85 



Tlic Siicia Island fossil jigrccs almost cxa<tly with Mc-ck's diagnosis of the American 

 shell ligured as JV. dcgans, but the former is rather the most compressed of the two. 



AcT.TiON, Sp. nndt. (Page 53.) 



Six specimens were described under this name, which probably belong to two 

 species, perhaps even to difl'ereut genera. Two of those liave a narrowly cylindrical 

 shape like that of Aclxoa aftciunifa, Meek, * the others a swollen body whorl- and a 

 very short spire, much as in I'Keudobuccinitiii XehriKcenxe. \ Another specimen of 

 the short inflated form has recently been obtained by breaking up .small pieces of rock 

 from the Queen Charlotte Islands, and this has part of the test preserved. Under the 

 microscope the sculpture is seen to consist of flattened revolving ribs, with nearly 

 perpendicular sides, separated by grooves of nearly equal width, both of which are 

 crossed by fine, transverse, raised striie. liini/uicidu varia, Gabb, J from the Chico 

 Group of Cow Creek, Slia.sta County, California, has exactly the same surface markings, 

 but it has a more elongated spire than the present species, and has five or six whorls 

 instead of three. 



ERRATA. 



Piige 7, line 12 from the bottom. For " rarelij,'''' read " harelii." 



Page 21, line 7 froifi the bottom. For " seem," read " seems." 



Page 24, line 6 from the top. For ''I'late HI,,. tig. 3,'' read "Plate ni.,fiy. 1." 



' " Report on the Invertebrate Cretaceous and Tertiary Fossils of the Upper Missouri Country," pasce 

 281. Plate XIX., figs. 17, a. b. 



t Idem, patje 350. Plate XXXI., flys. 5, a, h, c, d. 



X " PalcBOUtolo<jy of California," Vol. L, pafe'e 112. Plate XXIX., fifjs. 222, a. b. 



