POLYCIEETA OP THE L.M.B.C. DISTRICT. 255 



cle Naples, 1868). This is so sculptured as to present the 

 appearance of a network of hexagonal meshes, each mesh 

 being a concavity. 



Diagnosis: — the first setigerous somite bears no 

 branchiae. The lamina extends, at most, little more than 

 half-way along the branchial process. In N. coniocephala 

 the lamina extends to the tip of the branchia in the 

 anterior somites. 



Nerine (Scolecolepis) vulgaris, Johnston. 



Hab : Port Erin and Southport. 



Plentiful in mud, under stones, at the former locality. 

 On none of the branchial filaments does the lamina extend 

 to the tip. The first setigerous somite bears branchiae, 

 thus differing from N. cirratulus. There appears to me 

 no sufficient reason for excluding this species from the 

 genus Nerine as Malmgren has done. I revert to 

 Johnston's nomenclature. 



Leucodore cilia ta, Johnston. 



Hab : Port Erin and Southport. 



A few were found living in narrow clefts in schist rock 

 near low water mark. Also in old shells. 



Family. — Magelonid^; (Cunningham and Ramage). 



Magelona papillicomis, Fr. Miiller. 



Hab : New Brighton and Southport. 



Found not uncommonly in sand between tide-marks. 

 The Mcea mirabilis of Johnston and Carrington. 

 Family. — Celetoptericle. 



Ch&topterus insignis, Baird. 

 Hab : Beaumaris (low water) ; and Turbot Hole off Puffin 

 Island (14 fins.). 



An excellent illustration, together with figures of the 

 various kinds of setae, is given in a paper by Mr. J. 

 Williams, published in vol. xviii of the Proc. of the Lit. 

 and Phil. Soc. of Liverpool, 1864. A number of Mr. 



