PLACOSTYLUS, NEW ZEALAND. 23 



de Conchy]. 1853, p. 404. CROSSE, J. de C., 1864, p. 124 (with 

 var. Candida). PFEiFFER,Monogr. vi, p. 82 ; viii, p. 118. HECTOR, 

 Catal. Land Moll, of N. Z. p. xx (1813) Placostylus bovinus Brug., 

 MARTENS, Critical List of Moll, of N. Z., p. 13 (1873) ; Monatsber. 

 K.-P. Akad. Wiss. Berlin, p. 279. BUTTON, Man. of N. Z. Moll., 

 p. 14 (1880) ; Trans. N. Z. Inst. xiii, p. 200 (teeth); xiv, p. 152, 

 pi. 4, f. K, pi. 3, f. D (radula), pi. 3, f. o (jaw), 1882 ; Tr. N. Z. 

 Inst. xvi, p. 190 (1884). HEDLEY & SUTER, Proc. Linn. Soc. N. 



S. Wales (2), vii, p. 632 (1892) SUTER, Journ. de Conchyl. xli, 



1893, p. 236. KOBELT, Conchyl. Cab., Placostylus, p. 36, pi. 9, f. 

 1 Bidimus auris-bovina PETIT, Journ. de Conchyl. 1853, pp. 403- 

 405 CROSSE, Revue Zool. 1855, p. 82. 



Allied to P. bivaricosus of Lord Howe's Island, and P.fibratus of 

 New Caledonia. The former differs in the distinctly truncate base 

 of the columella, lack of a light subsutural border, flatter lip, etc.; 

 P. fibratiis has a strong columellar fold and a differently formed lip 

 and columellar margin. 



The type of P. shongii was taken by Gabert " at the cascade of 

 Kiddi-Kiddi, under the trees bordering the river of the same name," 

 in the neighborhood of the Bay of Islands.- It was named after a 

 celebrated chief of that region. Figure 6 represents a typical speci- 

 men, the upper and basal tubercles being well developed, and the 

 lateral callus smooth. In some other shells, apparently quite mature, 

 the teeth are obsolete and the callus very low (fig. 7) ; while others 

 have the callus very strong and beset with low tubercles (fig. 5). 

 In immature shells the lip is of course thin and merely expanded, 

 and the rich color of the mouth is wanting. Two varieties are ad- 

 mitted by Professor Hutton and Mr. Suter, but their status is rather 

 uncertain. 



M. Petit de la Saussaye, in 1853, rejected the name shongii, pre- 

 viously in use for this species, in favor of that of bovinus or auris- 

 bovina of Bruguiere ; and he was followed by Crosse, Pfeiflfer, and 

 all modern students. By the terms of Bruguiere's description, as 

 well as by the figures he cites (to which, however, I attach no great 

 weight), it is impossible that he could have had the present shell 

 before him. He states that in B. bovinus the length of the aperture 

 is half that of the shell ; the columella has a single quite projecting 

 fold, placed obliquely, etc., all of which applies to P.fibratus but not 

 to P. shongii. Bruguiere refers to an illustration in Lister (pi. 1058, 



