THE NAUTILUS. 47 



Obba marginala (Miill.). 



Elsewhere found widely distributed in the Philippines. The var. 

 sororcula Marts, in Celebes. 

 Helicostyla hticophthahna tagolandensis n. subsp. PI. IV, figs. 5, 6, 7. 



Shell smaller than leucophthalma, slightly more solid, the lip more 

 broadly expanded ; bluish-white with many light green revolving 

 bands and lines on the last half or more of the last whorl. Whorls 

 only 3i. 



Alt. 21, diam. 32 to 35.5 mm. 



H. leucophthalma Pfr. was thought at first to be from Celebes, but 

 the locality Great Sangi Island was pointed out by Ancey several 

 years ago, and the Sarasins collected it there, and have figured the 

 snail laying its eggs in a folded leaf, in their great work on Celebes 

 (p. 204, plate 27). Pfeiffer described and figured leucophthalma as 

 covered with a thin tawny cuticle, irregularly streaked, and having 

 two narrow brown bands above, two wider ones on the base ; and it 

 measured, alt. 21-22, diam. 42 mm., whorls nearly 4. His descrip- 

 tion and figures are reproduced in Manual of Conchology, Vol. VII, 

 p. 113, pi. 26, f. 16, J 7. 



The specimens I have seen from Great Sangi agree better with 

 those described by Sarasins. The spire is transparent-white, as 

 usual ; the last whorl is covered with a chestnut or wood-brown or 

 olive-brown cuticle, which is darkest behind the lip, and fades out 

 to almost white at the beginning of the whorl. This cuticle is 

 obscurely streaked with darker, and shows traces of darker spiral 

 bands and lines. Around the axis there is a paler area. In another 

 shell, a ground similar to that just described is cut into bands above 

 the periphery by white spiral zones, and there is a large white axial 

 area. These shells are figured, plate IV, figs. 3, 4. They measure 

 39 to 41 mm. in diameter. H. leucophthalma evidently belongs to 

 the subgenus Corasia, not to Crystallopsis. 



It is possible that Pfeiffer's types were from another island of the 

 same group, or they may have been merely from another colony on 

 Great Sangi. Such local color-races often exist in close proximity. 

 Xesta cincta (Lea). 



Also found in Celebes, in several varieties. 



PUBLICATIONS KECEIVED. 



How FuLGUR AND Sycotypus Eat Oysters, Mussels and 

 Clams. By Harold Sellers Colton (Proc. Acad. Nat. Sci., Phila., 

 1908). The behavior of specimens kept captive in a salt-water 

 aquarium in the vivarium of the University of Pennsylvania has 

 been studied by Mr. Colton. His observations contradict the preva- 

 lent impressions as to the feeding of conchs, and should lead to 

 further work on the subject. We quote part of Mr. Colton's ob- 

 servations on Fulgur {Sycotyptts) canah'culatum : "The Sycotypus 



