The Actiniae of the Plate Collection. 239 



abolition of the genus or the bestowai of a new name lipon it would 

 now be very confusing and it seems preferable to simply remove 

 impatiens from it and recognize it as limited by Hertwig. 



6. Fcifcictis nivea (Lesson) Verrill. 



Actinia nivea Lesson, 1830. 



Actinia (Isaemcea) nivea Ehrenberg, J834. 



Aciinia. {Diplostephnnus) nivea Brandt, 1835. 



Actinia (?) nivea Milne Edwards, 1857. 



Sagartia nivea Verrill, 1869 (nee Gosse, 1860; nee Duerden, 1898). 



Avptasia nivea Andres, 1883. 



Paradis nivea Verrill, 1899. 



No. 150. Coquimbo. 1 specimen. 



The Single individnal of this species (Fig. 16) was pronouncedly 

 goblet-shaped and measured 2.5 cm in height. The base was some- 

 what expanded measuring 0.5 cm in diameter, and, though slightly 

 bulbous, was evidently adherent. Immediately above the base the 

 column was relatively very narrow, measuring only 0.3 cm in diameter, 

 biit from that it gradually enlarged until at a distance of abont 

 2 cm from the base it had a diameter of 0.7 cm. At this point it 

 enlarged snddenly to a diameter of 1.3 cm, which size was maintained 

 iip to the margin. Thronghont the proximal part the wall was 

 minutely rugose and had a firm leathery consistency, but in the distal 

 portion it was smooth, thin and somewhat translucent. The margin 

 was smooth and the tentacleS; which covered the greater portion of 

 the disc, were moderately long, slender and rather flaccid. The inner 

 ones measured about 0.6 cm in length. 



In color the column Avas pure white throughout. The tentacles 

 were apparently arranged in irregulär groups differing in colour; 

 there were three groups of a purplish-brown color alternating with 

 groups which w^ere almost coloiiess although occasionally here and 

 there a purplish-brown tentacle occurred in thera. 



Structure. In the column wall the mesogloea was throughout 

 much thicker than the ectoderm, although its actual thickness 

 differed in the upper and lower portions, the former region being 

 only one-tenth the thickness of the latter (Figs. 18 and 19). It 

 was throughout fibrous in structure and in the upper part was almost 

 reticular in the outermost portions. The circular musculature was 

 but moderately developed and immediately below the margin there 

 was an oval mesogloeal sphincter, reticular in structure and lying 

 much more closely to the ectoderm than to the endoderm. 



