78 THE NAUTILUS. 



STJCCINEID^E. 



Succinea luteola Gould. In the vicinity of Tampico this species 

 was numerous in a pasture ; near Valles they were found along the 

 wagon road, but more plentiful on a railroad embankment. They 

 are richly colored, reddish with pale and dark streaks ; some albino 

 specimens were taken. 



Succinea luteola Gld., var. subtilis Marts. Valles; only two 

 examples taken. 



Succinea sp. Tampico. Found in a loose pile of decaying vege- 

 tation and on the skull of a cow. The specimens taken are not 

 quite as large as S. luteola, and are thinner. 



VERONICELLIDjE. 



Veronicella sp. Valles ; scarce, in shaded places. 



cyclostomatid^e. 

 Adelopoma stolli Martens. Tampico. A single specimen found 

 in the drift. Pilsbry says " This small species was described by 

 Prof. Von Martens as Diplommatina stolli. This example is a little 

 smaller than typical stolli, with weaker ribs and less swollen penult, 

 whorl. The last whorl is gibbous above the columella, a character 

 not noticed by Von Martens in his description of stolli. The num- 

 ber of riblets is about the same as in stolli, or perhaps somewhat 

 greater. Until further examples are found the value of these differ- 

 ences from stolli is uncertain." 



lymn^eid-s:. 



Lymnaea cubensis Pfr. Valles. Taken from a pool by the 

 roadside. 



Planorbis cultratus Orb. Tampico. This small flat species was 

 noticed in but one place ; they were taken from the edge and under- 

 side of a piece of board and other driftwood lying on the land near 

 the edge of a small pond. A few Seg. obsti-ucta were taken with 

 them. 



Planorbis liebmanni Dkr. Tampico and Valles ; only dead speci- 

 mens found in river debris. 



Planorbis sp. Tampico. A very small form found in the drift. 



Segmentina obstructa Morelet. Tampico and Valles. A com- 

 mon species in ponds ; dead ones were numerous in places in the 

 drift. 



