68 VERRILL, SYNOPSIS OF 



tentacles (branchise ?) within the circle of simple tenta- 

 cles in addition to those outside. Rhodactis has the com- 

 pound tentacles between two circles of simple tentacles. 

 Actinotryx has only the compound tentacles within the 

 circle of simple ones. Actinodactylus has the simple and 

 compound tentacles intermingled, and the structure ot 

 the latter is quite different. The genus, Actinoporus Duch. 

 and Mich., resembles this genus somewhat, but lacks the 

 simple tentacles, the compound ones occupying the whole 

 surface of the disk. 



This genus is, therefore, of much interest, since it com- 

 pletes one of the series of possible combinations of char- 

 acters proper to this subfamily. 



AMPHIACTIS ORIENTALIS Verrill, sp. nov. 



Base broad, divided at the edge into irregular lobes. 

 Column of firm texture, subcylindrical, covered over its 

 whole surface with elevated, papilliform verrucas, which 

 are capable of contracting to low, nearly flat suckers, 

 with concave tops. These verrucse are most numerous 

 and apparently more elevated on the upper parts, and 

 are arranged in regular vertical rows, many of which can 

 be traced to the base, the verrucas below the middle 

 becoming more distant and mostly contracted. The up- 

 per part of the column forms a distinct fold, denticu- 

 lated or crenulated on its edge. The outer compound 

 tentacles are numerous, short and much subdivided, the 

 lobes being small and rounded. The simple tentacles 

 are elongated, moderately stout, tapering, arranged in 

 about three crowded rows, and quite numerous. The in- 

 terior compound tentacles are numerous and resemble the 

 exterior ones, but are less subdivided, those nearest the 

 mouth being the smallest. They cover most of the disk 

 between the mouth and the circle of simple tentacles. 

 Mouth large, with prominent lips, having many lateral 

 folds. The tentacles are not contracted in alcohol, but 

 the disk is so much withdrawn that the margin of the 

 column partially conceals them. Height of alcoholic 

 specimen 1.25 inches; diameter of base .1 of an inch. 



