40 NEPHTHYS PANSA. 



inward and uncoiled, but the dorsal lamella is distinct. By-and-by only the dorsal cirrus 

 is visible, the branchia having disappeared. 



The anterior bristles (Plate LXXVI, fig. 15) are olive coloured, and have com- 

 paratively short barred tips, the widest part of the bristle being below the barred region. 

 The capillary bristles are short, the blade rather broad, flattened, doubly curved, and the 

 edge finely serrated (Plate LXXVI, fig. 14). 



There is some hesitation in identifying this form with Malmgren's, and the 

 condition of the specimen leaves room for further investigation. 



Parasitic Infusoria occur on the species both in British and Arctic waters. 



The Nereis incisa of 0. Fabricius x has no connection with this family, being a Nereis. 



So far as the figures and descriptions go, the Nepthys minuta of Theel 2 (1879) would 

 appear to be closely related to this form. Not even the presence of ova in the small 

 examples dealt with would lead to any other conclusion. 



The Nephthys atlantica of Hansen 3 (1879) is another form which resembles this 

 species. 



10. Nephthys pansa, Elders, 1875. 



Specific Characters. — Head as in allied forms (?). Anterior tentacles more slender 

 than the posterior. The long, massive, and dark-coloured proboscis has three or four 





Fig. 39.— Extruded proboscis of Nephthys pansa, Ehlers. After Ehlers. Enlarged. 



triangular papilla? in each of the twenty-two rows. Foot short and thick. The dorsal 

 division has a very slightly developed lamella. The cirrus and branchia arise from 

 the under surface of the division. The cirrus is short and conical; the branchia forms 

 a flat conical leaf. The bristles are dark. The inferior division is even shorter than 

 the dorsal. 



1 ' Skr. Natnrh. Selsk./ 5, p. 160, Tah. iv, f. 1—3, 1799. 



2 ' Annel. X. Zembla/ p. 28, Tab. ii, f. 18. 



3 < Nyt Mag./ 24, p. 6, pi. iii, fig. 1 and 2, and < Den Norske Nord-Exped./ p. 31, Tab. iv, f. 1—4. 



