— 417 — 



The Nautilus, a quarterly devoted to thf inlerests of 

 Cnnr-holngists. Ediinrs : II. A. Pilsbiy and C. V/. Johnson. 



Vol. XXXI, n'^ 1, July 1917. 



Contents : Bryant W/VLkek. A ]'»evision of the Classificalion 

 of the Noith American PatelHfonn AncylidH', witli Descrip- 

 tions of New Species [Ferriss-nnce n. subfam. ; nhodacmewre 

 n. subfam. : Hhodacmea n. gen. ; lîhodacnica cahau^bensis 

 n. sp., Alabania ; Rhndocephala n. sect. ; Bhodacmea rho- 

 ducme, R. Gicatkiniana nn. spp., Alabama] (PI. i-III). — 

 \V. H. Dai.l. a new Species of Astartc froni Alaska 

 [A. Willctti n. sp.]. — W. H. Dall. Notes on boréal land and 

 freshwater Sheils. — Mrs. Ida S. Oldroyd. A nev; Cahfornian 

 Sigarelus [Sinuin californicum n. sp.]. — S. S. Berry. A new 

 Sonorella froni Arizona [S. l'oosevelliana n. sp.]. — T. ^'■A^' 

 Hynin'g. The distinctive characters of IjonpsiUs minor and 

 L. villosa. — Ralph J. Gilmore. Notes on reproduction and 

 gix)wth in certain viviparous mussels of the family Sphaeri- 

 diidse (PI. IV-VI). — Jas. H. Ferriss. Collecting Sheils in a 

 corner of the Sierra Nevada [EpiphragmophoTa callistoderma. 

 Oreohelix Handi nn. spp.]. — W. H. Dall. Mrs. Maiia 

 B'aldridge (Obituary). — Notes : Bryant \Vai,ker, A Sinistral 

 AmpuUaria ; — Bryant Walker, Valvala tricarinata percon- 

 i'usa n. n. ; — T. D. A. Cockerell, An Arboroal Polijfjyra 

 [P. texasiana tillandsia' nov.]. 



Vol. XXXI, n" 2, October 1917. 



Contents : E. P. Chace. Notes on the Variation of Ischno- 

 chilon conspicuus Cpr. — Wm. A. Marshali,. Lamjjsilis ven- 

 tricosa cohongoronta in the Potomac River. — John B. Hen- 

 DERSON. Collecting Days about the Naval Station, Guanta- 

 namo Bay, Cuba. — H. A. Pilsbry. Amnicolidie irom Oneida 

 Lake, N. Y. [Aninicola Bakeriana, A. Clarkei, A. oneida 

 nn. spp.]. — L. S. Frierson. New Gênera and Species of 

 Central American Naiades [Psoronaias kuxensis n. sp.] 

 (PI. VII). — L. S. Frierson. On the Rate of Giowth of Pond 



