272 J- Playfair McMukrich. 



Genus ChoviacMs n. (/. 



Sagartiinae witli a thick leatliery coliimii wall, provided in its 

 distal portion witli longitudinal ridg'es whicli may be broken up 

 into rows of tubercles; no cinclides (?). 



16. Choviactis imjKitietis (Couthouy). 



Adinia impatien-s Couthouy, 1846. 



Paradis inipatiens Milke Edwards et Haime, J852. 



Sagartia inipafiens G-OSSK, 1860. 



O/lista impntinis Andees, 1883. 



No. 286. Punta Arenas. 11 fatlioms. 2 specimens. 

 574. Punta Arenas. 10 fatlioms. 2 specimens. 



The four specimens whicli belong to this species are of very 

 different sizes. The largest one is completely contracted, the tentacles 

 and disc being- almost completely concealed, but the others (Fig-. 59) 

 are well expanded. The base is of the adherent type and is distinctly 

 broader than the column. The latter is cylindrical, expanding, 

 however, considerably toward the margin, and its walls are firm 

 and opaque. In the largest individual the lower part of the column 

 is covered with low flat elevations arranged rather irregularly and 

 becoming indistinct near the limbus; in the upper part they are 

 larger and are arranged in twenty-four longitudinal rows separated 

 froni one another by deep furrows. These tubercles are simple 

 thickenings of the mesogloea similar to those occurring in many 

 FheJUinae and are not Verrucae. In one of the smaller individuals 

 the tubercles occur over the greatei- part of the column and are 

 arranged in rows toward the upper part but they are much smaller 

 and less distinct than in the largest specimen, and in a still smaller 

 individual they are lacking, the only indication of their existence 

 being a number of low longitudinal ridges at the upper part of the 

 column, separated by shallow grooves. Apparently the tubercles 

 increase in size and distinctness as the individuals grow and may 

 be almost wanting in small specimens. 



There is no distinct margin, the outermost tentacles being 

 situated along the line of junction of the disc and column. The 

 tentacles are 192 in number and are arranged in four cycles, the 

 innermost of which consists of twenty-four members. They cover 

 nearly the whole of the disc, are moderate in length and rounded 



