104 University of Calif oi-uin rublicatious in Zoologij [Vol. 11 



1. The majority of specimens between 22 and 26 mm. in 

 length have a width lying between 5.25 and 5.75 per cent. 



2. The majority between 20 and 22 mm. have a width of 

 4.75-5.75 per cent. 



3. The majority between 12 and 20 mm. liave a width of 

 3.75^.75 per cent. 



4. The a.verage width of specimens between 18 and 20 mm. 

 is 4.65 per cent. 



5. The average width of those between 20 and 22 mm. is 5.07 

 per cent. 



6. The average width of tliose between 22 and 24 mm. is 5.24 

 per cent. 



7. The average width of those between 24 and 26 mm. is 5.76 

 per cent. 



8. For every increase of 1 ram. in length there is, on the 

 average, an increase of 0.16 per cent in width. 



Length of Ventr.vl Gangi.ion. — Table 3 shows a pronounced 

 negative correlation between length of animal and proportional 

 length of ganglion, for only in those animals over 22 mm. in 

 length is the ganglion less than 5.25 per cent, and only in those 



TABLE 3 



CORREL.\TION BETWEEN LENGTH OP AXIM.\L AXD PbOPORTION'.\L LEXGTH OP 



Ventral Ganglion 



3 3 7 IS 



r = — 0.621.54 ±0.0305!) 



