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 Maerochlamys, Bens. 



YOUNG PVRAMIDULA STRIGOSA. 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. 

 Mnry P. Olnei/, Spokane, Wash. 



NOTE ON THE GENERA OF S. AMERICAN AMNICOLIDJE. III Writ- 

 ing upon this subject in the November NAUTILUS, the papers by 

 Dr. H. von Ihering on Die Gattung Paludestrina (Xachrbl.D. Mai. 

 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 nichtnur 

 in seiner Voyage Am. Mer., sondern auch 1835 im Mag. de Zool. den 

 Namen Paludestrina verwandt und dabei als 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 Littoritia) of 

 Eydoux and Souleyet's Littorldina; a name evidently intended as a 

 hybrid of Littorina and Paludina. H. A. P. 



ANATOMY OP SULCOBASIS. Messrs. William Moss and Wilfred 

 Mark Webb have examined the genitalia and dentition of two species 

 of this subgenus, Chloritis (Siilcobasis) siirophora 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 flagelluni, at the 

 point of junction of vas deferens with epiphallus, 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 as in 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. 



