42 SCLEROCHEILUS MINUTUS. 



from the snout to the tail, the summit of each process giving exit to a fascicle of bristles 

 composed of two kinds, viz. numerous long, simple hair-like bristles tapering to a very 

 fine point, and a shorter bifid series (Plate CIII, fig. 5 6). The foot-papillaa are smaller 

 in front, and they are rudimentary on approaching the vent, whilst the anal and the first 

 segment are devoid of them. 



This is the Eumenia ebranchiata of Dr. Baird in the British Museum. 



Theel figures a papilla (1879, PL III, fig. 46 20 ) between the dorsal and ventral 

 divisions of the foot of Eumenia longisetosa, and Ash worth thinks this is a sense-organ. 



De St. Joseph 1 (1894) found a small form at Dinard, on the shores of France, which 

 he described as a new species, viz. Lipobranchius intermedins. 2 It resembled Sclerocheilus 

 minutus in size, and it would appear to have stout, simple, curved bristles in the second 

 segment, and the author thinks it an intermediate form. 



Genus LXXXVIII. — Soleiiocheilus, Grube, 1863. 



Head small, prolonged into a short tentacle on each side anteriorly, and close behind 

 are broad ocular bands which meet in front so as to form an angle A • On each side 

 posteriorly is a retractile nuchal organ. Body vermiform, elongate, rounded and some- 

 what fusiform. Buccal segment achsetous. Second segment with five or six large spine- 

 like bristles (besides "petites entremelees," De St. Joseph) between the dorsal and ventral 

 lobes, which have capillary bristles. From the lobes of the other segments proceed 

 both long simple capillary and shorter bifurcate bristles. Small lanceolate ventral cirri 

 only on the posterior segments. Tail terminated by four cirri. 



Grube (1863) in his generic description thought the ocular bands were horny pro- 

 cesses of the mouth, and not eyes. 



De Quatrefages (1865) simply followed Grube's description, and thus continued the 

 misapprehension regarding the ocular bands. 



1. Sclerocheilus minutus, Grube, 1863. Plate CIII, figs. 8 — 8b — bristles; Plate XCVII, 

 fig. 1— hook; Plate XCVI, fig. 15— hooks; Plate C, fig. 3— bristles. 

 Specific characters. — Head with two well-marked short tentacles and two brownish- 

 red ocular bands on each side, which by union in front form an acute angle. Body dull 

 brick-red, three quarters of an inch long, segments about 40—50, like Scalibregma in outline 

 and in skin, but the resplendent bristles are longer, and there is a series of foot-lobes, 

 which form shorter cones anteriorly, longer cones posteriorly. A ventral cirrus from 

 the twenty-second foot backward, which, at its longest, is about a third the diameter of 

 the body. From the second segment a transverse fascicle of strong bristles with gently 

 curved and tapered tips projects on each side. The feet elsewhere have rather long 

 simple golden iridescent bristles, and at their bases are the tips of a series of bifid forms, 

 one limb of the fork being longer than the other. Posteriorly are four or five slender 

 anal cirri. 



1 'Ann. Sc. nat./ 7 e ser., t. xvii, p. 113, pi. v, figs. 146-147. 



2 As this passes through the press Mr. Southern records this species (Asclerocheilus intermedins) 

 from the Clare Island district. < Proc. Koy. Irish Acad./ vol. xxxi, pt. 47 ; p. 137. 



