HuTTON. — On some Pulmonate Mollusca. 155 



teeth are 34-1-34, of which about 12 are laterals, and there are about 111 

 transverse rows. I have figured, from a Dunedin specimen, some of the 

 teeth on PI. III., fig. k. 



Oncjhidella patelloides. No jaw. Eadula is -17 inch in length, and 

 •1 inch in breadth at the posterior end, tapering to a point anteriorly. 

 There are 84 transverse rows of teeth, which form an obtuse angle of about 

 125°, salient anteriorly. (PI. IV., fig. r.) Teeth 130-1-130. The central 

 tooth is tricuspid, the median cusp with a short pointed cutting point ; the 

 side cusps with broad incurved cutting points. The laterals pass gradually 

 into the marginals ; they all have a single cusp bearing a blunt cutting 

 point. From the anterior end a curved process of the base projects for- 

 ward ; this is short in the rows near the centre, and gets longer toward the 

 margin. (PI. IV., fig. b.) 



BuLiMUs GEBBOSA, Qould fPhysa) ? These specimens were given me 

 by Mr. J. D. Enys, and came from the Broken River. The spire is very 

 short, the whorls are rounded, without any trace of keel; the columella 

 plait obsolete. The shells are olive green in colour, L '3 ; B '17. The 

 apex in all is eroded, but the whorls are apparently four. I am doubtful 

 whether this is Gould's gibbosa, but it may remain under this name for the 

 present, until the species are better known. 



Animal. The edge of the mantle is simple, and not reflexed over the 

 shell. Tentacles long and filiform, with a rounded lobe at their outer bases. 

 Eyes sessile at the inner bases of the tentacles. Foot short and rounded 

 behind, truncated and not expanded in front. Eostrum bilobed. PI. IV., 

 fig. V.) The animal is yellow-brown, minutely speckled with greenish 

 brown. It walks by jerks. The eggs are in transparent capsiiles attached 

 to stones, etc., usually three or four together, arranged in a single layer. 



Dentition. The upper jaw is simple, arcuate, and attenuated suddenly 

 at each end ; it is transversely striated. The lower jaw is membraneous, 

 soft, and yielding. (PL IV., fig. t.) The radula is -07 in length, and -03 

 in breadth ; it is parallel-sided and rounded at the anterior extremity. 

 There are 126 transverse rows of teeth, curved slightly forwards. (PI. IV., 

 fig. Q.) The teeth are 27-1-27. The central tooth has its base longer than 

 broad, and with parallel sides ; the reflected portion has a single cusp, 

 which bears two small cutting points, variable in shape and size. There 

 are about ten laterals on each side ; they have a single cusp, which bears a 

 tridentate cutting point. In the marginals the cutting point has numerous 

 denticulations, and the reflexed portion gets longer. (PI. IV., fig. c.) 



The simple mantle margin, not reflected over the shell, and the sinistral 

 twisting of the shell itself, would place this species in Bulimus; but the shell 

 is not elongated, the aperture is not narrow, and the foot is not dilated 



