THYSAXOPODA COKXUTA. 223 



the end the process is slender and nearly e(iuall>' tliick, 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 jiart, seen from behind, of another specimen in order to show 

 variation of the armature. The median lobe has its ju'oxinial ])art, from its 

 origin to tlie insertion of the lateral process (p"".), long and projinrtionately rathei- 

 narrow, longer than the distal i^art; the terminal jiortion beyond the insertion 

 of the usual additional process (p^.) is an oblong, distally produced, acinninate 

 and acute lobe (fig. 2d and fig. 2i). The lateral process (p'.j is slender, somewhat 

 long, curved, and with the short terminal, acute part bent inwards and forwards. 

 The additional process (p°.) is an oblong-o-\-al, rather thick, yet somewhat 

 obliquely vaulted body with the distal end produced into a small, conical, 

 oblicjue, acute tooth. But a little lieyond the lateral process there originates a 

 small, very slender seeontlaiy additional jirocess (p''. ) sha]ied nearh' as a spine 

 with the terminal portion bent inwards (o\-erlooked 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 ciuite as in T. pcrtiiidtn. 



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 nun. 

 in length. 



Distribution. — Some specimens were taken at four localities in the Indian 

 Archipelago by the "Siboga." In 1910 the Prince of Monaco captured se\eral 

 fine specimens at three localities in the North Atlantic West of Southern Spain. 



Group I). Carapace with a wcll-dn'cloped cervical (jnuirc. Maxillulae irilh the 

 pseudexopod somewhat small, scarcely or not at all (nrrreachinij the iinl< r nninjin. 

 of third joint and witli the palp rery long. Si.rth (d)dominal .^cgnu'tit .^holier than 

 the fifth. 



9. Thysanopoda cornuta Illig. 



1905, March 2S. Thysanopoda conmla Illig, ZcioI. Anz., 28, p. 0113 (with three tiguies in tlie text). 

 1905, April 1. Thysanopoda insignis II. J. IIan.-^f.n, Hull. Mus. Oeeaii. JMoiiaco, no. 'M. p. 19 



(with three text-figures). 



Sta. 4G70. Nov. 20, 1904. I.at. 12° 8.7' S., long. 79° 2.4' W. Trawl, :?209 fm,';. 1 specimen. 



The single specimen is an extremely large female measuring 7.") mm. in length, 

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

 liminary description and figures in the jiaper ([uoted. 



