160 EITSYLLIDEA. 



1. Miorostllis Marenzelleri, n.s. Plate LIX, fig. 9; Plate LXX, fig. 3— foot. 



Specific Characters. — Head smoothly rounded, with a slight lateral notch, behind 

 which is a short lanceolate tentacle and near it a lens — indicating at least one eye on each 

 side. Body about 3 mm. long, slender, and tapered towards the posterior end. Segments 

 about thirty. Proventriculus stretches over three segments. Foot has a small dorsal 

 cirrus. Setigerous lobe bluntly conical. Upper bristles have a slender tapering terminal 

 piece considerably shorter than in Exogone. The others have a short terminal piece with 

 a simple hook at the tip. 



Habitat. — Procured by the dredge in four to five fathoms in the Sound of Harris, 

 August, 1872. 



Head smoothly rounded and having a very slight lateral notch to indicate sub- 

 division. Just behind the notch is a short lanceolate tentacle on each side. Near this is 

 a lens, showing that in life at least two eyes are present. 



Body about 3 mm. long, slender, somewhat tapered towards the posterior end, and 

 marked laterally by the feet. The tail was injured. The bristled segments appear to be 

 upwards of twenty-eight. The proboscis seems to be indicated by a pale region com- 

 mencing behind a line between the tentacles and extending to the proventriculus. The 

 proventriculus is considerably larger than in the Exogone from Ireland, and stretches over 

 three segments. From this the canal passes backward to the tail. A more opaque central 

 region in front is probably the tooth in the proboscis. 



The foot (Plate LXX, fig. 3) has a small conical dorsal cirrus. The setigerous lobe 

 is bluntly conical. The upper bristles have a slender tapering terminal piece, considerably 

 shorter than in the Irish Exogone (p. 154). The others have a short terminal piece 

 after the fashion of Syllis, with a simple hook at the tip. The end of the shaft of these 

 bristles is dilated, shouldered, and bevelled. 



The condition of the single example is such that only an imperfect account of it 

 is possible. 



This genus is closely allied to Claparede's Pdedophylax, 1 in which a small dorsal and 

 a ventral cirrus are present. 



Group II.— EITSYLLIDEA, Malaquin. 



Syllidse provided with ventral cirri; palpi fused at the base only. Tentacles and 

 cirri filiform or cylindrical, presenting superficial constrictions, but not distinctly 

 articulated. Reproduction direct (epigamy). 



Malaquin separates the genera by the structure of the proboscis. Proventriculus 

 normal, ventricule (stomach) little developed. The epithelial coat is very fine and 



i c 



Annel. Nap./ p. 210. 



