PSEUDOMELANIA. 
241 
shorter whorls. Some of the specimens, such as the one figured, are apt to recall 
certain stages of Ps. Heddingtonensis. 
For distinction’s sake this maybe known as Pseudomelania pinguis,” and 
regarded as a wide variety of Ps. procera. 
178. Pseudomelania lineata, Sowerby, 1821. Plate XVIII, figs. 7 a, 7 b. 
1821. Melania lineata, Sowerby. Min. Conch., pi. ccxviii, fig. 1. 
1852. ? Chemnitzia lineata, A'Orbigny. Terr. Jur., ii, p. 43, pi. ccxxxix, 
figs. 4, 5. 
1852. — Noemaniana, d’Orbigny. Vol. cit., p. 40, pi. ccxxxviii, 
figs. 4, 5, 6. 
Bibliography, ^c. — There has been a twofold difiiculty in dealing with Melania 
lineata. First, in ascertaining what form Sowerby really intended ; and second, 
in discovering his reasons for the name adopted. In the footnote to Ps. procera 
this subject has been discussed. I would only further remark that Sowerby says 
the strim are very fine, regular, and elegantly bent to form the lip. This shows 
clearly that it was to the lines of growth and not to the spiral punctate structure 
he was alluding. 
Description : 
Spiral angle .... 18° — 20°. 
Height of whorl to width . . . 1 : 1’45. 
Length ..... 60 — 60 mm. 
Shell conical, subelongate. Whorls smooth and tumid throughout, the 
contraction in the upper part of the whorl being so slight as to be scarcely visible ; 
no keel or posterior margin. The number of whorls is from nine to twelve; in 
many specimens both linear and spiral structure is well seen. 
Relations and Distribution. — Ps. lineata may generally be distingished from 
nearly all varieties of Ps. procera and its more immediate allies by the small trace 
of turriting, and by the shortness and almost uniform tumidity of the whorls. It 
may be said, however, to inosculate with Ps. procera, through the var. minor, 
of which Ps. Normanniana, d’Orb., may be regarded as a still smaller variety. 
The type is from the ironshot Oolite of Dundry, which is believed to be in the 
Humphriesianus-zone, where the form is not uncommon. This species also occurs 
in the Humphriesianus-zone at Oborne, and a smaller variety almost identical with 
Ps. Normanniana is rather abundant in the Parhinsoni-zoue of Burton Bradstock. 
Colour-bands and blotches are seen in some of the specimens, but this feature is 
less common than in Normandy. 
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