4 
E. B. Wilson — Pycnogonida of New England. 
Pycnogonum littorale 0. Fabr. 
Phalangivm littorale Strom, Sondmor, p. 209, PI. I, fig. 17, 1762. 
Acarus mar inns Pallas. Misc. Zool., p 188. PI. XIV, figs. 21-23, 1766. 
Pycnogonum balcenarum L., Syst. Nat., ed. XII, I., p. 1028, 1767; Chr. Fabr., Ent. 
Syst., vol. iv, p. 416, 1794; Latreille, Hist. Nat. des Crust, et des Insectes, Tom. 
vii, p. 332. 1804; Gen. Crust, et Insect., Tom. i. p. 144, 1806. 
Pycnogonum littorale O. Fabr., Fauna Gronlandica. p. 233, 1780; Abilgaard in 0. F. 
Muller, Zool. Dan., Fasc. 3, p. 68, PI. CXIX, figs. 10-12, 1789; Milne-Edwards, 
Hist. Crust., vol. iii, p. 537, PI. 41, fig. 6; Johnston, Mag. Zool. and Bot., vol. 
i, p. 376, PI. XIII, figs. 1-3; Kroyer, Nat. Tidss., lste Bind, 2det Haefte, p. 
126; Isis, Jahrg. 1846, Heft vi, p. 442; Voy. en Scand., Laponie, etc., Crust., PI. 
38, fig. 4 a-e. ; Hoek, Niederlandisches Archiv fur Zool., Band iii, 3tes Heft, 
p. 236, PI. XV, figs. 1-3. 
Pycnogonum pelagicum Stimpson, Invertebrata of Grand Manan. p. 37. 1853. 
? Pychnogonum littorale Nicolet, in Gay, Historia fisica y politica de Chile, Zoologia, 
p. 308, PI. 4, fig. 8, 1854. 
PI. I, figs. 1 a, 1 b. PI. II, figs. 3 «, 3 b. 
Body very broad. Lateral processes with scarcely any interval 
between them. Neck somewhat constricted, but broad and stout. 
Each segment has a prominent conical tubercle in the median line 
above, and one or two less prominent ones on each lateral process. 
Oculiferous tubercle prominent, broad and rounded. Eyes black, 
widely separated, remarkably small. Abdomen slender, decidedly 
clavate, truncated at the extremity. Rostrum large, slender, basal 
half slightly swollen, outer portion attenuated, rounded at the tip. 
There is a slight constriction near the middle and another near the 
extremity, which give it a distinctly sinuous outline. 
Accessory legs very small and slender, composed of nearly equal 
short articulations, the first five of which are somewhat shorter than 
the others; the terminal joint is pointed and slightly curved; the 
outer joints bear a few r small stout spines. 
Legs very stout ; the three basal joints are short and thick, the 
first with two obtuse prominences above ; fourth about twice the 
second, produced at the extremity into a very prominent rounded 
elevation ; fifth similar, but not so much produced distally ; seventh 
joint or tarsus very short and nearly triangular; eighth (propodus) 
narrow, somewhat curved ; dactylus nearly half as long as the pro- 
podus, very stout. 
Many of the joints bear very short hairs, which are densely set on 
the inferior side of the tarsus and propodus. The entire surface of 
the animal is covered with small rounded tubercles, which give it a 
scabrous appearance. Color light yellowish browm to dark brown, 
