EÜRYTIIOE ALCYONIA, 163 



is much thinner and shorter than the foregoing and ex- 

 tends only in some specimens to or a little beyond the 

 anterior margin of the cephalic lobe. There is a rather 

 thick , tongue-shaped caruncle , faintly lobated at its base 

 by five notches ; it extends only over three segments , but 

 in some individuals impinges a little on the fourth body- 

 ring. At the ventral side the cephalic lobe is divided by a 

 median groove in two wedge-shaped portions , with a rounded 

 frontal margin. The mouth is surrounded: in front by the 

 under-end of the wedge-shaped lobes , laterally by the basal 

 part of the 2'^'^ and 3rd segment, behind by the median 

 part of the anterior margin of the 4th segment. The buc- 

 cal segment does not participate in bounding the mouth- 

 opening, its basal part extending only to the middle of 

 the lateral side of the cephalic lobe. The anus is a longi- 

 tudinal fissure , between two flat walls , occupying the dor- 

 sum of five terminal segments; it has posteriorly a knob- 

 shaped papilla. The feet consist of two bristle-papillae , 

 separated by a rather large distance from each other; each 

 papilla is furnished with a strong cirrus. The dorsal cirrus 

 is somewhat longer than the ventral one , but does not 

 extend to the distal end of the bristle-tuft. The dorsal brist- 

 les are arranged in thick tufts, about as long as half the 

 breadth of the dorsum ; they consist of: a. a few stout , 

 simple , slightly curved bristles ; — b. a large group of slender 

 bristles with slightly bifid tip , one of the divisions being a 

 mere spur , while the other is extremely elongated and taper- 

 ing , about once and a half as long as the corresponding part 

 of the two slender ventral bristles ; they are faintly serrated , 

 but the serrations are so indistinct , that I first quite over- 

 looked them; — c. several stout, straight, harpoon-shaped 

 bristles , serrated on the edge ; — d. some slender , hastate 

 spines. The tips of the second type of bristles are white, 

 vitreous , the other bristles being horny-yellow, with a granu- 

 lated marrow , like in the hairs of mammals. The ventral brist- 

 les are bifid , the majority with short , stout tips , slightly en- 

 larged below the bifurcation , without any serration ; there 



Notes from the Leyden DMuseuui, "Vol. VIII. 



