246 AUTOLYTUS LONG1FEKIENS. 



posteriorly (De St. Joseph). Proven tri cuius reddish-orange, rather long, barrel-shaped, 

 and narrower anteriorly. It has forty to fifty-four rows of points (De St. Joseph). Foot 

 with a longer or shorter, slightly tapered, dorsal cirrus, a rather massive setigerous 

 process soldered to the rounded posterior mass, and bearing a series of somewhat short 

 bristles, which have short, deeply bifid terminal pieces, the base in front being so narrow 

 as to resemble a third tooth. Spine with a small mucro, and a single bristle with a short 

 delicately tapered tip is present. 



Reproduction by stolons (De St. Joseph). 



Synonyms. 



1886. Autolytus longiferiens, De St. Joseph. Ann. Sc. Nat., 7 e ser., t. i, p. 217, pi. x, figs. 95—97. 

 1908. „ ,, Elwes. Journ. M. B. A., n.s., vol. viii, p. 202. 



Habitat. — Between tide-marks, Oddicombe, Torquay (Major Elwes). 



Common in dredged material at Dinarcl, coast of France (De St. Joseph). 



Head fairly large ; four distinct eyes with lenses. The median and lateral 

 tentacles have the usual proportions. A central line indicates the palpi anteriorly. The 

 tentacular cirri are also normal, whilst the dorsal cirrus of the first bristled segment 

 agrees with that of A. ehbiensis in being the longest appendage of the kind. 



Body rather massive, from 10 — 20 mm. in length, and having from fifty-one to 

 eighty-eight segments (De St. Joseph), the British examples so far as observed being inter- 

 mediate in size. The dorsal cirri are of moderate length, and long and short alternately, 

 a condition met with in other forms; but, as De St. Joseph points out, the relatively 

 greater length of the anterior cirri is noteworthy, and the dorsal cirrus of the fifth 

 segment is longer than the third, whereas in Proceroea it is small (De St. Joseph). 

 Unfortunately the examples clo not afford information on these points. Posteriorly the 

 body terminates in two long and large caudal cirri. The general colour is orange. In 

 front of the proventriculus are three longitudinal reddish bands, the two lateral forming 

 " epaulettes " in the first two segments. 



The proboscis is remarkable for its great length, coiled condition, and slenderness, as 

 well as for the fact that its anterior edge has a crown of ten large obtuse teeth separated 

 by three smaller pointed teeth which terminate posteriorly in two spines (De St. Joseph). 

 Major Elwes, however, notes that the British examples have only two of the intermediate 

 smaller teeth instead of three, and this appears to be right ; but the French examples are 

 much larger, for the proboscis, instead of being only 2 mm. (Elwes), is from 18 — 20 mm. 

 (De St. Joseph) in length. The latter author agrees with Claparede 1 in defining three 

 regions of the organ, the anterior the most muscular. The reddish-orange proventriculus 

 is rather long and barrel-shaped, narrower anteriorly than posteriorly, and has from 

 forty to fifty-four rows of points (De St. Joseph). 



The typical foot (Plate LXXXVII, fig. 16) has dorsally the long and slightly tapered 

 smooth cirrus (long or short), a rather massive setigerous region soldered to the 

 rounded posterior mass, and bearing a group of somewhat short compound bristles which 

 have very short bifid terminal pieces (Plate LXXXVI, fig. 17), the curve from the second 



1 < Anuel. Nap./ p. 218. 



