LIMN^EA. 115 



greedy animal none of which are amiable qualities in 

 our own species ! Owing to the nature of its habitat, 

 the shell is apt to have a coat of hardened mud. The 

 whorls are sometimes more or less distorted or scalari- 

 form. Draparnaud says that the animal has only two 

 aeriferous tubes, instead of four as in L. auricularia; but 

 this remarkable and anomalous organization does not 

 appear to have been observed by other naturalists. 



This species differs from all the preceding in the shell 

 being thicker and the whorls much more narrow. It 

 was first (and well) described by Lister. 



Mr. Bean was kind enough to give me specimens of 

 L. cornea (a native of the North-American lakes) which 

 his son was said to have collected in the West of Ireland. 

 It is allied to the present species, through the variety 

 tincta ; but I suspect there must have been some mistake 

 as to the alleged Irish locality. 



7. L. TRUNCA'TULA*, Miiller. 



Buccinum truncatulum, Mull. Verm. Hist. pt. ii. p. 130. Limnwus 

 truncatulus, F. & H. iv. p. 177, pi. cxxiv. f. 3. 



BODY dark brown or grey, of a lighter colour on the lower 

 side, covered with fine black specks : tentacles short, but 

 slender, rounded at their tips : eyes nearly sessile : foot 

 rather short, marked witli milk-white spots, which are 

 scattered and larger than the black specks, nearly truncate 

 in front, gradually narrowing and abruptly rounded behind. 



SHELL oblong-conic, turreted, rather solid for its size, 

 glossy, yellowish-brown or horncolour ; sculpture the same as 

 in the two last species : epidermis thin : whorls 5-6, rounded 

 and convex, but compressed in the middle, so as to make the 

 top of each appear somewhat truncate ; the last whorl occu- 

 pying about three-fifths of the shell : spire abruptly tapering 

 to a rather fine point : suture extremely deep : mouth oval, 

 scarcely contracted on the inner side : outer lip sharp : inner 

 lip continuous with it and reflected on the columella, behind 



* Slightly truncate. 



