94 DB. W. BAIED ON NEW ANNELIDA AND GEPHTEEANS. 



These interesting questions may, it is hoped, yet be eluci- 

 dated, and the affinities of the animal determined. In the mean 

 time I have thought it best to bring forward the fact for the 

 information of zoologists and physiologists. 



DESCEIPTION OP THE PLATE. 



A, natural size of ova. B, C, young cuttles under a 2-m. object-glass (24 diam.). 

 D, an embryo, as seen under a 1-in. glass. E, F, arms (^ in.), showing the 

 rudimentary acetabula. 



Description of some new Species of Annelida and Gcphyrca in 



the Collection of the British Museum. By W. Baird, M.D., 



r.E.S., &e. 



[Read April 7, 1870.] 



ANNELIDA. 



1. Nephthts Maoandrewi, Baird. 



Body elongate, tapering towards the inferior extremity, which 

 terminates in one rather long seta. The sides containing the dorsal 

 feet strongly ridged across. Proboscis rather short and rounded. 

 SetsB of upper lobe of feet few in number and serrated near the 

 tip ; rather shorter and broader than those of ventral lobe, which 

 are numerous and not serrated on the edges. Colour of the 

 dorsal region, in the centre, of a pinkish hue- 

 Length about 6 inches. 

 Ilab. Coruna, B. M' Andrew and H. Woodward, JEsqs. 



2. Nephthts impeessa, Baird. 



Body of a yellowish colour. Dorsal and ventral regions 

 smooth, of a pearly, somewhat iridescent hue. Ventral surface 

 marked with a bluish impressed line in the centre. Head small ; 

 antennae indistinct. Proboscis rather long, cylindrical. Papillae on 

 the summit of it, round the mouth, rather large and fleshy, disposed 

 in a series of 12 on each side. Eeet on upper part of body small 

 and close-set, becoming larger and more separate as they de- 

 scend. Lamellae ovate. Setigerous lobe rather large. Superior 

 branchial process involute, large, twisted once and a half round. 

 Setae of setigerous lobe of three kinds : — one, short, curved at the 

 tip and beautifully and minutely jointed ; a second, simple, long, 

 and slightly serrated on the outer edge ; and the third, long, 

 compound, the edges of the appendage minutely toothed on the 

 edge, as is also the top of the shaft. 



This species resembles very much tlie Nephthys lonf/isetosa, 



