824 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxhi. 



LORIPES CLAUSUS Philippi. 



1 have some doubt a.s to the oritiiiiiil liut)it:it of this species, as a 

 vessel having West African ballast seems to have been wrecked at 

 Belize, and the Rev. W. A. Stanton collected several dead shells which 

 appear to have come from this ballast, and it is possible this should be 

 included among them. It was originally described with no habitat. 



PHACOIDES (LUCINOMA) FILOSUS Stimpson. 



(Plate XL, fig. 11.) 



The general confusion which has reigned for some time in regard to 

 the Lucinoids of the group typified by this species, and of which 

 Lucioia Ijorealh Linna3us is a peripheral form, has led to a ]iuml)er of 

 misidentifications ])y the writer, as well as by Cooper, Carpenter, and 

 others, in the past. The Pacific coast form is so near to filoHu^ that 

 when it was not identified with Z. horealisovthe Miocene fit ultil in eaft/.s 

 the name given l)v Stimpson to the New England form was almost 

 alwa3^s applied to it. Though there is quite a range of variation in 

 these species, they can invaria])ly be separated by the characters of the 

 deep, narrow sulcus in which the ligament lies. In P. f/fjsui^ the s'ldea 

 of this sulcus rise perpendicularly on each side of the ligament, form- 

 ing a high keel, and the sides of the lunule show this in a less, l)ut still 

 a noticeable, degree. In P. a?inidatifs, on the other hand, the top of 

 the ligament is as high or higher than the sides of the sulcus in which 

 it lies, and the lunule is similarly shallow. The po.sterior dor.sal margin 

 in JiloKii.s is generally more arcuate, Init this is not an invariable char- 

 acter. In order to illustrate the comparison, figures are given of the 

 interior of a valve of each. In the figure given in Proc. U. S. Nat. 

 Mus., XIII, 1890, pi. XVII, fig. 5, l)y an error of the draughtsman the 

 anterior adductor scar is incorrectly represented as short. The cor- 

 rect proportion is shown in our present figure. 



PHACOIDES (LUCINOMA) ANNULATUS Reeve. 



(Plate XL, fig. 10.) 



See remarks under the preceding species. The present figure is 

 from a specimen collected at Clayoquot, Vancouver Island, measuring 

 alt. 50, Ion. 58, and diameter 19 miiL It is a curious fact that the 

 Miocene P. eontractiiH Say more closely i-esembles the Pacific coast 

 recent shell than it does the living species of the adjacent Atlantic 

 coast. 



PHACOIDES (CALLUCINA) RADIANS Conrad. 

 (Plate XLII, fig. 8.) 



Conrad's figure of this species' is very poor, and the identification 

 depends upon his specimens rather than his illustration. The same 



^Fossils of the Medial Tertiary, 1845, pi. xl. 



