M0LLU8CA. OJ 



and appears to correspond with Rimer's idea of the Limarckian 

 shell (Coq. Yiv. t'ol. 3 I, f. 81) and also with the specimen figured by 

 Kiister (Con. -Cab. pi. 2-'>. t'. 5). But whether all or none of these 

 figures delineate the true P. undata appears to mo questionable. 

 However, I do not believe that tin' West-Indian shell which has 

 been assigned to it by d'Orbigny (Kamon de la Sagra's Hist. Cuba, 

 vol. ii. p. 145) and those figured by Tryon (Man. Conch, f. 82, 100 

 1013, and 109) can beyond a doubt be considered Lamarck's species. 

 The dimensions he gives, namely 22 lines in length, exceed those 

 of the West-Indian examples: nor does the description of the colour, 

 " albo et fusco-nigricante Longitudinaliter undatimque picta," apply 

 ■well to those shells, hut admirably suits the specimens figured by 

 Kiister, Reeve, and Kiener. The locality, '* Monte Christi, West 

 Columbia," given by Reeve for his shell is no doubt erroneous, and 

 applies to two others on the same tablet, considered by Cuming the 

 same species, but which on careful examination prove to be without 

 doubt examples of P. biserialis, Blainville (=-/ J . bicostalis. Reeve, 

 ? of Lamarck). This species has a character not found in P. bitu- 

 bercfularis and its varieties, namely the oblique plications on the 

 lower part of the columella ; and P. fasciata of Reeve, which is also 

 conspecirlc with P. undata, d'Orh. (non Lamk.), and P. forbesii, 

 Dunker, also has on the columella a distinguishing character which 

 lias not been noticed, viz. a small brown stain, most observable in 

 fresh specimens, at the inferior end, and au oblique mark of the 

 6ame colour in a line with the raised ridge at the base of the body- 

 whorl. 



35. Purpura ( Cronia ) amygdala. 



Purpura amygdala, Kiener, Coq. Viv. p. 39, pi. 10. tig. L'G ; Chenu r 



Man. de Conch, fig. 807. 

 Buccinum amygdala, Reeve, Conch. Icon. fig. GO. 



Hub. Port Denison, 4 fms. (Coppinger) ; Home Islands, off Cape 

 Grenville, N.E. Australia, also Moreton Bay, Port Jackson, and 

 Port Darwin (Brazier). 



The operculum of this species is normally Purpuroid, although 

 the basal chauncl of the aperture is unusually narrower than in the 

 genus. 



36. Sistrum undatum, var. 

 Ricinula fiscellum, Heeve (non Chemnitz), Conch. Icon. pi. 4. fig. 28. 



I lab. Port Darwin (Goppinger) ; Port Essington (Jules in Brit. 

 Mus.). 



This variety is also quoted from the north coast of Australia by 

 G. and H. Xevill (Journ. Asiatic Soc. Bengal, 1875, vol. xliv. pt. 2, 

 p. 83). It differs from the typical form of this well-known species 

 in its greater breadth, in having fewer and larger nodose plications, 

 and in the fineness and closeness of the transverse squamose 

 ridges. 



e 2 



