THE NAUTILUS. 119 
Beck is elucidated ; the conclusion is reached that ornatella Beck 
should be considered type of Microcystis. The small one-colored 
Polynesian Zonitoid forms, generally placed in Microcystis, are refer- 
red to the genus Macrochlamys, Bens. 
Youne PyramrpuLa srricosa.—During the past August I 
cleaned 50 P. strigosa and found in each of them from 6 to 15 young 
shells. Have cleaned hundreds before and never found but one.— 
Mary P. Olney, Spokane, Wash. 
NoTE ON THE GENERA OF S. AMERICAN AMNICOLID&.—In writ- 
ing upon this subject in the November Nauriuus, the papers by 
Dr. H. von Ihering on Die Gattung Paludestrina (Nachrbl. D. Mal. 
Gesellschaft, VII, 1895, p. 122), and Zur Kenntniss der Gattung Lith- 
oglyphus (Malak. Bl. VII, 1885, p. 96) should have been mentioned, 
as they are the most important contributions to our knowledge of the 
anatomy of these forms yet made. In regard to the nomenclature 
adopted by von Ihering, one criticism may be made: he states that 
peristomata Orb. is type of Paludestrina, “ weil d’Orbigny nicht nur 
in seiner Voyage Am. Mér., sondern auch 1835 im Mag. de Zool. den 
Namen Paludestrina verwandt und dabeials erste Art P. peristomata 
beschreiben hat.” This is not the case, for in Magazin de Zoologie 
d’Orbigny describes the South American forms under the generic 
name Paludina, and does not mention Paludestrina, which was first 
brought forward in the Voyage. As there stated, the type must be 
“Paludina” acuta, of France. Von Ihering follows Fischer in the 
wrong spelling “ Littorinida” (as though derived from Littorina) of 
Eydoux and Souleyet’s Littoridina; a name evidently intended asa 
hybrid of Littorina and Paludina.—H. A. P. 
ANATOMY OF SuLCOBASIS.—Messrs. William Moss and Wilfred 
Mark Webb have examined the genitalia and dentition of two species 
of this subgenus, Chloritis (Sulcobasis) stirophora and C. (S.) rehsei, 
recording their results in The Journal of Malacology V, no. 3. They 
found both to possess a short spur, in addition to the flagellum, at the 
point of junction of vas deferens with epiphailus, and there was no 
penis-papilla, but the walls of its lumen are wrinkled. The top of the 
tail in stirophora has a median row of large tubercles, only part of 
which are cleft, instead of a continuous impressed line asin Chloritis 
species previously described. The spiral sulci, which gave name to 
the section, do not occur on the base of the shell in C. stirophora, and 
are, therefore, not characteristic of the group. 
