360 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



obsolete, being apparent only on the upper surface behind the peri- 

 stome. The spiral sculpture is poorly developed on both upper and 

 lower surface, but is a little stronger on the lower than the upper. 



Type.— The type, U.S.N.M. No. 382699, comes from Ilin Island, 

 south of Mindoro. It has 5 whorls, and measures: Height, 13 mm; 

 greater diameter, 29.2 mm; lesser diameter, 22.5 mm. 



Remarks. — This subspecies, like Obba mesai mesai, has the crisscross 

 sculpture poorly developed. It is distinguished from 0. m. mesai by 

 having the spiral sculpture much less strongly developed. 



I take pleasure in naming this for Rear Admiral Marbury Johnson, 

 who was in command of the Albatross during the first half of her 

 cruise in Philippine waters. 



OBBA MARMORATA ILINENSIS Bartsch 



Plate 90, Figure 4 



1932. Obba marmoraia ilinensis Bartsch, U. S. Nat. Mus. Bull. 100, vol. 6, pt. 7, 

 p. 341, pi. 86, fig. 3. 



This is the smallest race of this species. Its distribution is rather 

 interesting, and it is quite possible that careful collecting in Mindoro 

 will show races of it eventually. It is a pale race, the shell being 

 rather broadly conic. The periphery of the last whorl is rather 

 rounded than angulated, but an obsolete indication of angulation is 

 present. The incremental lines on the upper and lower surface are 

 not so rough as in the other races, and the wrinkling of both surfaces 

 resembles scratches more than the strong wrinkles of some of its other 

 subspecies. The aperture is oval, moderately broad, and the peristome 

 is strongly expanded and reflected on the outer and basal lips. The 

 umbilicus is narrow and half covered by the reflection of the inner lip. 



The unique type, U.S.N.M. No. 313001, was donated by Walter 

 F. Webb. It comes from Ilin Island, which lies a short distance off 

 the south coast of Mindoro. It has 4.8 whorls, and measures : Height, 

 13 mm; greater diameter, 14.2 mm; lesser diameter, 19 mm. 



OBBA PLANULATA (Lamarck) 



Plate 92, Figures 1, 5 



Obba planulata (Lamarck) was described in part 2, volume 6, page 

 73, of the "Histoire Naturelle des Animaux sans Vertebres," in 1822. 

 No locality is cited as a habitat. In 1838, Deshayes, in his edition of 

 the same work, cites Ferussac's "Prodrome," page 69, and Ferussac's 

 "Histoire Naturelle des Mollusques," where on pages 48 and 49 he 

 discusses Helix planulata Lamarck and where he gives three figures 



