THYSANOPODA CORNUTA. 223 
the end the process is slender and nearly equally thick, but the rather short 
distal portion is conspicuously thickened and furnished with minute teeth along 
one margin and with 2-4 longer teeth from the margins just before the incurved, 
tooth-shaped end. Fig. 2f gives the distal part of this process seen from behind 
and fig. 2g the same part of the same specimen seen from in front; fig. 2h repre- 
sents the same part, seen from behind, of another specimen in order to show 
variation of the armature. The median lobe has its proximal part, from its 
origin to the insertion of the lateral process (p*.), long and proportionately rather 
narrow, longer than the distal part; the terminal portion beyond the insertion 
of the usual additional process (p°.) is an oblong, distally produced, acuminate 
and acute lobe (fig. 2d and fig. 21). The lateral process (p*.) is slender, somewhat 
long, curved, and with the short terminal, acute part bent inwards and forwards. 
The additional process (p°.) is an oblong-oval, rather thick, yet somewhat 
obliquely vaulted body with the distal end produced into a small, conical, 
oblique, acute tooth. But a little beyond the lateral process there originates a 
small, very slender secondary additional process (p°.) shaped nearly as a spine 
with the terminal portion bent inwards (overlooked by me in the “Siboga”’ 
material). The auxiliary lobe is of moderate size and the setiferous lobe moder- 
ately broad; the latter is furnished with setae quite as in 7’. pectinata. 
Length of adult males from 23 to 27.5 mm., of the largest female from the 
East Pacific 24.5 mm., while a large female from the “‘Siboga” measured 38 mm. 
in length. 
Distribution Some specimens were taken at four localities in the Indian 
Archipelago by the ‘‘Siboga.”” In 1910 the Prince of Monaco captured several 
fine specimens at three localities in the North Atlantic West of Southern Spain. 
Group b. Carapace with a well-developed cervical groove. Mazxillulae with the 
pseudexopod somewhat small, scarcely or not at all overreaching the outer margin 
of third joint and with the palp very long. Sixth abdominal segment shorter than 
the fifth. 
9. Thysanopoda cornuta I.1ia. 
1905, March 28. Thysanopoda cornuta Iuu1G, Zool. Anz., 28, p. 663 (with three figures in the text). 
1905, April 1. Thysanopoda insignis H. J. Hansen, Bull. Mus. Océan. Monaco, no. 30, p. 19 
(with three text-figures). 
Sta. 4670. Nov. 20,1904. Lat. 12°8.7’S., long. 79° 2.4’ W. Trawl, 3209fms. 1 specimen. 
The single specimen is an extremely large female measuring 75 mm. in length, 
but unfortunately considerably damaged. It agrees excellently with my pre- 
liminary description and figures in the paper quoted. 
