SYLLIDEA (PROPER). 187 



Both have lenses, the specimen, moreover, showing in the anterior eyes a larger lens and 

 a smaller in front of it. The median and lateral tentacles are long, the former being 

 frequently carried backward. All have palpocils and "corpuscles brillants " (Marion and 

 Bobretzky). Tentacular cirri two pairs, the dorsal in each being as long as the median 

 tentacle. 



Bod}/ about 20 mm. in length, a little tapered anteriorly, more distinctly tapered 

 posteriorly, and ending in two caudal cirri. The pale body is marked by two touches of 

 orange on the first segment, by four on the succeeding, and has a series of minute 

 corpuscles often arranged as a transverse band anteriorly. The first dorsal cirrus is as 

 long as the median tentacle. 



Foot (Plate LXX, fig. 26) well marked, with a smooth dorsal cirrus about equal to 

 the diameter of the body, and the comparatively prominent setigerous region has the 

 form of a truncated cone, with two or three spines piercing the upper angle, each of these 

 having a modification of the tip, as in every case this is bent as well as blunt. The 

 bristles are slightly yellowish, and form a considerable group below the spines. The shaft 

 has a ventral curve distally (Plate LXXIX, fig. 26), is enlarged and bevelled, with 

 distinct spines along the convex (upper) border and peak, and a short terminal piece with 

 a single bold terminal hook. The concavity below the hook is crescentic, and an abrupt 

 edge bounds it inferiorly. The type of bristle thus differs essentially from that 

 characteristic of Autolytus, since that is bifid. Moreover, the ventral cirrus is free 

 distally, forming a broadly lanceolate process. 



Grube (1860), who did so much patient and excellent work in the group, first 

 described this form as a Sylline, as its frontal lobes (palpi) had coalesced, its cirri were 

 not articulated, and the ventral were altogether absent. His description, both in regard 

 to structure and colouration, is easilv recognized, though the ventral cirrus is not absent. 



Marion and Bobretzky fifteen years later (1875) published an account of the same 

 annelid under the title of Autolytus (Procersea) ornatus, as a new species. They gave a 

 good figure, but did not add much to Grube's original description. 



Langerhans (1879) found large examples of the same form at Madeira, and describes 

 the four dorsal touches as red, the lenses of the eyes as somewhat cylindrical, the pharynx 

 (proboscis) with thirty teeth, and the proventriculus with thirty rows of points. He 

 shows two kinds of terminal pieces to the bristles, viz. bifid and slender simple. So far 

 as can be ascertained, the former would appear to refer to the bristles seen on edge. 

 Females carried white and reddish eggs. 



Malaquin (1890) regards this species as synonymous with the Autolytus (Procersea) 

 ornatus, De St. Joseph, 1 a view adopted here. 



Group III.— SYLLIDEA (PROPER). 



Syllida? provided with ventral cirri. Palpi free throughout their entire length. 

 Tentacles and cirri moniliform, as if of independent articulations. Reproduction by 



1 ' Ann. Sc. Nat./ 1885, p. 220, pi. x, figs. 98—99. 



