138 



(ToRREYA 12: 290-291. 1912). The writer's attenrion was 

 called to the latter paper by Dr. O. E. Jennings, of the Carnegie 

 Museum, when the specimen was shown to him. The specimen 

 differs from that described by Lamb in that the shell is divided 

 into four, instead of three parts. In the sketch, ^ is a view of 

 the shell from the front or pointed end, and B the back or rounded 

 end. It will be noticed that the division of the shell is not 

 symmetrical, no two portions being quite the same size, and also 

 that the minor or secondary fissure (the one extending upwards 

 from left to right in .4) is not complete at the back of the shell. 

 C is a view of the kernel, in the same position as the shell in A, 

 and £> is a top view of C. The malformation appears to have 

 affected the appearance of the shell more fundamentally than 

 that of the kernel. The specimen is now in the possession of 

 Dr. Jennings at the Carnegie Museum, Pittsburgh. 



Since the above paragraph was written, a number of abnormal 

 walnuts have come into the possession of the writer. Of these, 

 three showed division of the shell into four parts, as seen from 

 the point end, while seven showed division into three parts at 

 this end. Of these seven, however, three showed division into 

 four parts, almost symmetrically, at the rounded end, and there 

 seemed to be a tendency for the nuts to be unsymmetrically 

 tricarpellary, — that is, the shell is divided into two equal halves 

 by a continuous fissure, and then one of these halves again 

 divided by a fissure at right angles to the first. Of these ten 

 abnormal walnuts, two were found in the open stock of a local 

 grocery store, one of these two being tricarpellary, and the other 

 tetracarpellary. The remaining eight came from a grove in Santa 

 Ana, California, and represented apparently somewhat less than 

 one per cent, of this particular lot of nuts from this grove. One 

 of these eight was unsymmetrically tetracarpellary, while the rest 

 were either symmetrically or unsymmetrically tricarpellary. 

 In addition to the above, several walnuts were found in which 

 the normal grooving of the shell was deepened in certain direc- 

 tions as seen from the rounded end, most of them showing a 

 tendency to divide into four approximately equal parts. One 

 specimen showed an unsymmetrical division of the shell into 



