436 MANUAL OP XHJR MOLLTTSCA. 



Shell when young free, equiyalve, Anodon-sliaped, v/itL. a long 

 and prominent ligament, and tT70 adductor impressions ; adult 

 irregular, inequivalye, attached by the right valve ; umbones 

 elongated, progressively filled \ip with shell, and forming an 

 irregular ** talon " in front of the fixed valve ; epidei-mis thick; 

 ligament in a marginal groove ; interior pearly, muscular 



Fig. 2£2. Mullena lobata, Fer. (Original.) 



impression? single, posterior. Fig. 222 represents the left, or 

 attached valve, showing the single muscular impression, and 

 l^rojecting spur with the nucleus, consisting of &o^A valves of tho 

 fry J united, and filled up with shell.* 



Distribution, Eiver Magdalena, near Bogota, New Granada. 



Mr. Isaac Lea has determined the identity of MUlleria and 

 Acostaea by examination of Ferussac's type, and the suite of 

 specimens, of diiferent ages, in the collection of M. D'Orbigny.t 



Section B. — Siphonida. 



Animal nith respiratory siphons ; mantle-lobes more or less 

 united. 

 a. Siphons short, pallial line simple; Integro-pallialia. 



* M. D'Orbigny very liberally placed his suite of specimens of this remarkable 

 genus in ihf British Masemn. Oct., 1854. 



( Tlio CBljr Bpei;im9n of Miilleriain England, prior to the acquisition of the D'Orbigny 

 coll -ct- OB, was purchased many years ago by Mr. Thomas Ncrris of Bury, for £20. 



