E. B. Wilson — Pycnogonida of New England. 
19 
Nymphon longitarse Kroyer. 
Nat. Tidss., Isle Bind, 2det lltefte, p. 112. 1844; Toy. en Scand., Laponie, etc., 
PI. 36, fig. 2 a-b: 
Plate VII, figures 2 a to 2 h. 
Entire animal extremely slender. Body smooth. Oculiferous seg- 
ment produced into a very long slender neck, expanding anteriorly 
for the attachment of the antennae. Posterior segment very narrow, 
lateral processes directed nearly backward. Abdomen small, taper- 
ing. Oculiferous tubercle rounded, eyes black, ovate. 
Rostrum slender, rounded, shorter than the basal joint of the 
antennae. 
Antennae very slender, slightly hairy ; claws of chelae very long 
and slender, their tips crossing when closed ; the spines with which 
they are armed are larger and less numerous than those of N. Stromii. 
Palpi resembling those of /V Stromii , but more slender and with 
the fourth joint shorter than the third or fifth. 
Accessory legs remarkably slender; the three basal joints are very 
short and nearly equal ; fourth nearly twice the length of the first 
three united ; fifth somewhat less ; sixth equal to the three basal joints, 
about twice the seventh ; the remaining joints decrease to the last, 
which is claw-like with a few spines on its inferior margin; spines of 
the distal joints decidedly curved. 
Legs resembling those of JV. Stromii but much more slender and 
with the tarsus very long, nearly twice the propodus ; both these 
joints are very slender, nearly straight, and along their entire inferior 
margin is a regular series of small hairs ; dactylus nearly straight, 
very acute, more than half the propodus ; auxiliary claws very small, 
about one-fourth the propodus. The legs are sparsely hairy, the 
hairs longest near the outer extremities of the joints, where they often 
form a semicircle on the upper side. Color, when living, light salmon 
or nearly white. Length 1 millimeters; extent 65 millimeters. 
This species may be readily distinguished by its extremely attenu- 
ated appearance, which is more marked than in any other species of 
the genus. The neck varies considerably and in some specimens is 
much stouter than in others (see Plate N il, figures 2 a lo 2 c). 
Its range is nearly coincident with that of the preceding species, 
but it is not yet recorded from the Gulf of St. Lawrence, though not 
rare off Halifax. It was dredged in 60 fathoms on St. George’s Banks, 
in L872, by Smith and I larger. It. is most often found on muddy 
bottoms, though occurring also on rocks and fine sand. 
