448 PROCEEDINGS OF THE ACADEMY OP [1896. 



The single specimen of this interesting form is not quite adult, 

 and the slight angulation at the periphery may be lost in the fully 

 mature shell. The fine spiral striation which characterizes the spe- 

 cies recalls that of several Polynesian species. The close resem- 

 blance to T. calculosa Gould, of Tahiti, leads to the query as to 

 whether the unnamed " Helix " collected by Darwin, and said to be 

 identical with a Tahitian species not named, may not have been this 

 species. It can only provisionally be referred to the group Trocho- 

 morpha, as the animal is unknown. 



Conulus galapaganus Dall. Plate XV, fig. 11. 



Conuhis galapagajius Dall, Nautilus, VII, p. 55, Sept., 1893. 



Under leaves at 1,600 feet elevation, southwest end of Chatham 

 Island, Dr. Baur. 



This species is close to C. fulvus but has five whorls to four in a 

 specimen of fulvus of the same diameter. It has a very well marked 

 suture and the whorls between the sutures are more convex than in 

 fulvus. The height is greater in C. galapaganus in proportion to the 

 number of whorls. It seems to differ from C. fulvus and related 

 forms by its smaller size, very brilliant surface, inflated whorls and 

 number of turns. It has no spiral striation like that of T. Bauri, 

 and, in short, seems like an elevated, dwarfed inflated C. fulvus. 



Vitrea chathamensis Dall. Plate XV, figs. 3, 10. 



Hyalinia Chatham etisis Dall, Nautilus, VII, p. 54, 1893. 



On dead leaves at an elevation of 1,600 feet, southwest end of 

 Chatham Island, Dr. Baur. 



This is a small, thin, straw colored shell, much like V. arborea 

 Say, depressed, with four rounded whorls, a distinct suture, the 

 polished surface sculptured with numerous slightly flexuous radial 

 indented lines ; the umbilicus is deep, exhibiting all the volutions, 

 but rather narrow. The aperture is like that of H. arborea. 



Sucoinea Bettii Smith. Plate XV, fig. 6. 



Succinea Bettii Smith, P. Z. S., 1877, p. 72, t. xi, fig. 8. 

 Succinea Wolfi Reibisch, Isis, 1892, pt. 3, p. 16, t. 2. fig. 12 a-b. 



Charles Island, H. M. S. Peterel, U. S. Fish Commission ; James 

 Island at James Bay, Dr. G. Baur ; Chatham Island, 900-2,000 feet 

 in the moist region, among moss and stones and on herbage. Wolf; 

 South Albemarle Island ? on dry bones of turtles, young specimens 

 only, Dr. Baur. 



