38 G. LINDSTRÖM, THE ASCOCERATIDAZ AND THE LITUITIDAE. 
Fam. LITUTITID EE. 
Gen. Ophidioceras8 BARRANDE. 
There is nothing to add to the generic characters given by previous authors, if 
not that the body chamber is of an excessive length in all the Gotland specimens which 
have been sectioned. It occupies more than one whorl, in some more than two. 
BARRANDE already in 1874 mentions Ophidioceras as occurring in Gotland according 
to a notice of ÅNGELIN. 'Two species have hitherto been found there. One, O. reticu- 
latum, has a vertical distribution from the lower shale beds to the uppermost limestone- 
beds inclusive. It has not as yet occurred in the intervening beds d—e. Horizontally 
it has been found from the northernmost to the southernmost localities of the island. The 
second species, O. rota, is restricted to the uppermost limestone beds of a few places in 
the south-eastern Gotland. Both species are very well distinguished from each other 
through the characters given below. 
I see no reason of placing this genus with the Ascoceratid& as Hrartrt has done. 
Its species have quite different ornamentation, a ventral keel and the form of the aper- 
ture is also different. Moreover, they want totally the sigmoid septa. 
1. Ophidioceras reticulatum ANGELIN. 
P1. VII figs. 21—33, 38—40. 
Syn. 1880. OO. reticulatum ANG. in Fragmenta Silurica p. 9, Tab. XV, fig. 31—32, Tab. XVI f. 1. 
1885. LiNpsSTR. List of Foss. Upp. Sil. Foss. of Gotland p. 6. 
1888. Ip. List of Fossil Faunas of Sweden p. 7. 
Geological & Geogr. Distribution. In the stratum c it has been found at the fol- 
lowing localities: 
Fårö, Lansa, the canal from Stormyr in Rute, the shale of Slite, Grogarnsberg, Wisby 
Norderstrand, Westergarn, Djupvik in Eksta, Petesvik in Hablingbo, Bursvik. 
In the strata f—h: 
Fårö, Lansa and Lauters gamla hamn, Sändvik in Fleringe, quarries in Hangwar, 
Slite, Lännaberget, Samsugn in Othem, Klints in Othem, Rums in Martebo, Storwede in 
Follingbo, Grogarnsberg, Ljugarn, Lau backe, Linde klint, Sandarfve kulle, the cliff near 
Fröjel church, the limestone beds above Djupvik in Eksta, Petes-canal in Hamra, Holms 
hallar in Wamlingbo. 
