THE NAUTILUS. 55 



Chatham Island, 1600 feet, 1 specimen. Dr. Baur. 



This shell recalls H. arborea Say, but is much smaller and has a 

 different umbilicus. In the characters of the aperture, etc., not 

 mentioned above, it duplicates arborea. 



Conulus galapaganus n. s. 



Shell close to C. fiilvus, but has five whorls to four in a specimen 

 of fill V us of the same diameter; it has a very well marked suture 

 and the whorls between the sutures are more rounded than in 

 fiilvus. The height of C galapaganus is greater in proportion to 

 the number of whorls. Alt. of shell 3'25 ; max. diam. of shell 2-5 

 mm. 



Chatham Island, 1600 ft., Dr. Baur. 



This shell appears to differ from all the forms like falvus, selenkai, 

 ccecocides, etc., by its smaller size, very brilliant surface, inflated 

 whorls and number of turns. It wants entirely the spiral striation 

 of Zonites bauri which is a much larger and more depressed shell. 

 In fact it seems like an elevated, dwarfed and inflated C. fiilvus. 



There are probably other Helices on the islands which have not 

 yet been collected. 



Succinea corbis n. s. 



Shell small, of two and a half whorls, to which a black mould 

 adheres with tenacity. The first whorl and a half are salmon pink 

 in the adult but the young of the same size are pale amber. In the 

 adult the last Avhorl is of a pale straw color. The shell resembles 

 S. wolji in form but is smaller and has a more contracted aperture ; 

 it is instantly recognized, when examined with a good lens, by its 

 surface which is minutely shagreened all over with an excessively 

 fine network of closely recticulated incised lines. Alt. of shell 4., 

 max. diam. 4 ; extreme length of aperture 4 mm. 



S. Albemarle Island on dry bones of turtles, Dr. Baur. 



The remarkable sculpture is not visible to the naked eye except 

 as a sort of hoary bloom on the surface. Under a compound 

 microscope it looks like closely woven basket work. I have exam- 

 ined a great many Succineas without finding any other species pos- 

 sessing this character. The sparse dichotomous impressed sculpture 

 which appears on Succineas from Samoa and other oceanic islands 

 and is occasionally visible on S. beftii is an entirely different 

 thin ST. 



