474 Verrill, Notes on Hadiata. 



forations on the lower side, from which water may be ejected. Simi- 

 lar perforations occur in the sides below the margin. Tentacles elon- 

 gated, subequal, rather numerous, separated from the margin by a 

 narrow but distinct fosse. Type, A. Krebsii D. and M., 1860. 



This genus was originally based upon a single species, with the 

 characters given above. Subsequently tAVO other species were added 

 by the same authors, having quite different structures, and the generic 

 characters were modified accordingly. As defined in the later work 

 the genus does not difier materially from Bunodes^ and in fact one of 

 the species referred to it, A. pallida., appears to be a true JBunodes, 

 having imperforate walls and simple tubercles. The other species, A. 

 gramdifera, has imperforate walls, non-adhesive tubercles, those 

 around the margin being compound. This probably belongs to our 

 genus, Cladactis. It seems necessary, therefore, to restrict the genus 

 to its original limits, including only those species with perforated 

 walls, adhesive suckers, and compound sub-marginal papillae. As thus 

 limited it is allied to Aulactinia* nobis, and to Evactis. The latter 

 differs, however, in having the outer tentacles largest, and the margin 

 surrounded by simple tubercles ; the former has moi*e complex sub- 

 marginal appendages and appears to be imperforate, but when better 

 known may prove to be identical. 



Anthopleura Dowii Verriii, sp. nov. 



Actinia Dowii Bradley, MS. 



Column cylindrical, but little elevated, with vertical rows of rather 

 distant, large, adherent, verruciform suckers, which have concave sum- 

 mits ; the upper ones largest, becoming more distant and much smaller 

 below, nearly obsolete near the base. Surface between the suckers 

 smooth in expansion, when contracted covered with elevated, reticu- 

 lated wrinkles. Corresponding to each row of suckers there is a prom- 

 inent, inflated, submarginal tubercle ; these are mostly divided into 2 

 to 6, slight, rounded lobes, each one perforated on the lower side by 

 several small pores, through which water may be ejected, but no ojjen- 

 ings through the walls below could be detected in preserved speci- 

 mens. Margin of the disk separated from the tentacles by a narrow 

 fosse. Tentacles rather slender, elongated, subulate, arranged in three 

 rows, in the larger specimens 108 or more, in smaller ones often only 

 48. Disk broad, with radiating striations, mouth small, with numer- 

 ous folds ; stomach often everted. 



* Memoirs Boston Soc. Nat. History, i, p. 20, 1864. 



