Button. —0« some Pulmonate MoUusca. l51 



cusp as well as the mediau has a cutting pouit. No. 6 is intermediate 

 between No. 7 and the laterals. Towards the margin the cusps get smaller 

 and the cutting points larger, but the outer side cusp never has a cutting 

 point. (PI. III. fig. A.) The teeth are arranged in nearly straight trans- 

 verse rows. (PI. IV., fig. G.) The specimen from which the drawings are 

 taken came from Dunedin, but I have found the same species at Queens- 

 town. There are 5-5^ whorls, and the ribs are less than •01 inch apart ; 

 the aperture is oblique. 



Patula hypopolia, Pfeiffer. The jaw is arcuate, not attenuated at the 

 ends, which are rounded ; it is transversely finely striated. It resembles 

 the jaw of P. igniflua, (PI. III., fig. m.) 



The radula is -02 inch in breadth, with about 133 transverse rows of 

 teeth; the rows are nearly straight. (PI. IV., fig. h.) The teeth are 

 26-1-26, of which 10 or 11 may be called laterals. The central tooth has 

 a prominent median cusp, with two minute side cusps : the base of attach- 

 ment is longer than broad, enlarging posteriorly, and extending far beyond 

 the median cutting point. The laterals are bicuspid with a cutting point on 

 each, the inner being the larger. No. 12 is also bicuspid, but the reflected 

 portion and the cutting ;points are very oblique. Towards the margin the 

 cutting points increase to fom-. (PI. III., fig. b.) 



This specimen is also from Dunedin, where the species is not uncommon. 

 Some specimens are entirely " horny- cinereous," as in the typical P. hypo- 

 polia, but some are slightly spotted, and others strongly spotted and marked 

 with rufous, thus passing into P. iota. Both forms are sub-carinated. The 

 peculiarity of the jaw in this species and in P. igniflua, is no doubt suffi- 

 cient to remove them from Patula ; but in the absence of full information 

 I make no attempt to place them properly. 



Patula igniflua. Reeve. The jaw is arcuate, with rounded ends, with 

 distant transverse striEe. It is membranaceous, soft, and pale horn-coloured. 

 There is no median projection. (PI. III., fig. m.) The striations of the 

 jaw appear to arise from folds in the membrane ; it gives the appearance of 

 the jaw being made up of many pieces slightly imbricated, but I could not 

 satisfy myself that they were really distinct. 



The radula is -03 inch in breadth, with about 70 nearly straight trans- 

 verse rows of teeth. (PI. IV., fig. i.) The teeth are 37-1-37, with 11 

 laterals on each side. The central tooth has a single cusp, surmounted by 

 a cutting point ; the base of attachment projects beyond the cutting point. 

 The laterals are bicuspid, but without a cutting point on the outer cusp. 

 The inner marginals are also bicuspid, but the cutting point is longer. The 

 outer marginals have the reflected part and the base of attachment much 

 reduced, but the cutting points are very long and sharp, (PI, III., fig. c.) 



