264 
PROCEEDINGS OF THE NATIONAL MUSEUM. you. XXXIV. 
Fics. 1-2. 
9. 
EXPLANATION OF PLATE XIII. 
Volutoderma clatworthyi, new species. Cat. No. 80878, U.S.N.M. 
Two views of the type, slightly less than natural size. 
. Anatina doddsi, new species. Cat. No. 30880, U.S.N.M. Two views 
of the type. Fig. 4 is slightly less than natural size. 
. Capulus spangleri, new species. Cat. No. 30879, U.S.N.M. Three 
views of the type, natural size. 
. Serpula markmani, new species. Cat. No. 30881, U.S.N.M. <A small 
nearly straight specimen with a smaller tube attached, slightly less 
than natural size. 
Serpula markmani, new species. Cat. No. 30881, U.S.N.M. A group 
of more irregular specimens, slightly less than natural size. 
10-11. Acanthoceras coloradoensis, new species. Cat. No. 30877, U.S.N.M. 
Two views of the type, slightly less than natural size. 
