166 PROCEEDINGS OF THE NATIONAL MUSEUM. 



SEELYA(?) (PLETHOSPIRA?) ULRICHI, new species. 

 (Plate XII, figs. 9, 10.) 



This interesting little shell has many of the characteristics of 8. 

 ventricosa Ulrich,i from the Calciferous (Beekmantown) stage. It is, 

 however, a much smaller shell, and differs from all known species of 

 Seelya in having the revolving bands nearly obsolete. 



There are four of these shells, which were sent to Mr. Ulrich for iden- 

 tification. He writes : 



The specimens are casts of the iuterior, aud the revolving peripheral furrows 

 probably have nothing to do with the revolving sculpture of the true Seelya. Simi- 

 lar furrows occur in good casts of Lophospira boivdeni and other Pleurotomariidte. 

 The band, I believe, was of the flat or concave type, as in Seelya, Phthospira, and 

 Hormotoma, but, as it was evidently close to the suture and partly covered by same, 

 it is too low on the whorls to be in strict accordance with these genera. 



Collector.— A. H. White. Oat. No. 28187, U.S.N.M. The American 

 Museum of ISatural History has two specimens collected by Mr. R. W. 

 Porter. The species is named for Mr. E. O. Ulrich, who has accomplished 

 much in bringing about a better understanding of the fossils of the 

 American Lower Silurian. 



Family EUOMPHALID^. 



HELICOTOMA(?) (LIOSPIRAi") LARVATA Salter. 



Helicotoma larvata Billings, Canadian Organic Eemains, Decade I, 1859, p. 15, 

 pi. II, figs. 11-14. 



Of this species there is a single excellent specimen, which the writer 

 at first labeled Liosinra angulata Ulrich, variety. However, when 

 Ulrich compared the Arctic example with the type species he con- 

 cluded it to be Helicotoma larvata Salter. He has kindly made the 

 following notes on this specimen : 



This species resembles Liospira mwndula, L. angulata, and other species of that 

 section of this genus very greatly, and it may be, as I once thovight, truly referable to 

 Liospira. Excepting that the Arctic specimen is small, it is the best preserved yet 

 seen by me. Still I am unable to settle the difficulty. Whatever light it casts upon 

 the problem is in favor of retaining the species under HeliGotoma. 



In Canada this is a Black River species. 

 Collector.— A. H. White. Oat. No. 28179, U.S.N.M. 



Family MAOLURIID^ Woodward. 



MACLURINA MANITOBENSIS (Whiteaves). 



Maclurina manitolensis Ulrich and Scofield, Geol. Minn., Ill, Pt. 2, 1897, p. 

 1041, pi. Lxxvi, figs. 4, 5; pi. lxxxii, fig. 45. 



This species is common at Silliman's Fossil Mount and attains a 

 large size, one specimen measuring nearly 5 inches in diameter. In 



■Geol. Minn. Ill, Pt. 2, 1897, p. 1009, figs. 7, b, c, d, in test. 



