TABLE OF CONTENTS. 



Page. 



Annandale, Nelson. Fresh-water Sponges in the collec- 

 tion of the United States National Museum — Part V. A 

 new genus proposed, with Heteromeyenia radiospiculata 

 Mills as type.— No. 1839. May 26, 1911 1 593-594 



New genus: Asteromeyenia. 



Bartsch, Paul. New Mollusks of the genus Aclis from the 



North Atlantic— No. 1829. May 18, 1911 x 435-438 



New species: Aclis dalli, A. cubana, A. rushi, A. flondana, A. ver- 

 rilli, A. carolinensis. 



. The recent and fossil Mollusks of the genus Bit- 



tium from the west coast of America. — No. 1826. May 



12, 1911 x 383-414 



New species: Bittium (Bittium) panamense, B. (B.) Johnstons?, B. 

 (Semibittium) subplanatum, B. (S.) nicholsv, B. (Lirobittium) orna- 

 tissimum, B. (L.) cerralvoense, B. (Semibittium) larum, Bittium 

 oldroydx, B. fetellum,. B. giganteum, B. casmalicnse, B. arnoldi, 

 B. mexicanum. 



New subspecies: Bittium (Semibittium) attenuatum boreale, B. (S.) 

 attenuatum latifilosum, B. (Lirobittium) catalinense inornatum, B. 

 (L.) munitum munitoide, B. (L.) asperum lomaense. 



. The recent and fossil Mollusks of the genus Cerith- 



iopsis from the west coast of America. — No. 1823. May 



8, 191 1 x 1 327-367 



New species: Cerithiopsis (Cerithiopsis) fatua, C. (C.) oxys, C. (C.) 

 carpenteri, C. (C.) abreojosensis, C. (C.) berryi, C. (C.) galapagensis, 

 C. (C.) cesta, C. (C.) halia, C. (C) aurea, C. (Cerithiopsina) necro- 

 politann, C. (C.) adamsi, C. (Cerithiopsida) diegensis, C. (C.) row- 

 elli, C. (Cerithiopsidella) antefilosa, C. (C.) alcima, C. curtata, C. 

 fossilis, C. gloriosa, C. paramoea, C. bicolor, C. arnoldi, C. magel- 

 lanica, C. antemunda, C. diomedem, C. montercyensis. 



New subspecies: Cerithiopsis (Cerithiopsis) stejnegeri dina. 



. See under Dall, William Healey 277-288 



Bean, Barton A., and Alfred C. Weed. An electric Ray 

 and its young from the west coast of Florida. — No. 1816. 

 April 13, 1911 x 231-232 



. Notes on the genus Lepomis. — No. 1824. May 6, 



1911 x 369-376 



1 Date of publication. 



HI 



