558 PILSBRY AND VANATTA 



CERITHIDEA MUTATA^sp. nov. 



(PI. XXXV, fig. I.) 



Shell turreted, thin,, black with a subperipheral reddish girdle ; 

 weathering to pale pinkish brown, variously clouded with dirty white. 

 Whorls 8 in the largest specimens, which have apparently lost two 

 or three ; very convex ; impressed, flattened, or a little concave below 

 the suture ; more or less carinate below the flattened subsutural band. 

 The last whorl is produced very little below. Sculpture of narrow, 

 close, curved ribs, a little more prominent below the subsutural im- 

 pression, absent on the base, often strengthened into a series of beads 

 or small knobs, strung along below the suture ; everywhere decussated 

 by low spiral cords separated by narrow grooves, and more or less 

 strongly developed on various individuals. Aperture irregularly oval, 

 the outer margin much more arcuate than the inner ; outer lip thin ; 

 base excised in a shallow, wide notch. Columella short, obliquely trun- 

 cate below. Length 14 mm., diameter 5.6 mm. From Tagus Cove, 

 Albemarle, in a salt tide-pool in a mangrove swamp. 



This species reminds one of C. tenuis Pfr. of the lagoons of the 

 Bahamas, having the same thin texture. It is probably related to 

 C. sacrata Gld., having fundamentally similar sculpture. It is evi- 

 dently a brackish water species. 



DRILLIA ROSEOBASIS sp. nov. 



(PI. XXXV, fig. 2.) 



Shell fusiform, turreted, rather solid, coarsely ribbed, the ribs white, 

 interstices pinkish-brown, the base pink or rose colored. Surface 

 glossy. Sculpture of sti^ong, rounded, longitudinal ribs, separated by 

 narrower intervals, ten ribs on the last whorl ; the narrow anterior 

 portion spirally striate, the ribs obsolete there ; three apical whorls 

 smooth and polished, convex. Subsequent whorls 7, convex, separated 

 by an undulating suture, the last tapering below. Aperture white 

 with a pink stripe or two within ; outer lip thin, arcuate, retracted in 

 a shallow sinus above. Columella convex, pink. Length 13.5 mm., 

 diameter 5.2 mm., length of aperture 5.5 mm. From Tagus Cove, 

 xA.lbemarle. A heavily ribbed, bright colored species, with shallow 

 sinus. 



DRILLIA ALBEMARLENSIS sp. nov. 



[(PI. xxxv.^fig. 3.) 

 Shell slender, turreted, brown, glossy. Sculpture of obliquely longi- 

 tudinal ribs curved backward along the anal fasciole. On the last 

 whorl these are rather small and irregularly developed, disappear just 



