532 PYCNOGONIDA wCHAP: 
about four rows of teeth; five pairs of legs, destitute of accessory 
claws; genital apertures on all the legs (Bouvier). 
Decolopoda australis, Kights ' (1834), a remarkable form from 
the South Shetlands, recently re-discovered by the Scotia expedi- 
tion. The animal is large, seven inches or more in total span, 
in colour scarlet; it was found in abundance in shallow water 
and cast upon the shore. The body is greatly condensed, the 
proboscis is “clavate, arcuated downwards,’ and beset with 
small spines. A second Antarctic species, D. antarctica, has been 
described by Bouvier. The presence of a fifth pair of legs 
distinguishes Decolopoda trom all known Pycnogons, except 
Pentanymphon. Stebbing would ally Decolopoda with, or even 
include it in, the Nymphonidae; but the presence of a second 
joint in the chelophoral scape, the number of joints in, and the 
armature on, the ovigerous legs, and the deflexed proboscis, are 
all characters either agreeing with or tending towards those of 
the Kurycididae ; while the Colossendeidae would be very lke 
Decolopoda were it not for the complete suppression of the 
chelophores. It seems convenient to constitute a new family 
for this remarkable form. 
Fam. 2. Colossendeidae (Pasithoidae, Sars).—Appendage I. 
absent in adult ; appendage II. very long, 10-jointed ; appendage 
III. 10-jointed, clawed, with many rows of teeth ; auxiliary claws 
absent ; segments of trunk fused ; proboscis very large, somewhat 
mobile ; genital apertures, in at least some cases, on all the legs. 
Pasithoe, Goodsir (1842), which Sars assumes as the type of the 
family, is here relegated to Ammothea.” Colossendeis, Jarszynsky 
(1870) (Anomorhynchus, Miers (1881), Rhopalorhynchus, Wood- 
Mason (1873) ), remains as the only genus commonly accepted : 
large, more or less slender short-necked forms; world-wide, 
principally Arctic, Antarctic, and deep-sea; about twenty-five 
species. The largest species, C. gigas, Hoek, from great depths 
Exped. 1899; Mobius, Fauna Arctica, 1901, Valdivia Exped. 1902; Cole, Harri- 
man Alaska Exped. 1904; Hodgson, Discovery Exped. 1907 ; Bouvier, Exp. 
Antarct. Fr. 1907. 
1 Boston Journ. Nat. Hist. i., 1834, p. 203; Cf. Hodgson, Pr. &. Phys. Soc. 
Edinburgh, xvi., 1905, p. 35; Zool. Anz. xxy., 1905, p. 254; Discovery Hup., 
“*Pyenogonida,” 1907 ; Bouvier, Hap. Antarct. Fr. 1907. 
2 See pp. 535, 541. Cf. Dohrn (¢. cit.), p. 228. 
3 The first known species was described as Phowichilus proboscideus, Sabine, 
from the shores of the North Georgian Islands (1821). 
