294 



J. Playfair Mc Murrich, 



M3— m — M2— m— M3 

 an arrangement which agrees with that occurring- in C. carnea, in 

 which departures from the fundamental formiila are by no means 

 infrequent. 



In Corallimorplius rigidus (Fig*. D) the formula is 

 Ml — m — Ml — m — Ml, 



the marginal cycles consisting of tentacles of three diiferent sizes, 

 the smallest of which have no corresponding diso tentacles, while 

 the largest have their corresponding disc tentacles much nearer the 

 centre than are those corresponding to the marginal tentacles of 



Fig. D. 



intermediate size. Finally, in C. profundus (Fig. E), while there are 

 again three distinct sizes of tentacles in the marginal cycles, disc 

 tentacles occur only opposite the largest ones, the formula being 

 Ml — m — M — m — Ml. 



It would seem then, that although irregularities may and do 

 frequently occur at portions of the circumference a definite funda- 

 mental plan may be recognized in the arrangement of the tentacles 

 in each of these six species and it is only in C. globulifera and 

 C. carnea that the plan is identical. 



In size the various specimeus of C. carnea varied considerably, 

 many, however, being much larger than those measured by Stuper. 

 Thus some measured 1.0 — 1.2 cm in heiglit and had a diameter at 

 the base of 0.4 — 0.6 cm and at the margin of 0.8—1.0 cm. The 

 coloration of the specimens No. 539 is stated to have been "rust- 

 brown, with blackish tinge around the mouth; disc frequently dark 

 brown; tentacles rust-brown with pale tips". 



S t r u c t u r e. Concerning the anatomical structure I have little 

 to add to KwiETNiEwsKi's account. In the arrangement of the 



