190 Nelson on Tertiary 3Iollasca of Peru. 



Turritella, sp. ind. 



Shell elongated, turreted ; whorls broad and very concave ; sutures 

 indistinct. Surface just above each suture marked by a very strong 

 ridge. Intermediate surface marked by a few distinct concentric 

 lines, five to seven on each whorl. If the characters just given be 

 constant, this species is very distinct from any of tliose described 

 above, and from any now living on the West Coast. It is perhaps most 

 nearly related to 2\ bifastigata Nelson, but has the whorls more concave 

 and lacks one of the bordering ridges. Only four specimens of this 

 species were found, all so badly worn and covered by Bryozoa and 

 Serpulse that it is impossible to give a more detailed description. 



Eight Avhorls measui*e : length 63*4 millim. ; breadth 19"4 millim. ; 

 breadth (basal, along the ridge) 26*2 millim.; breadth of upper whorls 

 5 '6 millim, 



Aphera Peruana, sp. nov. 



Plate VI, figure 3. 



Comp. Cancellaria tessellata Sby., Proe. Zool. Soc. Lond., 1832; Kiener, Iconog., p. 32, 



pi. 9, fig. 4. 

 Aphera tessellata Adams; Chenu, Manuel Conch, et pale., ii, p. 276. 



Shell elongated, sub-fusiform ; spire short, pointed, formed by five 

 or six moderately convex whorls. Body whorl large, three-fourths 

 the length of the shell, ventricose. Surface marked by nearly equal 

 longitudinal and transverse ridges, which form strong raised cancella- 

 tions, and are so arranged as to form blunt, obtuse granulations at 

 the point of contact. 



Longitudinal lines finer, and much crowded near the outer lip. 

 Aperture oblong-oval, narrow, half as long as the shell. Lips covered 

 with callus, which is continuous above and below the aperture. Callus 

 of columella lip strongly reflexed over the shell, much broader above 

 than below, almost completely covering the umbilicus. Outer lip 

 thick, and reflexed above, furnished within with a few rather strong 

 teeth. Inner lip with two plaits near the center, the upper one being 

 much the stronger. There is also a plait at top of the lij), small 

 but quite distinct. Canal wanting. Aperture prolonged into a short, 

 open sinus. Length 17*4 millim. ; length of spire 4*4 millim. ; breadth 

 10 millim. 



This species closely resembles Aphera tessellata Adams, but is dis- 

 tinguished from that species by its less slender form, stronger cancel- 

 lating ridges, by its shorter and more open apertui*e, and by the third 

 fold at the top of the columellar lip. 



