18 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



AMPHIDROMUS MACULIFERUS, subspecies? 



Semper, in his Reisen im Archipel der Philippinen (vol. 3, p. 149), 

 1873, writes: 



Finally, I have in my possession three examples of a form which were pre- 

 sented to me in Cebu, of which the specific locality in which they were found 

 was unknown. The shell is much more inflated than in the named varieties of 

 maculiferus, of a beautiful yellow color, with a simple or double brown varix. 

 The apex is edged with black, and in two of the examples a few brown spots 

 are present under the suture. The dimensions of the two extreme forms are : 



Long. 57, diam. maj. 35, min. 28 ; apert. alt. 29, lat. 15 mm. 



Long. 64, diam. maj. 31, min. 26 ; apert. alt. 30, lat. 14 mm. 



This probably is nearest related to Amphidromus palaceus var. sulfureus, but 

 I dare not take the responsibility for deciding whether that should be placed 

 here or not. I am equally reluctant to describe it as a new species, since I 

 do not consider that I have sufficient material. 



I have not seen specimens from the island of Cebu, and there- 

 fore simply call attention to the fact that these three specimens which 

 Semper had seen may have come from that island; and if so, it is 

 quite likely that they represent something different from any of the 

 forms that are mentioned in this paper. 



AMPHIDROMUS MACULIFERUS. subspecies? 



From Lampinigan Island I have a shell which is badly worn, Cat. 

 No. 244692, U.S.N.M., collected by Lieut. Col. Edgar A. Mearns, 

 which differs from any of the described forms. There are traces of 

 brown markings on the badly worn white surface which indicate 

 that it probably belongs near A. basilanensis. 



AMPHIDROMUS MACULIFERUS COSMIUS, new subspecies. 

 Plate 9, fig. 4. 



Shell elongate-ovate, very thin, yellowish white, with the whorls 

 moderately rounded and the summit of the whorls appressed. The 

 first two whorls show the narrow, faint dark band immediately above 

 the suture. The succeeding turns are marked by irregularly dis- 

 posed, hydrophanous axial bands of variable width, which are most 

 pronounced on the third and fourth turns. The last whorl is marked 

 by weak axial threads, the remainder being marked by mere incre- 

 mental lines. Aperture oval; outer lip somewhat expanded and re- 

 flected, thin and white at the edge ; inner lip short, somewhat twisted, 

 broadened at the base, and reflected partly over the narrow umbili- 

 cus; parietal wall covered by a thin callus, which is of pale rust color. 



The type (Cat. No. 245562, U.S.N.M.) was collected by Lieut. Col. 

 Edgar A. Mearns on Basilan Island. It has 6.2 whorls and measures — 

 length, 52 mm. ; diameter, 25.5 mm. 



