THE NAUTILUS. 71 



always collected Lampsilis luteolus, Sphairium simile, S. staminemn, 

 S. fabale, Pisidium abditium, P. buJceri (= P. amnicum Miill., teste 

 Sterki), Limncea palustris, L. desidfosa, Planorbis campamdatus, P. 

 trivolwis, P. bicarinatus, P. deflectus, P. parrus, Ancylus parallehis, 

 Physa heterostropha, Pleurocera siibulare, Bytldnia teiittiodafa, Ainiii. 

 cola limosa, A. lustrica, A. obtnsa, A. cincinnatiensis, Gil/fa altilis, 

 Somatogyrus subglobosus, Yulvata sincera, V- tricarinata and V. 

 obtt/sa. Pisidium bakeri Pilsbry has been found in great abundance 

 at Summerville, where specimens nearly a quarter of an inch in 

 length have been collected. Y<ili'ata obtusd Drap. was found at both 

 Charlotte and Summerville in 1899 fully as abundant as V. sincere/ f 

 This species was reported from this country for the first time in 1897 

 when but a few specimens were obtained. In the interval between 

 that time and August, 1899, it had increased a hundred fold. It is 

 probable that many introduced species will lie found in our Great 

 Lakes if the shore debris be carefully searched. 



The localities mentioned above have yielded altogether 150 species, 

 many of which may be found here in as great abundance and perfec- 

 tion as at any locality in the northern part of the United States. 



NOTES AND NEWS. 



A NEW AMERICAN SLUG Dr. J. F. Babor has described an in- 

 teresting new form, Arloliniax steindachneri, from a specimen col- 

 lected by F. Steindachner on Puget Sound, in 1874. ' It is large, 

 length 80 mm., breadth 1'.), height 21 mm., about the size of Ario- 

 litniix columbiaints, and differs externally from that species in having 

 the well developed tail pore an open slit, as in Hesperarion, not 

 plugged as in the other Arloliniaces. The teeth are as in A. califor 

 nirus. The genitalia lie free, the ovotestis anterior, at the stomach. 

 The pi j nis contains a large papilla but is otherwise hollow, much as 

 in Hesperarion. There is no appendiculum, and no 4% retensor " 

 muscle, but a vaginal retractor is developed. 



The species is clearly intermediate to some extent between Hes- 

 perarion and Ariol/max, and may indicate that the former group 



1 Annaien des K. K. Naturhist. Hot'museums, xv, 1900, p. 95. 



