rusus. 419 



back. The head is broad, the neck narrow, and the 

 tentacles hnear-Ianceolate and much flattened. The hinder 

 edges of the tawny-yellow operculum overlap its lobe 

 considerably. The male organ is lanceolate and falcate. 

 The axile denticles of the tongue are either obscurely or 

 not at all serrated below, the laterals have two small 

 serrations at their inner side, one large one outside. 



This species is distributed all round our shores, though 

 sparingly in the southern districts. It ranges from five to 

 eighty or more fathoms. A ventricose variety occasionally 

 occurs, and a very slender form has been taken by Professor 

 Macgillivray, off Aberdeen. It ranges from the British, 

 throughout the boreal seas, and along the coasts of North 

 America, from Massachusetts to Greenland. As a fossil, 

 it dates its British history from the coralline crag epoch, 

 and is abundant in the red crag. 



F. PROPiNQUTJs, Alder. 



Resembling the last, but the apex of the spire symmetrically 

 spiral. 



Plate cm. fig. 2, and (Animal) Plate S. S. fig. 1. 



Fusus corneus, var. pygmcBus, Gould, Invert. Massach. p. 284, f. 199 ? ? 

 „ „ „ Brown, Illust. Conch. G. B. pi. 6, f. 11, 12 ? 



„ Islaitdicus, hispid var. Howse, Ann. Nat. Hist. vol. xix. pi. 10, f. 5. 

 „ propinquus. Alder, Moll, Northumb. and Durh. p. 63. 

 „ (no name), Reeve, Conch. Icon. vol. iv. Fus. pi. 20, f. 82. 

 „ Sabi/ii (not of Gray), Forbes, Mem. Geol. Surv. G. Brit. vol. i. p. 25. 



" This species very much resembles F. gracilis (Islan- 

 dicus var, gracilis)^ but never grows to half the size, and 

 may readily be distinguished from it by an examination of 

 the apex. The nucleus of F. propinquus consists of two 

 or three small compact whorls, while that of F. gracilis 

 has only about a whorl and a-half, which are large and 

 rather produced at the top, giving the apex a mammillated 



