(3 Annals of the Carnegie Museum. 



The fossils occur in dark shales and sandstones, the latter being 

 sometimes very hard. We obtained remains of mollusca, a crusta- 

 cean, and fish scales. The shells prove that the rocks belong to the 

 Fort Benton group. The crustacean is Liiuipants canadensis. The 

 new star fish which is described in this paper was found by Mr. 

 William Urquhart several years ago in these Benton beds. He showed 

 me the place where he found it, and the matrix is like the Benton cal- 

 careous sandstone at this place ; so his remembrance of the locality of 

 its discovery is confirmed. The strata dip at a high angle. The 

 locality is near the intersection of the 46th parallel and the iiith 

 meridian and is about twenty-three miles nearly due north of Bozeman. 



LiNUPARUS canadensis (Whiteaves). 



Hoploparia canadensis Whiteaves, Contrib. Canad. Pal., Vol. I., 

 Part I., 1885, p. 87, PI. II. 



(Locality: Highwood River, a tributary of the Bow River.) Ten 

 miles west of the first fork. Probably Fort Benton (p. 89). 



Linuparus atavius Ortmann, Amer. Jour. Sci., Vol. 4, 1897, p. 

 290; fig. 1-3 (Niobrara?) Head of Cottonwood Creek, Mead Co., 

 S. Dakota. 



There are several specimens of different sizes indicating difference in 

 age — three carapaces, one antennal region, one abdomen well pre- 

 served. All agree with this species in every detail except in size. 

 Only one specimen attains the dimensions of the smallest specimen 

 described by Ortmann. 



The Dakota specimen was obtained from Mr. H. F. Wells. The 

 horizon is somewhat doubtful, though he thought it to be Niobrara. 

 There is some doubt also concerning the Canada specimens. 



ASTROPECTEN ? MONTANUS, Sp. nOV. 



The type consists of an impression in the hard calcareous sand- 

 stone. Since it is only an impression its anatomical characters can 

 only partially be made out. 



Size small ; arms five, narrow and gradually tapering, longer than 

 diameter of body ; five radial elliptical figures on body, all except one 

 nearly in line with the long axis of the arms. The most prominent 

 markings are the pits which probably represent the marginal plates. 

 It is possible however that these may be impressions of the ambulacra. 

 Half way from the base to the end of the arm each row of pits is nearly 



