ARICIA EDWAKDSI. 501 



ensued on the base of the old bristle. Another small example had only eighteen of these 

 ventral rows of bristles. Thus the number of the ventral rows seems to increase with 

 age. 



In a small specimen from 164 fathoms in the ' Porcupine ' Expedition of 1869 all the 

 bristles were pale yellow, and a few of the stout curved stumps occurred in the twenty- 

 second foot (Plate LXXVI, fig. 5 a) amongst the slender bristles, so that they may 

 occasionally be overlooked. 



Posteriorly towards the tail the blood in the various dorsal and dorso-lateral pro- 

 cesses, which in this region are proportionally long, gives a deep red colour to the parts. 



Most specimens consist of the anterior region only, so that they probably frequent 

 the sand or gravel. 



Reproduction. — Lo Bianco 1 found A. foeticla, Clap., ripe from January to June at 

 Naples. The eggs are of a greenish colour, and deposited in a cylindrical vermiform 

 mass of mucus. 



This was the type of Audouin and Edwards (1834) which Cuvier had procured on 

 the French shores, and their description and figures are for the most part good. 



De St. Joseph (1906) distinguishes between this species and A. Latreillii, Aud. and 

 Eclw., by the shorter anterior region in the latter, the smaller number of papillose 

 segments, and by the diminution in the number of papillee in each segment. 



2. Aricia Edwardsi, an. var. Plate LXXX VII, fig. 8 — foot. 



An injured specimen dredged in Busta Voe in forty fathoms by Dr. Gwyn Jeffreys 

 in 1868 offers certain distinctions which would appear to be specific. Thus, whilst in the 

 outline of the head and in the general aspect of the body, and in the commencement of 

 the branchiae on the fifth bristled segment, it agrees with A. Cuvieri, it differs in the 

 darker brown spinigerous rows anteriorly, in the length and slenderness of the papillae 

 behind the feet, in the conspicuous size and shape of the spine-like bristles of the ventral 

 row, and in the paucity and minuteness of the papillae which extend ventrally on the 

 segments. As in the majority of these forms, only the anterior and a portion (about 

 three quarters of an inch) of the succeeding region had been secured by the dredge. 

 The head is a short acute cone, and the frilled proboscis projects ventrally from the 

 peristomial segment. The anterior region consists of twenty-one segments, the ventral 

 rows being dark brown, and the last four or five very small. At the tenth foot (Plate 

 LXXXVII, fig. 8) the subulate dorsal cirrus is rather more elongate than in either A. 

 Cuvieri or A. Latreillii, and the bristles consist of a longer inner (i.e., next the median 

 line) and a shorter outer series of tapering spinous forms. After a considerable interval 

 a long papilla somewhat enlarged at the base occurs to the exterior. It is accompanied by 

 a very powerful and nearly straight spine with a sharp tip, followed by the dark-brown 

 series, some of which are curved at the tip as in the previous forms but far stronger, and 

 moreover they show that the tips are not serrated. The smallest forms are at the extreme 



1 < Mitth. Zool. Stat, Neap./ xiii, p. 484. 



