CONCHOLOGICAL CORHECTIONS AND ADDITIONS. S5 



in : Bericht über die Senckenbergische naturf. Gesellscbaft 

 in Frankfurt a/M., 1890, pag. 157, especially with the variety 

 bearing the manuscript name porcellanea; indeed I could 

 not detect a single character that might have specific value. 

 The Museum specimens are partly deprived of the enamel , 

 but this is only individual , probably they were not col- 

 lected alive, as the operculum is wanting. Prof. Boettger, 

 having seen a typical specimen, fully agrees with my opinion 

 and so P. sucinacia falls in synonymy, since the name 

 Junghulini has the priority for twenty three years. I think 

 this error may be accounted for, by the different method 

 of measuring; von Martens says: 



«Long. 11, diam. maj. 9, min. 5~/.j ; apert. alt. 6, lat. 

 5 Mill.» and Boettger: «Alt. 9 — 9'/2, diam. max. 6'/2 — 7, 

 apert, intus 3^4 mni. alta, 3 lata.» 



Now the largest specimen in the Leyden Museum has 

 from the apex to the base of the peristome only lO'/j 

 mill, long.; so «Long. 11» by von Martens is probably 

 a typographical error for 10, the other specimen measures 

 scarcely 10 mill.; these measurements are taken diagonally; 

 if taken perpendicularly they are still smaller. The diam. maj. 

 of 9 mill. , is even scarcely reached if one takes the utmost 

 breadth in an oblique direction ; if measured horizontally 

 without the peristome it is a trifle more than 7 mill. Von 

 Martens has measured the aperture with the peristome in 

 its largest extension, Boettger without the peristome. It is 

 a new proof how desirable it is to have a uniform method 

 for measuring shells. 



Cyclotus dimidiatus Kobelt. 



A few months ago I had to study some shells from 

 Celebes, belonging to the Leyden Museum, amongst which 

 I found a Cyclotus which I suggested to be C. dimidiatus 

 Kobelt, described in: Abhaudlungen und Berichte des Königl. 

 Zool. und Anthropol. Ethnogr. Museums zu Dresden, 

 1896/97, N° 5, under the title »Schnecken von N. O. 



Notes from, the Leyden INluseum , Vol. XX. 



