Gatty Ufarine Laboratory^ St. Atidrews. 295 



lateral projection, from which a single bristle projects. Then 

 follows the still narrower anal segment, which has two sub- 

 ulate anal cirri. If Reibisch's figures are to be trusted this 

 species would appear to differ, since he shows only two 

 conical processes terminating the body, but perhaps the cirri 

 had been lost. In the original description of Greef the anal 

 cirri are almost bulbous at the base with a terminal^ slender, 

 subulate process. 



The proboscis occupies the first bristled segment, is nearly 

 circular in outline, with a median fissure from which trans- 

 verse striai pass. A narrow process of the gut joins this to 

 an enlargement between the second and third feet, after 

 which the intestine diminishes to the terminal vent. 



The second example has advanced a little, since the fourth 

 foot now projects with its tuft of bristles, the anal segment 

 remaining as before. The final cirri spring close together 

 on the ventral surface, and extend backward as short sub- 

 ulate processes, their total length being about the transverse 

 diameter of the anal segment. They present no bulbous base 

 .as in Greef s species, and differ from the stumpy conical 

 condition shown throughout all the stages of Reibisch's 

 examples. 



Greef's * specimens were procured in the Bay of Arrecife, 

 Canary Islands, from January to May. The body had fifteen 

 segments and was 3 mm. in lengtii. Tiie head and first seg- 

 ment had a reddish tint, the lounded reddish-brown eyes, 

 situated a little beliind the bases of the dorsal tentacles, had 

 lenses, whilst the mouth opened at the tip of the snout. On 

 each side of the posterior part of the head is a ciliated, 

 lobate, nuchal organ. The first segment bears a pair of 

 rather long cirri and a setigerous process ; the second has 

 shorter cirri, but the third, again, has somewhat longer cirri, 

 and they get broader posteriorly. The bristles borne by the 

 setigerous process have straight shafts, a bifid spur with a 

 longer and a shorter sharp process, and a serrated terminal 

 process with the spikes directed distally. He describes a 

 dorsal vessel, as in Pontodora, ii\ ripe examples, which has 

 either ova or sperms. The alimentary canal has a muscular 

 pharynx with a glandular (?) central region. He was 

 uncertain as to the position of the species, but thought it 

 might be near the Syilids. 



Vignierf (1886) found the same form in the Bay of 

 Algiers from December onward throughout the year. He 



* Zeitsch. f. w. Zool. Bd. xxxii. p. 247, Taf. xiv. figs. 23, 24, & 25. 

 t Archiv Zool. Exp6r. 2 s6i-. t. iv. p. 377, pi. xxi. tigs. 1-13. 



