HKFEKKNCK TO PLATES. 263 



Siniisujera. 



S. ("aledonica, Crossso. Jour, de Coneh., xxviii, 14G, t. 4, 1". 2, 

 1880. 

 In describing the above species, M. Crosse dissents from the 

 general belief that the genus is synonymous with CheJetropis. 

 The former, says he, by its well formed spire, with nuclear apex 

 and thickened lip appears to be adult, whilst the latter, thin and 

 transparent, is probably the larval state of a pelagic species. 



Farjxira. 



P. H^MASTOMA, Linn. A more critical examination of the 

 figure of d'Orbigny's 1\ viverratoidea convinces me that the 

 species has been incorrectly identified by me. It has been re- 

 ferred to CantJuD-Ks variegafus by several conchologists, and is 

 doubtless that species. A shell of the same general form as 

 viverrafoides is, however, a frequently occurring variety of 

 hatftnastoma. 



REFERENCE TO PLATES. 



Plate 1 (Frontispiece). 



FIGURES. PAGE. 



1. Murex ramosus, Linn. Reeve, Conch. Icon., f . 8 95 



2. Murex inflatus, L. (= ramosus, L.). Kiener, Coq. Viv., t. 1 95 



Plate 2. 



1. Section of a Conus perforated by Lithodomi. Woodward's Manual, 



f. 25, p. 34 22 



2, 3. Sectionsof ('onus ponderosus, Brug. Miocene of the Touraine ; 



a, outer layer; b, middle; c, inner layer; d, e, f, lines of 



growth. W oodward, f. 24, p. 32 19 



4-6. Sections of Strombus gigas, showing the shell layers and their 



structure. Keferstein, Bronn's Thierreichs, t. 71, f. 5-7 19 



7. Structure of shell of Cyprsea mauritiaua, 235 diam., Keferstein, 



t. 71, f. 8 19 



8, 9. Aragonite crystals on the inner side of the pearly layer of the 



shell of Pinna nigrina, magn. 360 diam. Keferstein, t. 71, 



f. 9, 10 19 



10. Polished surface of pearly layer, magn. 85 diam. Ibid., f. 11 . . 19 



11. Section of Pinna nigrina, showmg rhombohedral crystals. Kefei'- 



stein, t. 71, f. 12 19 



12. a, Repaired operculum of Fusus; b, normal operculum of Pleuro- 



toma Babylonica; c, abnormal operculum of PI. Babylonica. 

 Zool. Proc, London, 101, 1854 15 



13. Fusus antiquus, used as a lamp in Zetland. .Johnston's Intr. to 



Conch., f. 9, p. 64 



