136 HELCIONISCUS. 







Patella grata GLD., Proc. Bost. Soc. N. H. vii, p. 161 (Dec., 

 1859) ; Otia Conchologica, p. 115. 



This may be an Acmcea. It has not been figured, and I have not 



seen it. 



(4.) NEW ZEALAND AND AUSTRALIA SPECIES. 



The Patellas of New Zealand are all, with the exception of P. 

 tramoserica, confined to that province. They have been referred by 

 Hutton to Patinella, but erroneously, the branchial cordon being 

 interrupted in front as in all Helcioniscus, a group with which they 

 agree in dentition as well. The correct synonymy of many of the 

 species is here given for the first time. 



The dentition of several species has been figured by Hutton, 

 Trans. N. Z. Institute, xv. A useful paper on the anatomy of P. 

 radians has been published by J. A. Newell, Trans. N. Z. Inst. xix, 

 p. 157, plate xi, 1887. 



H. REDIMICULUM Keeve. PL 23, figs. 1, 2, 3, 5. 



Shell oblong, rather depressed, solid, the apex between the front 

 fourth and sixth of the shell's length, and inclined forward. Sculp- 

 tured with about 22 rounded ribs. Ribs dark or buff, intervals 

 bluish-white ; having several darker concentric streaks, and marked 

 near the apex with oblique black stripes. 



Interior somewhat iridescent, obscurely rayed, having a cream- 

 white central callus, often more or less bordered behind with olive ; 

 muscle-scar slightly pinkish. 



Length 41, breadth 32, alt. 12 mill. 



Length 43, breadth 34, alt. 12J mill. 



Southern New Zealand and Auckland Is. 



P. redimiculum REEVE, Conch. Icon., f. 50, (1854). HUTTON, 

 Cat. Mar. Moll. N. Z. 1880, p. 107. E. A. SMITH, Voy. Erebus & 

 Terror, Moll., p. 4, 1. 1, f. 24. P. radians Gm., REEVE, Conch. Icon., 

 f. 25, (not of Gmelin). P. pottsi HUTTON, Cat. Mar. Moll. N. Z. 

 1873, p. 44, teste Hutton. PatineUa redimiculum Rv. HUTTON, 

 Proc. Linn. Soc. N. S. Wales ix, p. 375, (1884.) 



The rounded ribs are nearly smooth. The coloring of oblique 

 blackish stripes around the anteriorly curved apex is characteristic, 

 but shared by some other species. 



