216 BULLETIN 181, UNITED STATES MATIOiNlAL MUSEUM 



whorls and ineasuies: Height, 7.6 mm.; greater diameter, 15 mm.; 

 lesser diameter, 8 mm. Height of aperture, 5.1 mm. ; diameter, 5.5 

 mm. The largest specimen has 4.2 whorls and measures : Height, 14.1 

 mm.; greater diameter, 19.6 mm.; lesser diameter, 14.6 mm. Height 

 of apertm-e, 8.9 mm. ; diameter, 9.5 mm. 



This species is quite widely distributed ; we have it from the follow- 

 ing Guatemalan stations: U.S.N.M. No. 377979, 1 specimen collected 

 by H. F. Loomis at Uaxactun, Peten Province ; U.S.N.M. No. 302030, 

 42 specimens collected by W. Popenoe at Magalango ; U.S.N.M. No. 

 423977, 7 specimens collected by H. van der Schalie li/4 miles south 

 of Flores, Peten Province; U.S.N.M. No. 423978, 5 specimens collected 

 by van der Schalie 2 km. south of Puebla Nueva, Peten Province; 

 U.S.N.M. No. 423976, 6 specimens collected by van der Schalie 2 km. 

 south of Puebla Nueva, Peten Province ; U.S.N.M. No. 484860, 1 speci- 

 men collected by O. F. Cook at Cacao. 



In addition to these, there are 10 lots of this subspecies from British 

 Honduras, as follows: U.S.N.M. No. 251123, 1 specimen from near 

 Punta Gorda, 7 miles' west of the Caribbean Sea, collected by J. Lyman ; 

 U.S.N.M. No. 382737, 33 specimens collected by C. Wythe Cooke at 

 El Cayo, 1 mile on the Benque Viejo road; U.S.N.M. No. 382738, 37 

 specimens collected by C. Wythe Cooke at the foot of a limestone hill, 

 left bank of the Belize River 11/2 miles above El Cayo; U.S.N.M. No. 

 382714, 36 specimens collected west of Gales Point by C. Wythe Cooke ; 

 U.S.N.M. No. 193013, 2 specimens from the Cayo District collected by 

 W. A. Stanton. 



Several others do not have specific localities but are labeled merely 

 "Honduras." These are : U.S.N.M. No. 356080, 4 specimens collected 

 by J. H. Campbell; U.S.N.M. No. 316388, 1 specimen; U.S.N.M. No. 

 150728, 6 specimens collected by Ingersoll; U.S.N.M. No. 150734, 1 

 specimen collected by W. A. Stanton ; U.S.N.M. No. 20111, 1 specimen 

 collected by Dyson. 



This subspecies is nearest related to A. (N.) nicajraguense, but dif- 

 fers from it in having the axial sculpture within the umbilicus much 

 more feebly developed, as well as in being much smaller. 



APEROSTOMA (NEOCYCLOTUS) SMITHI Pilsbry and Clapp 



Plate 30, Figures 22, 27 



1902. Aperostoma smithi Pilsbry and Clapp, Nautilus, vol. 15, pp, 135-136, pi. 



7, figs. 5, 8. 

 1923. Poteria (Neocijclotus) smithi H. B. Baker, Occ. Pap. Mus. Zool. Univ. 



Michigan, No. 137, p. 33. 



We have not seen specimens of this species and copy Pilsbry and 

 Clapp's description and figure : 



