THE NAUTILUS. 9 



and though many hours were spent in July in searching for living 

 ones, not one was found, until an improvised dredge brought them to 

 view from a depth of about twelve feet. Hiring a couple of men to 

 row, about two hundred were taken in half a day's work. This fall, 

 however, I was surprised to see them in shallow water (one to three 

 feet), and I collected over a thousand by wading and picking them 

 up one by one. They were not in groups at all, but scattered irreg- 

 ularly in patches over the bottom. Some of them were half buried 

 in the sand and the greater part resting with the head toward the 

 shore, and where a track was visible, it was a line from deeper to 

 shallower water. During the few days under observation, not a sin- 

 gle individual was seen floating on the surface."- BRYANT WALKER. 



THE GROWTH OF LAND SNAILS Two years ago, nearly, I had 

 sent me two Helix albolabris which 1 put in my wardian case, and 

 have had some thirty or more young from them in two annual crops; 

 the first are about 21 mouths old. One of these perfected the white 

 lip last year. Whether from being so often handled and being in 

 the room where people are moving has made a difference in their 

 habits I cannot say, but this year a portion of their "growing" has 

 been done in full view, and they often do not go into their shells 

 when I take them up. 



One snail put an addition to his house of a full half inch at once. 

 I happened to see him as he was finishing ; he had built from the 

 umbilicus on one side, then from the farther side which we call the 

 top, and was connecting the two sides when I found him. The con- 

 nections seemed like tiny crystals thrown from each side, as ice 

 forms in a pail of water, then it was covered with a jelly-like sub- 

 stance, and in a few days after he had added the first thin gelatine- 

 like wall of lip, and now IK; has the finished hard white lip. 



I have often seen one which has the new addition as much like 

 gelatine as possible, then so brittle that the merest touch will break, 

 then like the old shell. JENNIE M. H. MORRELL, Gardener, Maine. 



LAND SHELLS FROM REJECTAMENTA OF THE Rio GRANDE AT 

 MESILLA, NEW MEXICO, AND OF THE GALLINAS R. AT LAS 

 VEGAS, N. M Prof. T. D. A. Cockerell sent the following species 

 from the localities named. A previous Mesilla list has been given in 

 NAUTILUS X, p. 42. 



