NATICA. 97 



iimbilicum tumida; tenuiter imilobata. — Fawn-coloured, with 

 a more produced spire than N. monilifera ; a rather large 

 umbilicus. The columella is rounded and thick, formed into 

 a slight lobe over the upper part of the umbilicus. 



131. MELANOSTOMA, f. 72, Lamavck. — Ovata pallida, maculis 

 castaneis trifasciata ; spira brevi, anfractibus superne declivi- 

 bus turn expansis ; apertura magna, subpyramidata, umbilico 

 angusto partim obtectoj castaneo-nig'rescenti, columella late 

 reflexa callosa nigra. — One of the sigaretus-like species, with 

 wide and high aperture and short spire. It has a black 

 callous columella, broad over the narrow umbilicus. 



132. ZANZEBAKiCA, f. 73, Recluz. — Quam N. 7)ielanostow,a 

 latior, spira brevissima, apertura maxima, ultimo anfractu 

 angusto, sparsim castaneo maculato. — Broader and more open- 

 mouthed than N. melanostoma, with narrow body-whorl. 



133. MELANOSTOMOiDES, f. 78, Quoy. — Parva, quam N. 

 zanzebarica tenuior, magis acuta, et obliqua, umbilico et 

 columella augustissimis. — More thin and succinea-like than 

 the other species of the group, with- a very narrow umbilicus 

 and thin oblique columella. 



134. siMi^, f. 71, Chemnitz. — N. zanzeharicce similis, sed 

 magis regulariter ovata, fasciis griseis undulatim castaneo 

 eleganter strigatis et maculatis, columella nigrescenti-castanea 

 ad ultimum anfractum magis expansa. — Like N, zanzebarica 

 in form, but more regularly oval, very smooth, with bands of 

 grey purple, on which chestnut spots and zigzag markings 

 are ornamentally arranged. 



1 35. Seb^e, f. 79, Souleyet. — Subpyramidata, pallida, tenuis, 

 infra inflata, spira producta, anfractibus subinflatis, ultimo 

 late iuflato ; apertura magna, infra subquadrata ; columella 

 rectiuscula, purpurea, umbilico angusto. — More inflated than 

 others of the same group ; pale, with bands obscured by a 

 dull grey epidermis. 



136. MACKOTEEMis, f. 148, Aclams and Reeve. — Alba lavis 

 oblique ovata, umbilico maximo, apertura angusta, alta, 

 columella rectiuscula vix lobata.— A white shell approximating 

 to the above group, but very oblique, with narrow elevated 

 aperture and very wide umbilicus. 



