io Mathews and Iredale, "Perry's Arcana." [v^'xxix 



cd., p. 749, 1758). In the Bull. U.S. Fish Commission, vol. 

 xx., part 1, igoo, p. 416, Dall and Simpson used Septa, Perry 

 (1811), to replace Triton, Montfort (1810), not Linne (1758), 

 Triton i 11 111, Cuvier (1817), not Muller (1776), for the shells 

 congeneric with Mar ex tritonis, Linne. 



In the Smithsonian Miscell. Collections, vol. xlvii., pp. 114 

 et seq. (1904), Dall wrote up an historical and systematic review 

 of the Frog-shells and Tritons, and therein gave his reasons for 

 thus accepting Septa, and named as type S. rubicunda, Perry. 



But this prior introduction of Septa in conjunction with a 

 shell not congeneric with S. rubicunda, Perry, necessitates a 

 readjustment of names. Pilsbry (Proc. Acad. Nat. Sci. 

 Philad., vol. lvi., p. 21, 1904) cited Septa as a sub-genus of 

 Aquillus, Montfort, but as Septa appeared on 1st January, 

 1810, and Aquillus 1810, it is very doubtful whether the latter 

 appeared at such an early date. It is certain that Septa must 

 be referred to the neighbourhood of Cymatium, Bolten (1798), 

 but whether as an absolute synonym of that name or whether 

 it can be retained sub-generically we are not prepared to 

 decide. A monograph of the Tritons is much required, and 

 would appear to be urgently necessary, inasmuch as Dall's 

 review (above quoted) was of a skeletal nature, and not 

 altogether satisfactory, as we have seen the same shell given 

 three different generic locations by students attempting to 

 utilize Dall's key. 



The third shell is called Rostellaria rubicunda, and it is 

 obviously the same shell as figured by Chemnitz (vol. xi., p. 

 146, tab. 195A) as Strombus erythrinus, and which Tryon 

 (Man. Conch., vol. vii., p. 119, 1885) relegated to the synonymy 

 of Strombus dentatus, Linne, with varietal rank. 



The fourth is Trochus apiaria, " a nondescript, lately im- 

 ported from Botany Bay." The same figure is given in the 

 " Conchology," pi. xlvii., fig 3, with the description slightly 

 altered and the locality given as Van Diemen's Land. When 

 Hedley discussed Perry's Australian shells he ignored this 

 species, and we are unable to definitely name it. 



Plate VI. is of Septa tritonia = Murex tritonis, Linne. 



Perry wrote : — " This shell, classed with the genus Septa, 

 and which has hitherto been described erroneously as a 

 Murex . . . ." ; and then noted — " Another shell, which 

 has considerable resemblance in its general form to the one 

 now described, has lately been discovered in New Holland, 

 but it differs in the minuter peculiarities of form and colour, 

 being much smaller, and of a redder colour." This apparently 

 refers to the shell figured in the " Conchology " as Septa 

 rubicunda. In the later work Septa tritonia is not reproduced, 

 though most of the " Arcana " shells are here again illustrated. 



