436 MANUAL OF THE MOTLUSCA. 
Shell when young free, equivalye, Anodou-shaped, with a long 
and prominent ligament, and two adductor impressions; adult 
irregular, inequivalye, attached by the right valye; umbones 
elongated, progressively filled up with shell, and forming an 
irregular ‘‘talon”’ in front of the fixed valve; epidermis thick; 
ligament in 2 marginal groove; interior pearly, muscular 
Fig. 222. Mullerva lodata, Fér. (Original.) 
impressions single, posterior. Fig. 222 represents the left, or 
attached valve, showing the single muscular impression, and 
projecting spur with the nucleus, consisting of both valves of th. 
fry, united, and filled. up with shell.* 
Distribution, River Magdalena, near Bogota, New Granada. ; 
Mr. Isaac Lea kas determined the identity of Milleria and 
Awstea by examination of Férussac’s type, and the suite of 
specimens, of different ages, in the collection of M. D’Orbigny.t _ 
SzcTIon B.—SIPHONIDA. 
Animal ‘with respiratory siphons; mantle-lobes more or less 
ynited. 
a. Siphons short, pallial line simple; Integro-pallialia. 
* M. D’Orbigny very liberally placed his suite of specimens of this remarkable 
genus in the British Museum. Oct., 1854. 
' Tho onty spevimen of Milleriain England, prior to the acquisition of the D’Orbigny 
coll-ction, was purchased many years ago by Mr. Thomas Narris of Bury, for £20. 
