Archive image from page 159 of Discovery reports (1936) Discovery reports discoveryreports12inst Year: 1936 144 DISCOVERY REPORTS a measurement of 45-50 mm. in length. In spirit about the first 30 chaetigers are colourless, and behind this the back develops a greenish colour which increases in in- tensity from before backwards. In some of the specimens the dorsal surface of the hindmost region is a greenish black interrupted by narrow light green intersegmental bands. The head has about nine rings and ends in four small tentacles. None of the specimens has the proboscis everted. I see betwee
Archive image from page 159 of Discovery reports (1936) Discovery reports discoveryreports12inst Year: 1936 144 DISCOVERY REPORTS a measurement of 45-50 mm. in length. In spirit about the first 30 chaetigers are colourless, and behind this the back develops a greenish colour which increases in in- tensity from before backwards. In some of the specimens the dorsal surface of the hindmost region is a greenish black interrupted by narrow light green intersegmental bands. The head has about nine rings and ends in four small tentacles. None of the specimens has the proboscis everted. I see between 15 and 20 X-shaped paragnaths and ac- cording to Arwidsson the paired jaw plates each T r . 1 y r- -11 r 1 Fig. 26. Gh'cinde armata. have five teeth. 1 figure some papulae from the rf ,1 r' 1 ° Papulae irom proboscis. proboscis (Fig. 26). The change over from the uniramous to the biramous condition of the feet takes place between the 30th and 35th chaetigers. In the uniramous region there is a large dorsal cirrus, a chaetal lobe with a pair of conical lips of which the hinder is longer than the anterior, and a ventral cirrus a little longer than the foot. In the biramous region there is a triangular dorsal cirrus, a small rounded dorsal lobe, a large ventral lobe with two digitiform anterior lips, and a single conical posterior lip and a triangular ventral cirrus. The ventral bristles are all compound with lightly denticulated end-pieces; the dorsal bristles are stout acicular bristles surmounted by a kind of plume. In regard to the eyes in this species, Arwidsson gives two pairs, but I can see only one pair in the present specimens. Remarks. This species is akin to the northern G. tiordmanni, but is easily dis- tinguished by the division into two lobes of the anterior lip of the ventral ramus in the hinder region. This also distinguishes it from the Brazilian G. tnidtidens, F. Miiller. In the original description of G. pacifica, mihi, from the Panama region I gave no acco
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