STKES : NON-MARINE MOLLUSCA OF NORFOLK & PHILLIP IS. 141 



contained the animal. This was, however, so hard that it could only 

 be extracted in pieces, soaking in diluted caustic potash solution 

 not having the desired effect. During that operation the jaw was 

 lost, but there can be little doubt that the species is oxygnathous. 

 Two embryonic shells were extracted. The foot has a parapodial 

 and indistinct diagonal grooves ; a caudal pore is present ; the sole 

 is tripartite. The radula (PL XIII, Fig. 19) has the formula 

 go-1 1-1-1 1- oo . The marginals on each side number about 100, 

 but it is difficult to count them exactly ; they are sinuate, slender, 

 bicuspid, the ectocone becoming smaller in proportion to the mesocone 

 as the laterals are approached ; the size of the teeth gradually 

 increases, and the base of attachment is high and narrow. There 

 are a few transition teeth of irregular shape. The laterals are 

 asymmetrical; the mesocone extends beyond the posterior margin of the 

 base, and there is no entocone in the sinuation of the reflexion. The 

 central tooth, long, narrow, and of the same size as the laterals, is 

 symmetrically tricuspid ; the mesocone also extends beyond the margin 

 of the base, and the side cusps are small but distinct." 



6. Fretum Grayi, n.sp. PI. XIII, Figs. 6 and 7. 



Testa obtecte umbilicata, turbinata, solida, lineis incretnenti bene 

 notata, nitidula, albido-cornea, fascia unica brunnea ad peripheriam 

 ornata ; anfractus 5 J, plano-convexi, regulariter lenteque crescentes, 

 ultimus basi impressus, sutura bene impressa ; apertura ovato-lunaris, 

 peristoma intus incrassatum, marginibus callo junctis, columellari 

 versus umbilicura dilatato, umbilicum omnino claudente. Alt. 18, 

 diam. max. 13 - 5mm. 



Hah. — Norfolk Island, found dead (coll. Brit. Mus.) ; Phillip 

 Island (coll. Brit. Mus.). 



Recalls F. Phillipii, Gray, but the present species is more elevated, 

 the suture is deeper, and there is a single brown baud in place of 

 a white zone. Its distinction from the preceding species has already 

 been pointed out. 



7. Rotula Campbellii (Gray). 



Helix Campbellii, Gray: Proc. Zool. Soc, 1834, p. 65; Reeve, Conch. 



Icon., Helix, sp. 438 and 765. 

 Rotula Campbellii, Gray : Semper, Reisen im Arch. Phil., Thl. ii, 



Bd. iii, p. 40, pi. iii, fig. 25 ; pi. vii, fig. 2. 



Hah. — Phillip Island (Gray) ; Norfolk Island, under dead bark and 

 in rotten wood (coll. Brit. Mus.). 



Gray's type-specimen does not belong to the more usual form, but 

 has a white zone above the periphery. 



8. Medyla inscllpta (Pfeiffer). 



Helix insculpta, Pfeiffer: Proc. Zool. Soc, 1845, p. 129; Conch.-Cab., 



Helix, p. 243, pi. xxx, figs. 15-18. 

 Helix basiodon, Morelet : Rev. & Mag. Zool., 1866, p. 165. 

 Medyla insculpta, Pfeiffer: Suter, Proc. Malac. Soc, vol. iii (1899), 



p. 330. 



