306 ESCHARID^E. 



in plate Ixxviii. fig. 2, of the ' Catalogue/ which has a 

 depressed subquadrangular cell, and a sinus on the lower 

 lip. Norman conjectures that this figure, as well as 

 fig. 1 on the same plate, may have been drawn from 

 specimens of his Hemeschara sanguined. This is not 

 improbable; but at any rate they cannot, I think, be 

 referred to L. pertusa. 



The tubercle below the mouth is occasionally replaced 

 by a well-developed mucro. The avicularium seems to be 

 very sparingly developed, and has hitherto escaped notice. 

 When old and strongly calcified, the cells are covered 

 with a thick network of stone. 



HABITAT. On shells, stones, &c. from shallow to deep 

 water. 



LOCALITIES. Isle of Man (E. Forbes) : Cornwall (C. W. 

 P.) : South Devon, very common ; off the Deadman, 

 40 fathoms ; Guernsey (T. H.) : Tenby (F. Walker) : 

 coast of Antrim, deep water ; off Sana Island (Hynd- 

 man) : Orkney (Lieut. Thomas) : Shetland, "on shells, 

 especially Ditrupa, and stones, 40-100 fathoms " (A. 

 M. N.). 



GEOGRAPHICAL DISTRIBUTION. Adriatic, common on 

 stones, mussels, and Algae (Heller) : Lussin Island, 9-10 

 fathoms (Grube) : Australia (Macgillivray) : New Zea- 

 land, on shells and coral (F. W. Hutton) : Fiji and 

 Samoa Islands (fide Kirchenpauer) : Anticosti and Min- 

 gan Islands ; South Labrador (Packard) : Florida, 60 

 fathoms (Pourtales) : Mazatlan, on Murex bicolor (T. 

 H.) : Greenland (North German Polar Exped.) *. 



* I give some of these localities with a certain measure of doubt. There 

 seems to have been some difficulty in identifying L. pertusa. The form 

 from the Italian Pliocene deposits and from the Mediterranean, figured by 

 Manzoni under this name, is certainly not the present species, but is 

 referable to Schiioporella sanguinea. 



