PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 99 



Pykgulifera humerosa Meek, 



Fig. 10.— Lateral view of type specimen ; natural size. 



Fig. 11. — Opposite view of tlie same. 



Fig. 12.— Similar view of a smaller example. 



Pyrgulifera (Paramelania) damoni Smith. 



Fig. 13.— Copy of Mr. Smith's original figure. 



Pyrgulifera (Paramelania) crassigraxulata Smith. 



Fig. 14.— Copy of Mr. Smith's original figure. 



EXPLANATION OF PLATE IV. 



CORBICULA RERTHOUDI (sp. QOV.). 



Fig. 1. — Left side view ; natural size. 



Fig. 2.— Dorsal view of another example. 



Fig. 3.— Interior of left valve of another example. 



CORBICULA ACGHEYI (sp. IIOV.). 



Fig. 4.— Right side view ; natural size. 

 Fig. ."i. — Interior view of the same examjile. 

 Fig. 6.— Dorsal view of another example. 



Neritina bruneri (sp. nov.). 



Fig. 7. — Lateral view ; natural size. 



Fig. 8.— Apertural view of the same example. 



MELANOPSIS AMERICANA (sp. IIOV.). 



Fig. 9.— Two different lateral views ; enlarged. 



Fig. 10.— Another view of the lower part of the same example, sho.wiug the beak 

 and the callus of the inner lip. 



4.-THE HOI.I.USCAIV FAUIVA OF THE TKICKEE OKOUP, IIVCJ.VD^ 

 II\G A NEW FOR.Tl. 



By €. A. WHITE. 



lExtracted from the Aunual Report of the United States Geological Survey for 1882, b.y permissiou of 

 the Director] ' 



In volume II, Paleontology of California, Mr. Gabb described and 

 figured two species of fresh- water fossil niollusca from the valley of Snake 

 River, Idaho, which he stated to be of Tertiary age. In volume IV, 

 United States Geological Survey of tlie Fortieth Parallel,. IMr. Meek 

 described and figured seven other species, one from Soutliwestern Idaho 

 and the others from the Kawsoh Mountains, in Northern Nevada. He 

 referred these to the Tertiary period, and they evidently came from 

 strata that are geologically equivalent witli those which furnished :\rr. 

 Gabb's specimens. Mr. King, in volume 1 of tbe last named survey, re- 

 ferred these strata to the Miocene epoch of the Tertiary period, and 

 gave them the name of Truckee Group. 



