38 THE NAUTILUS. 



been called Purpura saxicola Val. which is based on figure 4 of 

 plate 8, Voyage of Venus, 1846, which seems to represent Purpura 

 freycinetii Desh. 1839 (from Japan). The name Purpura emar- 

 ginata Desh. 1839, is based on the short spired rather rough sur- 

 faced form of this species. Purpura conradi Nutt. (MSS.), Smiths. 

 Misc. X, pi. 83, Tryon, Manual Conch. II, p. 175, seems to be this 

 form, from specimens received from Mr. Nuttall. Purpura fuscata 

 Forbes 1850, applies to the specimens with rather high spire and 

 many spiral costa, while Purpura ostrina Gld. 1852, is the small, 

 short spired, smooth form. 



Mr. J. G. Malone, of Portland, Oregon, having presented the 

 Academy of Natural Sciences of Philadelphia with a set of these 

 west coast shells, the preceding revision of the nomenclature was 

 undertaken. 



A NEW SPATHA. 



BRYANT WALKER. 



Spatha kamerunensis, n. sp. PI. Ill, figs. 1 and 2. 



Shell oblong-ovate, somewhat inflated, subsolid; beaks eroded, 

 but apparently only slighty elevated, sculpture not observed, placed 

 about ^ of the total length from the anterior end: anterior end regu- 

 larly rounded; basal and dorsal lines nearly parallel, slightly diverg- 

 ing posteriorly; basal line nearly straight, in some specimens slightly 

 arcuate; dorsal line straight or slightly curved; dorsal slope oblique; 

 posterior end somewhat prolonged and regularly rounded; posterior 

 ridge rounded, exhibiting in some specimens, a subobsolete angle, 

 terminating at the lower end of the dorsal slope; dorsal slope sculp- 

 tured with fine, radiating ridges, curving upwards towards the hinge; 

 surface of the disk subsulcate with strong lines of growth, cut by 

 very fine, impressed, radiating lines, between which the epidermis 

 is minutely and irregularly wrinkled or festooned; epidermis very 

 dark brown, almost black towards the margins; hinge edentulous; 

 beak cavity shallow, with a single, deep, dorsal cicatrix directly 

 under the beak; at the posterior end of the ligament, there is a tri- 

 angular notch in the dorsal border of the nacreous area; impressions 

 of the adductor muscles large, well marked, irregularly oval; that of 

 protractor pedis reniform, situated slightly behind and at the base of 

 that of the anterior adductor; posterior adductor impression large, 



