294 NEREIS SCHMARDiEL 



could only be examined as far as the thirty-fourth or thirty-fifth. In this region 

 considerable elongation of the lobes has occurred, whilst the depth of the foot from 

 above downward has increased. The dorsal cirrus reaches to the end of the dorsal 

 lobe, which is lanceolate. The superior setigerous lobe has an anterior elongated 

 papilla soldered to it inferiorly. The lamella beneath is shorter and broader than 

 the dorsal. The inferior setigerous process is irregularly conical and bifid, a flap 

 being in front, and the shorter tip behind. The ventral lamella is short and lanceolate. 

 The ventral cirrus is small and projects from an elevated boss. The bristles by-and-by, 

 as at the thirty-second foot, show only the series with the long tapering tips dorsally ; 

 whilst ventrally are (1) two upper powerful bristles and a group of those with long 

 tapering tips only a little shorter than the dorsal, followed (2) by a ventral series, 

 all of which, with the exception of the two upper, which have long tapering tips, have 



falcate tips. 



In an epitokous female from St. Vaast, kindly sent by the late Prof. Grube of 

 Breslau, and much distended with nearly ripe eggs, the changes in the feet begin about 

 the thirty-second and thirty-third in the form of a process or rudimentary lamella behind 

 the inferior setigerous lobe. At the thirty-fifth foot a small vertical lamella appears 

 inside the dorsal cirrus, a considerable flap projects behind the inferior setigerous process, 

 and the ventral cirrus has a small outer and a larger internal lamella. The parts increase 

 in complexity until about the sixty-fifth foot (Plate LXXII, fig. 2 b) ; the fan-shaped 

 lamella on the ridge of the foot forms a leaf-like process, the dorsal cirrus extending 

 from its outer border beyond the tip of the dorsal lamella beneath. The latter is a long 

 lanceolate process. A dense group of swimming bristles (Plate LXXXI, fig. 2 e) is borne 

 by the superior setigerous lobe with which the lamella below appears to be fused. The 

 inferior setigerous lobe also carries a dense group of swimming bristles and the large 

 foliaceous expansion behind. The spatulate ventral lamella projects from its lower 

 border, and the ventral cirrus has a narrow lamella at its outer and a large fan-shaped 

 lamella on its inner edge. 



The whole foot is largely distended by the ripe eggs, which escape on rupture of the 

 thinned integuments. The imperfect preservation of the specimen still further adds to 

 the distortion of the soft tissues of the foot, so that the drawing, like that of De St. Joseph, 

 might be improved. 



The segmental organ has its trumpet fringed with more irregular lobes than in 

 N. cultrlfera (to judge from the figure) and also furnished with long cilia (Goodrich). 



In the form of the anterior feet this species shows certain resemblances to N. 

 Marionii, Aucl. & Edw., but it diverges in the structure of the posterior feet. The 

 specimen from the Channel Islands is an epitokous female, partially developed, the ova 

 being about one-third grown. It has a dark speck on the ridge near the dorsal cirrus 

 for twenty segments, viz., from the eighth or ninth foot backward. 



In the British Museum, in a tube labelled " Tube of Venusia from the coast of 

 Cornwall," is an example of this Nereid. The tube is composed of coarse sand, stones, 

 and shell-gravel, and has little secretion, so that it is more lax than that of Thelepus. 

 Bohn, in his recent paper on the movements of Annelids, considers this tube-dwelling 

 species very sensible to its surroundings, when free rapidly passing from the reptant 



