l52 Transactions. — Zoology. 



This fine species is not uncommon near Dunedin. It nearly always has 

 obscure spiral grooves. In colour it is either horn-coloured, or irregularly 

 marked, or flammulated with red. There is a variety with membraneous, 

 deciduous ribs, which I suppose may be the P. j^ortia of Gray. The den- 

 tition of both is the same, and the membraneous ribs are easily removed. 

 If I am right in identifying this ribbed variety with P. 'portia, then Dr. 

 Gray's name will stand for both. There is a mucous gland at the posterior 

 end of the foot. 



Placostylus bovinus, Bncguiere. Jaw arcuate, attenuated at the ends ; 

 membranaceous, soft, transversely striated by infoldings of the membrane, 

 giving the jaw the appearance of being composed of many pieces. (PI. 

 III., fig. o.) 



Eadula '17 inch in breadth, and length about two and a-half times as 

 much, with about 140 transverse rows of teeth. These rows are nearly 

 straight, forming a very obtuse angle salient posteriorly. (PI. IV., fig. k.) 

 Teeth 55-1-55, of which 28 are laterals. The central tooth has a single 

 cusp with rounded shoulders at its base ; the cutting point is short and 

 broad ; the base of attachment broadens posteriorly and does not extend 

 as far as the apex of the cutting point ; the lateral teeth are bicuspid, with 

 the outer cusp small ; there is no cutting point on the interior cusp near the 

 central tooth, but at about the twelfth row a small cutting point appears ; 

 this gets larger to No. 20, then smaller again, disappearing in the marginals 

 altogether. At about the fortieth row the central cutting point disappears 

 also. (PI. III., fig. D.) 



The specimen from which the drawings were taken was given me by 

 Professor T. Jeffery Parker, and had originally come from the north part of 

 the Auckland district. Although there is considerable difference in the 

 published descriptions of P. bovinus and P. novoseelandicus, I think that they 

 are the same species, as nearly every specimen that I have examined com- 

 bines characters of both. Usually they have the general form and colour 

 described as characteristic of P. novoseelandicus, together with the seven 

 whorls and the cherry-red mouth of P. hovinus. Although the shell has 

 seven whorls, the animal has only three and a-half whorls. 



Daudebaedia novoseelandioa, Pfeiffer. (?) The animal has no locomo- 

 tive disc, but a specimen long preserved in spirit showed a central longitu- 

 dinal groove on the foot. There is no jaw. Teeth 15-0-15. There are 

 about 35 transverse rows of teeth, which form an obtuse angle of about 

 100°, salient posteriorly. (PL IV., fig. m.) The breadth of the radula is 

 •16 inch, and its length about three times as much. Teeth aculeate, with 

 a central process of attachment. The apices of the teeth belonging to the 



