1896.] NATURAL SCIENCES OF -PHILADELPHIA. 449 



This species very closely resembles the British S. putris, the spec- 

 imen figured by Jeffreys in his British Conchology might almost be 

 interchanged with a specimen from James Island as regards its gen- 

 eral form. The Galapagos shell, however, has a less even surface, 

 being somewhat irregularly wrinkled with a dull unpolished aspect. 



Succinea brevior Smith. Plate XV, fig. 4 ; Plate XVI, fig. 8 ; Plate XVII, fig. 9. 



Succinea Bettii var. brevior ^xa\\\\^ P. Z. S., 1877, p. 77. 

 Succifiea brevior jy^W, Nautilus, VII, p. 56, Sept., 1893. 



Found near Black Beach, Charles Island, at about 1,000 feet ele- 

 vation on the stems of sJirubbery ; the stems were of a grayish-brown 

 color, covered with small lichens. Dr. Baur. 



Jaw arched, high, thick, horn-colored, the ends acuminate and 

 recurved; anterior surface Avithoutribs, cutting edge with a median 

 projection ; upper interior margin with a quadrate insertion plate as 

 usual in the genus. 



Radula long and narrow, formula 1 ; rhachidian tooth 



24+6-6+24 



tricuspid ; on each side six bicuspid laterals, each with the usual 

 thinning on the lower edge of the base of attachment ; marginals 

 low and wide, the inner cusp larger and longer, bifid, the outer 

 cusp with several denticles ; the extreme laterals lose the distinction 

 between the cusps and show a somewhat irregularly serrate cutting 

 edge. 



This species closely resembles a small specimen oi S. obliqua Say, 

 its color is less ruddy and paler than in S. producta, but the apex is 

 even more vividly rosy ; the axis is pervious in the last whorl, but 

 not as in S. Bettii clear to the summit of the shell. It is readily 

 distinguished from either of the other Galapagos species by its short 

 rather blunt spire. 



Succinea producta Reibisch. Plate XV, fig. 7 ; Plate XVI, fig. 10 ; Plate XVII, fig. 5. 



Succinea ( Tapada) Wolfi var. /r^j^'^/iYrt Reibisch, Isis, 1892, pt. 3, p. 16, t. ii, 

 fig. 12 c. 



Chatham Island, 900-2,000 feet elevation, in moist places among 

 moss and stones, Wolf; southwest end of Chatham Island, on damp 

 lava rocks of a blackish color often covered with very small lichens. 

 Dr. Baur. 



Jaw light horn-color, strong, thick, high, strongly arched with 



the ends rapidly shortened to a point, the interior upper margin 



with the usual quadrate insertion plate ; anterior surface without 



ribs, the cutting edge with a short, wide, mesial projection. 



Radula long and narrow, formula about 1 ; rhachidian 



26+14-14+26 



