THYSAXOPODA CORNUTA. 223 



the end the process is slender and nearly equally thick, but the rather short 

 distal portion is conspicuously thickened and furnished with niinute 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 oi-dcr 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. 2i). 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 T. pedinata. 



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. Ma.xillulac 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 Illig. 



1905, March 28. Thysanopoda cornuta Illig, Zool. Anz., 28, p. 663 (with three figures in the text). 

 1905, April 1. Thysanopoda insignis H. J. Hansen, Bull. Mus. Ocean. 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, 3209 fnis. 1 specimen. 



The single specimen is an extremely large female measuring 75 ram. in length, 

 but unfortunately considerably damaged. It agrees excellently with my pre- 

 liminary description and figures in the paper quoted. 



