws about half as long as the dactylus. 
Color of alcoholic specimens, light yellowish brown. Length 15 ' 
millimeters; extent 6 -4 millimeters. 
The egg-masses are three or four in number and of a light yellow 
color. In some specimens the embryos had escaped from the eggs ; 
they closely resemble those of Achelia , described on p. 8 (PI. II, 
fig. 1 g), and the antennae are large and chelate. 
This genus, recently described by Miers from specimens collected 
at Kerguelen Island, is interesting from the extreme reduction of the 
antennae, approaching, in this respect, those forms in which antennae 
are altogether wanting. This species is not uncommon in \ ineyard 
Sound, and occurs as far south as Virginia, where it was collected by 
Mr. S. F. Clark. Two specimens were found on Botryllus Gotddii 
