1896.] NATURAL SCIENCES OP PHILADELPHIA. 447 



low the parietal denticle is small, the next to the right, close to it, 

 is higher, slightly bifid at the tip when most completely developed 

 and longer in an antero-posterior direction than either of the others ; 

 the third is small like the first, and the fourth and last (in any of 

 the specimens seen) is still smaller and appears only after the others 

 are well developed. The figure of P. Wolfii given by Reibisch 

 shows the parietal, columellar and three basal denticles; in the fig- 

 ure of P. viimita the fourth basal and another denticle in the angle 

 between the body and the pillar have appeared. Drouet's figure of 

 P. Eyriesii has the parietal tooth represented as double, while the 

 columellar tooth is present only two of the basal denticles appear. 

 All these figures are poor and the resemblance between them, allow- 

 ing for bad drawing, are so close and the diflferences between the ac- 

 tual specimens I have studied are so great, that I am strongly inclined 

 to believe they will all prove to be the stages of one and the same 

 species. Even Reibisch's P. clausa which is somewhat smaller than 

 those above referred to, shows differences of denticulation from P. 

 Wolfii not greater than are observable in the different ages of some 

 North American species. 

 Pupa (Leucocheila ?) clausa Reibisch. 



fupa {Leucochila) clausa Reibisch, Isis, 1892, pt. 3, p.. 15, pi. II, fig. 10. 



On bushes near the sea. Indefatigable Island, Wolf. 



This form differs from the most fully developed P. Wolfii in hav- 

 ing one more denticle on the pillar near its base, in having the 

 other teeth more strongly developed, and in being slightly smaller. 

 According to Reibisch it has 4t whorls, while P. Wolfii-munita has 

 from 5 to 5i turns. It is so diflScult to fix on a common point in 

 settling where the first apical whorl ends, that I do not put much 

 confidence in differences of less than a full turn. It can only be 

 decided by study of a large number of specimens whether this spe- 

 cies is distinct from the P. Wolfii or not, and at present the material 

 is not accessible, 



Herr Reibisch wrote in February, 1894, that he had three or four 

 Avell differentiated species of Pupa from different islands, but, so far, 

 I have not noticed any publication of them, and have not been able 

 for eighteen months to obtain any information as to the whereabouts 

 of Herr Reibisch himself. 

 ■? Trochomorpha Bauri Dall. Plate XV, figs. 8, 9. 



Zonites {Hyalinia) Bauri Dall, Nautilus, V, p. 98, Jan., 1892. 



South Albemarle Island, on weathered bones of tortoises. Dr. 

 Baur. 



