208 G. LINDSTRÖM, ON THE SILURIAN GASTROPODA AND PTEltOPODA OP GOTLAND. 



Plate 1. 



Fig. 1 — 3. Conularia cancellata Sandb. pag. 42. Fig. 1 spines on the lowest row with broken points, 



whence the ciroular openings, f. 2 part of two transverse ridges highly magnified, f. 3 



longitudinal sectiou. The long spiues are those on the ridges, the short ones are sections of 



the ridges where no spines are fouud. 

 » 4 — 8. Conularia bilineata n. p. 45. F. 4 lateral view, f. 5 section near the upper luargin, f. 6 surfaoe 



near the apex magnified, f. 7 the same higher up between the two median septa, f. 8 



ornamentation iu lower part of tbe shelL 

 » 9 — 12. Conularia monile n., p. 44. P. 11 transverse lines magnified and sectioned longitudinally, f. 12 



transverse section of transverse lines. 

 » 13 — 16. Conularia leevis n., p. 45. Fig. 15 transverse section of specimen fig. 13., fig. 16 surface of 



fig. 14 enlarged. 

 » 17—24. Autodetus calyptratus Schrenk, p. 185. Fig 17 shell in its natural position and grown on a 



Favosites, figs 17 a — 22 other specimens and details of apex and umbilicus, fig. 24 part 



of the longitudinal sectiou magnified to show the cellulär structure outside the whorls. 

 1) 25 — 31. Tryhlidium reticulatum u., p. 55. Fig. 27 — 28 apex of a young specimen, f. 29 interiör stratum 



with traces of colour bands, f. 30 mnscular scars of the inside, f. 31 longitudinal section 



of the shell. 

 » 32. Patella (Olana) cochlear L. Recent. Inside to show the muscular scars. 



" 33 — 37. Tryblidium unc/uis n., p. 56. Fig. 36 inside of apex with oval pit like a scar, f. 37 inside of 



shell with mnscular scars. 

 « 38 — 39. Nacella deaurata Gmeltn, recent from Foua, to oompare the exteriör shape with the preceding. 



