64 



G. LINnSTUOM, ON TIIE .SILUJIIAN GASTKOrODA AND PTEROPODA OF GOTLAND. 



? Nat/ca ijkmcinoides. 

 Natica parva. 



Pilcopsis vetustis (? = vutustntis). 

 Nerita haliotis. 



Capidus neritoiclcs vaw sidcata. 

 Natica subparva. 

 Gapulus haliolis. 



Viipultis euoinphaloides. 



Platystoma niagarensis (= e). 

 Acroculia haliotis. 



Gapulus Branni. 



Capulus sulcatus. 

 Acroculia cornuta. 

 Acroc. sulcata. 

 Acroculia euomphaloides. 

 Naticopsis parva. 



1839. Sow. Sil. Syst., 603, pl. 3 f. 4. 



1843. MouKis Catal. Brit. Foss. 1st Ed. 154. 



1839. Sow. Sil. Syst. 612, pl. 5 lig. 24. 



1843. MoiiMs Catal. 153. 



1848. Beonn Nomencl. 786. 



1848. Phillips Mem. Geol. Survey, II, 259. 



1854. Moiuiis Catal. 2d Ed. 263. 



1854. Salteu in MmiciiisoN Siluria 2d Ed., pl. XXV f. 1. 



1839. Sow. Sil. Syst. 616. 



1839. Sow. Sil. Syst. 625, pl. 12 f. 16. 



1843. MoEuis Catal. 154. 



1848. Bronn Nomencl. 805. 



1862. Mac Coy Sil. I^^oss. Ireland, 13. 



1848. Bronn Nomencl. 217. 



1850. D'Orbigny Prodr. 29. 



1850. Id 1. c. 31. 



1854. Morris Catal. Ed. 2, 239. 



1855. Mac Coy Pal. Foss. 290. 



1857. GiEBEL Zeitschr. f. gesammto Naturwiss., 165. 



1852. Mac Coy A. N. H. ser. 2. vol. 10, 196. 



1854. Morris Catal. 2d Ed. 239. 



1855. Mac Coy Pal. Foss. 290, pl. 1 K, f. 39. 

 1852. Hall Pal. of N. York vol. II, 287, pl. 60 f. 1. 

 1860. P. RoEMER Tennessee, 75, tab. V f. 15. 



1854. Salter Siluria 2d Ed. 2301 



1859. Id. Siluria 3d Ed. 548 j ^ '• ^'^ ^- ■'■ 



1871. Baily Figures of cliaract. Brit. Fossils, part. III, 64, pl. XXI f. 12. 



1873. Salter Cambridge Fossils, 89, 154. 



1874. Alxh Galizien, 31. 



1857. GiEBEL Zeitschr. gesararat. N. W. 167; according to him Hisinger's 

 Pil. cornuta is the same as MiJNSTER's Cap. Brauni. Now, even if 

 it could be proved that they were identical, this latter species was 

 ereated some years låter than Hisinger's and it wonld be contrary 

 to all rules of equity and priority to abolish the older name. 

 GiEBEL 1. c. 166. 



1857. 

 1867. 

 1867. 

 1873. 

 1873. 



Lindström Nomina fossilium Gotl. 23. 



Salter Cambr. Foss. 171, 

 Id. 1. c. 185. 



Shell of highly variable shape, iiaticiform with prominent spire, neritoid with 

 depressed spire or planorbiform with sunk spire- Generally transverse or broader than 

 high, with the body whorl enormonsly developed. The ornamentation of the outside 

 is characteristic. It is very difficiilt to fiud specimens, which exhibit it sufficiently 

 clearly. They have mostly been subjected to the tear and wear on the shore before 

 being imbedded or siiffered from corrosion or also been changed after their fossilization. 

 The ornamentation is of the same pattern in all, only changing in minor details. It 

 changes with the age of the shell, different in the young and the adult or on the spire 

 and the last whorls. It consists of two sets of lines, which intersect each other. There 

 are delicate, wavy, longitudinal lines, interrupted by the often irregular lines of growth 

 and other elevated lines. On the spire, pl. II figs. 30—31, the longitudinal lines are 

 threadfine, elevated, with intcrstices many times surpassing their breadth and at regular 

 distances they are interrupted by the transverse lines. On the body whorl near its 

 middle line they have increased in size, with minute, microscopical lines between the 

 large transverse one.s. On the inferior side the longitudinal lines are large, broad, 



