214 



J. H. ORTON. 



VARIATION OF THE GONAD OF CUCU MARIA SAXICOLA. 



The variation in the gonad of Cucumaria saxicola has been investigated 

 in 50 adult specimens varying in size* from about 6 cm. to about 10 cm. 

 in length. The gonad in adult C. saxicola consists of from about 10 to 

 60 club-shaped tubes (see Fig. 1, p. 214). These tubes vary in length 



Fig. 1. Fig. 2. 



Fig. 1. — The gonad and gonoduct of C. saxicola B. and R. (Drawn in situ, X :}.) 



The smgle tube in the lower j^art of the figure on the right shows the shape 

 of the tubes in this species better than those in the upper figure. This tube was 

 taken from a male gonad, those in the upper figure constitute the whole gonad 

 of a female. 



Pig. 2. — The gonad and gonoduct of C. normani Pace. (Drawn in situ from a female 

 specimen, x S.) 



from about 1 mm. to about 3-4 cm. : they are narrowest at the attached 

 end, and vary somewhat in the degree to which the distal end is swollen 

 (see Fig. 1), but at this part they are commonly 3 mm. in diameter. 

 In any particular individual the tubes may vary greatly in size. The 



* These specimens were all measured when preserved, but as they were mostly well 

 expanded the measurements may be regarded as roughly comparable. 



