OF NEW SOUTH WALES. 59 



membrane on which they are placed, are colorless, transparent, 

 and glassy. No other molluscan animal, as far as I am aware, 

 has the odontophore coiled up at the back of the mouth. 



The shells of the Littorince are for the most part like the 

 typical species, the common perry-winkle of Europe ; that is to 

 say they are elongately turbinate with, rounded whorls almost 

 destitute of ornament. But there are some with tubercles and 

 granules upon the spire, and with flattened whorls and angular 

 base. These have been erected into other genera by dijBferent 

 authors, as I shall show presently, but at present I am regarding 

 as one genus all those shells which would come under the 

 definitions of Deshayes with regard to the shells and the animals. 



There is one peculiarity in some members of the genus to 

 which, as far as I am aware, attention has not been drawn by 

 any naturalist, and it is so very common and so peculiar that it 

 must have some relation to the animal economy. T refer to a 

 spiral white or yellow line which lines the interior of the shell, 

 and arises from the anterior aperture, or at the lower part of the 

 labrum or outer lip. I find this peculiarity on the following 

 members of the genus : — L. grandis (Sea of Ochotsk, Reeve), 

 Middenof ; L Africana, Philippi, Algoa Bay ; L. ziczac, 

 Chemnitz, Monte Christo, West Columbia, and South Australia 

 (Kangaroo Island ?) ; L. cincta, Quoy & Gaimard ; L. luctuosa, 

 Reeve, New Zealand ; L. neritoides, Mediterranean ; L. granularisy 

 Gray, Hab. ? ; L. striata, King, Canary Islands, ita Reeve ; 

 L. NovcB Zelandm, Reeve ; * L. Knysnoeensis, Krauss, Knysna 

 River, Cape ; L. grano-costata, Reeve, Brisbane ; L. Feejeensis, 

 Reeve, Feejee ; L. araucana, D'Orbigny, South America ; L. 

 nuauritiana, Lamk, described as Phasianella (= L, loevis, Reeve ; 

 L. diemanensis, Quoy & Gaimard, Chatham Islands ; L. unifasciata, 

 Gray, Tasmania and S. Australia) ; L. melanostoma (Risella 

 melanosto7na, Gmelin, nana Lamk. ; vittata and lutea aurata, 

 plana, striolata). 



I shall notice presently what I consider will throw some light 

 upon this curious feature. I now pass on to the manner in which 



* The name and the habitat are Reeve's, but no such shell is known in New Zealand, 

 See Journal de Conchyliologie, 1878, p. 26 . 



