16 FLAMMULINA. 



Animal elongated ; mantle subcentral, included ; foot long and 

 narrow, reaching beyond the shell, rounded behind, slightly truncated, 

 and with a mucous gland situated under a caudal papilla (Hutton, 

 F. thaisa.) 



Jaw membranaceous, arcuate (F. thaisa) or horse-shoe shaped 

 (F. decidua, pi. 2. fig. 19), with broad imbricating plates. 



Dentition : central teeth narrow, with small reflection, the meso- 

 cone long; ectocones hardly visible. Lateral teeth with larger 

 reflection, the inner ones without side cusps, the outer tricuspid. 

 Marginal teeth in thaisa (pi. 2, fig. 21) multicuspid ; in decidua (fig. 

 20) first bicuspid, then tricuspid, rounded at the anterior margin ; 

 the outer 2 or 3 marginals are bicuspid. 



Distribution : New Zealand. 



F. celinde Gray, ii, 211. F. thaisa Hutt. viii, 70. 



F. Valeria Hutt. viii, 69. F. decidua Pfr. viii, 71. 



F. ophelia Pfr. ii, 211. F. traversi Smith, ii, 214. 



F. tamora Hutt. viii, 70. 



Subgenus PHENACOHELIX Suter, 1892. 



Phenacohelix SUTER, Trans. N. Z. Tnst. xxiv, p. 270. Fruticicola 

 HUTTON, olim, not of Held. 



Shell depressed, umbilicated, subdiscoidal, the spire slightly convex 

 orconoidal, periphery broadly rounded. Whorls finely ribbed, the 

 apical one smooth except for microscopic spiral strise. Aperture 

 lunate, the lip simple. Type F. pilula Rve., pi. 3, fig. 13. 



Animal elongated, the foot narrow, projecting behind the shell ; 

 mantle subcentral, rather anterior, included ; eye peduncles long, 

 rather clavate ; tentacles moderate. Hutton, from whose paper the 

 above description of the animal of F. granum is quoted, does not 

 mention a caudal mucous pore, but it is doubtless present. 



Jaw arcuate, with about 35 flat ribs which indent the concave but 

 not the convex margin (pi. 2, fig. 6, F. pilula.) 



Dentition : central tooth with small side cusps (F. granum) or 

 none (F. pilula) ; laterals similar, [lacking entocones. Marginal 

 teeth multicuspid, the inner cusp larger (pi. 2, fig. 7, F. pilula.} 



Distribution, New Zealand. The shell is very like that of Pha- 

 cussa but the marginal teeth differ widely. 



F. pilula Rve. ii, 212. F. granum Pfr. ii, 212. 



iota Pfr. F. chordata Pfr. 



