H. BuUen Newton — Miocene Shells from Egypt. 211 



"wider and more prominent costee having a lamellar or funnel-shaped 

 structure. These larger costse are broader and less numerous on 

 the right or lower valve than on the left. 



Dimensions. — Height, 60 mm. ; length, 65 mm. ; diameter, 32 mm. 



Eemarks. — Only one example of this shell is in the collection, con- 

 sisting of a pair of fragmentary valves in situ,, though preserving no 

 dorsal characters of any moment and showing merely the slightest 

 indication of one of the lateral auricles. So worn is the specimen 

 that the asperities of the test are a good deal modified, the bases 

 only of the sharp elongate spines, so prominent a feature in recent 

 Spondyli, being present. It appears to differ from S. crassicostatus 

 in its rounder, more compressed valves and thinner test, and from 

 S. gcsderopus in the lower valve exhibiting no trace of a foliaceous 

 growth. It probably represents an intermediate form between 

 these two species, which with better material at hand might be 

 "worthy of a new specific name. The fragmentary shell figured 

 by Fuchs from Egypt corresponds in most details with the present 

 specimen. 



Horizon. — Miocene (Tortonian). 



Distribution. — Egypt : Siwa (Fuchs) ; no locality recorded 

 for this specimen. Coll. Geol. Surv. Egypt, No. 623, Box No. 21a. 



Genus AXINJEA, Poll. 



Testacea Siciliae, yoL i (1791), p. 32. 

 Type. — Area pilosa, Linnaeus. 



AXINiEA PILOSA, Linnseus, sp. 



Area pilosa, Linnaeus: Systema Naturae, 12th ed. (1767), vol. i, pt. 2, p. 1,143, 



Nos. 181, 182. 

 Pectuneiilus glyeimeris and F. pilosa, Searles Wood, " Mon. Crag Moll. England" : 



Mon. Palaeontographical Soc, 1850, p. 66, pi. ix, fig. 1 [pars). 

 Feetunculiis pilosus, Hoernes, " Foss. Moll. Tert.-Beck. "Wien " : Abhandl. k. k. 



geol. Eeichs., vol. iv (1864), p. 316, pi. xl, figs. 1, 2; pi. xli, figs. 1-10. 



Seguenza, " Form. Terz. Reggio (Calabria) " : Mem. R. Accad. Lincei, ser. iii, 



vol. vi (1880), pp. 282, 360. 



Description. — This is a suborbiculate, equilateral species, convex, 

 and substriated ; umbones incurved ; margin creuulated. Shell 

 closely related to Area glyeimeris of Linnaeus, though differing 

 from it in never departing from the regular or equilateral 

 condition ; that species being frequently oblique in shape. Searles 

 Wood combined the two under P. glyeimeris, but more modern 

 authors have treated them as separate species, a plan adopted on 

 the present occasion. 



Kemarks. — Two examples illustrate this species ; they are partial 

 casts showing remnants of the thick test in places. The more 

 perfect one has the valves in situ, and exhibits the longitudinal 

 striations together with a series of concentric growth-lines. On 

 the sides are prominent oblique ridges representing the inner 

 margins of the large adductor scars. 



Dimensions. — Height, 75 mm. ; length, 71 mm. ; diameter, 46 mm. 



Horizon. — Miocene (Helvetian). 



