POLYCHJETA sedentaria of the firth of forth. 637 



Nerine foliosa, Sars. Malmgren also expresses a doubt as to the identity of 

 the coniocephala of Johnston with the folosia of Sars. We can find no reason 

 for this uncertainty, as the description and figures of Johnston obviously agree 

 with the description given by Sars of. folosia. 



Specific Characters. — The colour in the living animal is yellowish, the 

 branchiae being red, from the presence of pseudhsemal vessels, and the posterior 

 part of the body having a green colour, due to the intestine seen through the 

 body-walls. 



A broad lamina extending along the whole length of the branchial filament 

 in the anterior somites ; posteriorly the lamina extends a less distance along 

 the branchia, leaving an increasing distal portion free. The size is large, full 

 grown specimens being over 6 inches long and \ inch broad; it is much larger 

 than the following species. 



Habits. — This worm is found at Granton burrowing in a stiff grey underclay, 

 containing carbonised plant stems : it occurs in the littoral zone, and probably 

 beyond it, at a depth of about 1 foot in the clay. It is also sometimes found 

 under stones resting on muddy sand. When uncovered and placed in water, it 

 is unable to crawl, but simply writhes and contorts itself, sometimes with great 

 violence, and often breaks itself into pieces. 



Anatomy. — The nephridia are not present in the anterior part of the body, 

 where the notopodial lamina extends along the branchia. In the posterior 

 segments the nephridium is lateral in position, on a level with the dorsal end of 

 the neuropodial fascicle of setse, and anterior to these. It consists of a spherical 

 vesicle with internal and external ducts, both short. It is ciliated internally 

 throughout. The internal duct passes through the mesentery in front of it, 

 and opens into the ccelom by a funnel-shaped opening. We have been unable 

 to find an actual aperture to the exterior, but the walls of the external duct 

 become continuous with the epidermic cell layer. This duct is short, and 

 passes horizontally forward from the vesicle, coming into relation with the 

 epidermis at a point situated within the constriction of body -wall which separates 

 adjacent somites. The ovary is a cellular mass attached to the dorsal side of 

 the nephridial vesicle. In the centre of the ovary is a pseudhsemal vessel, and 

 dorsally the cellular mass is produced into a flat band. 



Nerine cirratulus, Claparede (Delle Chiaje). 



Lambricus cirratulus, Delle Chiaje, M^m. su. gli. anim. s. Vert., iv. 196. 

 % Nereis foliata, Dalyell, Powers of the Creator, vol. ii. p. 155. 

 Nerine cirratulus, Clap., Ch^t. du Golfe de Naples, 1868. 



Specific Characters. — Ocelli 4, two on each side on the cephalic ridge 

 immediately in front of the base of the tentacles, forming a slightly curved 



