MUCRONELLA COCCINEA. 375 



is a complete cliange in tlie character of the sculpture, 

 and instead of mere granulation we have radiating and 

 slightly undulating furrows, which traverse with much 

 regularity the surface of the cell, and give it a singularly 

 elegant appearance. The ovicell is similarly adorned. 

 This kind of sculpture is not absolutely confined to this 

 variety ; it occurs in the Lepralia pteropora, Reuss, which 

 is undistinguishable in other respects from the ordinary 

 forms of M. coccinea^. 



Monstrosities. The following monstrosities have oc- 

 curred to me : — 



i. A cell, otherwise normal and fully equipped, with an 

 avicularium covering the oral aperture. 



ii. An avicularium with a quadrangular instead of a 

 pointed mandible, of equal width throughout, and squared 

 at the extremity. 



Habitat. On weed (chiefly Laminaria), rock, &c., 

 between tide-marks and in shallow water, and on shells, 

 Ascidians, &c., from moderately deep water (30 fathoms) . 



Localities, A very common littoral species. South 

 Devon; Ilfracombe; Guernsey; Isle of Man (T. H.) : 

 Cornwall (Couch and Peach) : Tenby (F. Walker) : 

 Hastings (Miss Jelly) : Isle of Wight (W. T.) : North- 

 vimberland and Dui'ham (Alder) : Ayrshire (Lands- 

 borough) : St. Andrews, rare as compared with southern 

 coasts (Dr. M'^Intosh) : the Minch ; Shetland, between 

 tide-marks and in shallow water (A. M. N.) : Belfast Bay 

 (W. T.). Var. mamillata, coast of Antrim (Hyndman). 



Geographical Distribution. BoscofF, very common 

 (Joliet) : France, S.W. (Fischer) : Adriatic, on shells and 

 Algse (Heller) : Norway (Sars) : Spitzbergen, on Asci- 

 dians, 16-30 fathoms (TorcU and Malmgrcn) : Greenland 



* Vide Mauzoni, Bi'joz. foss. Ital., Terza Coiitrib., pi. i. fig. 3. 



