H. W. MARETT TIMS. 



MATERIAL. 



The present collection consisted of twenty-nine embryos together with some 

 portions of the reproductive organs, presumably adult. The youngest specimen had a 

 length of 12 mm., measured in a direct line, and was lying in position "in utero" 

 (PI. I., fig. 1); the oldest, also a uterine specimen, had a total circumferential length 

 of 795 mm., and weighed 12 Ibs. 



Nearly all the material had been preserved in corrosive, but in the larger 

 specimens the uterus had not been opened and thus the preservative had been unable 

 to penetrate sufficiently to act efficiently. 



Omitting the very early uterine embryos and one or two of the larger ones that 

 had been sliced, the following Table furnishes a list of the remainder with their 

 measurements and dates and places of capture. 



The measurements here tabulated are : 



(a) Length of body taken circumferentially from the tip of the snout to the root of the tail. 

 (J) Length of head (circumferentially) from the tip of the snout to a point on a level with the 

 angle of the mouth. 



(c) Length of the tail. 



TABLE I. 



MEASUREMENTS OP FREE EMBRYOS IN ORDER OF SIZE. 



