KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 19. N:0 6. 187 



ference that in this and similar (species of Conus etc.) the partitions are inside the 

 whorls and only near the apex, whilst in Autodetus they are decidedly outside the 

 whorls and everywhere along the suture. 



The apical whorls are often filled with shelly matter and solid. H. of a speci- 

 men 6 mill., br. 8 mill. Another specimen from Lau, h. 5 mill., br. 9 mill. 



The smallest or youngest specimens might easil}' be mistaken for young annelid 

 tubes. A few have been delineated on plate XXI figs. 57 — 60. Specimen, fig. 59 — 

 60, is the youngest, nearly 2 millim. in diameter, broadly affixed, of nearly three whorls, 

 without the thin, umbilical border and with the centre of the axis prominent as a point. 

 Next we have, tigs. 57 — 58, larger specimens, nearly 3 millim., where the thin border 

 just is beginning to appear. In this, as well as in the yet smaller, previous shell, the 

 ring of bladders is already present on the bottom of the aperture. 



This characteristic shell is distributed nearly over the whole island and has been 

 met with in all strata, in the lowest shale beds, as well as in the uppermost limestone. 

 It is, however, more abundant in the southern localities. It has been found in the shale 

 beds of Halls huk, of Djupvik in Eksta and in the contemporaneous sandstone of Burs- 

 vik. The State Museum has further obtained it from the limestone beds at ^Medebys in 

 Hall, Likkershamn, Slite, Wisby, Ostergarn, Grotlingbo, Lau, from the oolite of Bursvik 

 and the middle and uppermost limestone of the hill of Sandarfve and Hoburg. It has 

 also been found in the isle of Oesel in corresponding strata, Avhere Schrenk first disco- 

 vered it. 



Fam. XII. LITORINID^ Gray. 

 Gen. HOLOPEA Hall p. p. 



?1845 Cyclora Hall p. p. Sillira. Journ. vol. 48, 294. 

 1847 Holopea Id. p. p. Pal. N. York vol. I, 169. 

 1866 Litiopsis Edw. Forbes according to Salter iu Mem. Geol. Survey, HI, 346. 



Shell globose, naticoid, with short spire, smooth ivhorls with faint, transverse strice, 

 outer lip thin, inner Up reflexed, peristome interrupted, umbilicus deficient or narroio. 



According to the first definition given by Hall these shells were difficult to dis- 

 tinguish from Cyclonema, as he states that the surface is cancellated. But in his la- 

 ter descriptions in Palajont. of N. Yoi'k vol. Ill p. 294, species have been described 

 which are similar to the Gollaiidic ones, enumerated below and also correspond with 

 those referred to Holopea by Salter in Mem. Geol. Survey vol. Ill p. 347, where also 

 species with high spire are included, which probably rather had to be numbered with 

 another genus. 



1. Holopea nux n. 



PL XV fig. 62. 



Shell moderately large, ventricose, nearly globose, with short spire and body 

 whorl many times the size of the spire. Whorls five, obscurely and transversally stri- 



