98 NATICA. 



137. FiLOSA, f. 74, Soiverby, MS. Mus. Cum. — Fulva, late 

 fusco fasciata, spiraliter tenuiter filoso-striata ; spira producta, 

 apertura lata, infra subquadrata ; columella rectiuscula nigre- 

 scenti, subtortuosa, umbilico angustissimo. — Of all the wide- 

 mouthed species of this group N. filosa most nearly resembles 

 N. succineoides, being narrow, with produced pointed spire, 

 with an outer lip rather square at the bottom ; but the 

 threaded sculpture distinguishes it. 



138. SUCCINEOIDES, f. 76, Reeve. — Parva, oblique trigona, 

 quam N. Tnelanostoma magis oblique trigona, immaculata, 

 umbilico angustissimo, columella obliqua, angusta, castaneo- 

 nigrescenti. — More oblique than the preceding, without spots, 

 and with the dark chestnut columella and umbilicus both 

 narrower. 



139. TJMBiLiCATA, f. 77, D'Orbigny. — Ampla tenuis oblique 

 ovata ; fulva, flammis castaneis undulatis trifasciatim ornata ; 

 apertura lata, columella tenui, obliqua, umbilico latissimo ; 

 spira brevi.— A small shell presenting an extreme form of the 

 open-mouthed species. It is ornamentally striped in three 

 bands with chestnut marks. The columella is oblique and 

 thin, and the umbilicus very wide. 



140. MACROSTOMA, f. 75, PkUippi. — Quam N. Sebce longe 

 magis inflata, tenuis, subrotunda ; apertura maxima lata, 

 infra rotunda. — Similar to N. Sebw, but more globose and 

 inflated. 



141. Priamus, f. 23, Recluz. — Quam N. maura magis 

 obliqua, medio anfractuum biseriatim punctata, ultimo an- 

 fractu supra umbilicum breviusculo, umbilico angusto elevato. 

 — Differing from N. maura in being more oblique, spotted 

 in two rows, with the body-whorl much shorter in front and 

 the umbilicus narrower and partly covered with a flattened 

 lobe. 



142. MAURA, f. 36, ^ru^mere. — Ovata castanea Isevis ; spira 

 brevi, pyramidata ; apertura maxima, subpyriformi labio 

 externo nigricanti, columella recta, nigricanti ad anfractum 

 ultimum expansa. — Shaped like others of the group, but more 

 evenly oval, with chestnut colour and nearly black colu- 

 mella. 



