LUTRARIA. 431 



" branchial") one is much larger than the other, and its orifice 

 is fringed with 30-40 fine cirri, one half of which are stronger 

 and longer than the intermediate cirri and fimbriated on each 

 side ; the terminal cirri of the excreta! tube are shorter and 

 equal ; tubular sheath covered with a brown epidermis : gills 

 narrow, pale drab : palps very large, triangular, pointed, of a 

 thin membranous texture, pale brown elegantly speckled with 

 minute red-brown points : foot large, fleshy, and white with a 

 tinge of pale brown. 



Shell scimitar-shaped, smaller than that of L. elliptica, 

 much broader with respect to its length, more convex, cylin- 

 drical, and solid, upturned at the posterior end, which is 

 rounded ; the anterior side is considerably shorter in propor- 

 tion ; the cardinal tooth on the anterior side in the right valve 

 is double, and there is no posterior lateral in either valve. 

 L. 2. B. 4. 



Habitat : In similar situations, but not so generally 

 diffused as the last species. It is rather common in the 

 Channel Isles, and has been taken on the coasts of 

 Dorset, Devon, Cornwall, and Ireland. It is said that 

 the late Mr. Lyons found it in Pembrokeshire ; and Mr. 

 Maclaurin included it in his list of shells from Cold- 

 ingham Bay, Berwickshire. Belfast " alluvial " deposit 

 (Hyndman and Grainger); Sussex tertiaries (Godwin- 

 Austen); Coralline Crag (coll. S. Wood in Brit. Mus.); 

 Subapennine strata (Brocchi) ; Monte Mario near Rome 

 (Lamarck) ; Sicily (Philippi). It has not been noticed 

 anywhere north of Great Britain ; but its distribution 

 southwards extends from Normandy to Lisbon, Nice, 

 and Algeria, its depth ranging from low-water mark to 

 12 fathoms. 



Although this species comes very near the last, my 

 iconoclastic propensities are not strong enough to unite 

 them at present. If their form is variable, and not to 

 be relied upon as a mark of distinction, the dentition of 

 each is somewhat different. I am not aware whether 



