June 19, 1908] 



SCIENCE 



943 



subgenera. Generic characters may be 

 found in the genitalia (shape of prostate, 

 relative size and form of penis and penis 

 sac) the radula and the shell. It was 

 found upon studying the genitalia that the 

 groups Radix, Megasoma, Galba and 

 Acelta, which had been founded upon shell 

 characters, could also be distinguished by 

 differences in the genitalia. 



Only the North American species have 

 been critically examined f the application 

 of the above criteria results in the follow- 

 ing tentative classification: 



Family LYMN^iDiE Broderip. 1839 

 Subfamily Lymnseinse Dall. 1870 

 Mantle margins retained within margin of 

 sheU. 

 Genus Lymnoea Lamarck. 1799. Type, 



Helix stagnalis Linne. 

 Genus PseudosuccineaBakev,Tiov. Type, 



Lymncea columella Say. 

 Genus Radix Montfort. 1810. Type, 

 Helix auriculat'ia Linne. 

 Subgenus Polyrhytis Meek. 1876. 

 Type, Limncea kingii Meek. 

 Genus Bulimnea Haldeman. 1841. 



Type, Limncea megasoma Say. 



Genus Acella Haldeman. 1841. Type, 



Limncea haldemani (Desh.) Binney. 



Subgenus Pleurolimnma Meek. 1866. 



Type, Limncea tenuicostata M. & H. 



Genus Galia Sehrank. 1803. 



Subgenus Galia (typical). Type, 



Buccinum trunculatiim Miiller. 

 Subgenus Stagnicola Leach. 1830. 

 Type, Buccinum palustre Miiller. 

 ? Subgenus Leptolimncea Swainson. 

 1840. Type, Buccinum glaber 

 Miiller. 

 Subfamily Amphipepliidse Baker, nov. 

 Mantle margins enlarged, covering a por- 

 tion of the shell. 



' Several foreign genera are not here included, 

 as their anatomy is unknown. The study of these 

 genera will not, it is believed, materially change 

 the outline here presented. 



Genus Amphipeplea Nilsson. 1822. 



Type, Buccinwni glutitiosum Miiller. 

 Genus Cyclolimncea Dall. 1905. Type, 



Limncea involuta Harvey. 



Pigmentation in the Feather Germs of a 

 White Ring-dove Hybrid: E. M. Strong, 

 University of Chicago. (Read by title.) 

 The Sense of Smell in Birds: R. M. Strong, 

 The University of Chicago. 

 This is a preliminary report of investi- 

 gations that are not yet completed. The 

 olf aetory^ense was studied in buzzards and 

 ring-doves, but principally in the latter. 

 The behavior of four ring-doves with refer- 

 ence to the odors of cologne, violet sachet 

 powder, and oil of bergamot, was observed 

 with the aid of a labyrinth. This appa- 

 ratus was provided with four apartments 

 opening into a central square enclosure. 

 The doves were fed twice a day in one of 

 these apartments which was chosen at 

 random. An odor was driven out of the 

 chamber containing the food, into the cen- 

 tral enclosure, by a gentle air current. 

 Similar air currents emerged from the 

 other apartments as controls. An air ex- 

 haust was located at the center of the 

 apparatus. The labyrinth was ventilated 

 after each feeding, and this series of ex- 

 periments has been continued for about 

 three months. 



A significant but not regular improve- 

 ment in the accuracy of finding the food 

 was observed. The conclusion reached is 

 that birds may be stimulated by the odors 

 employed, but it is also probable that little 

 use is made of olfactory stimuli. 



A morphological study of the olfactory 

 apparatus of birds is in progress. 



The Anatomy of a Typical Pennatulid: C. 



C. Nutting, University of Iowa. 



A demonstration with lantern slides of 

 the use of photography of objects under 

 water in illustrating the gross anatomy of 

 an aleyonarian, and also the first detached 



