_ 4 — 



Phyllactis Milne-Edwards and Haime, 1852. 

 Oulactis Milne-Edwards and Haime, 1852. 

 Cereus (pars) Milne-Edwards, 1857. 

 Lophactis Verrill, 1869. 

 Asteractis Verrill, 18(39. 

 Evactis (p. p. Andres, 1888. 



A. conchilega (Dnch. Mieli.) 

 Ol' this species, there were six specimens in the Turin collection 

 and these were in four bottles. In two bottles there were only Carl- 

 gren's labels, but the third contained ali tour labels, those ol' Du- 

 chassaing and De Filippi reading Oulactis conquilega Duch., and in 

 the fourth bottle there was a De Filippi label reading Actinosiella 

 conchilega Duch., St. Thomas. 



In ali the specimens the upper part of the column was provided 

 with adhesive verruca 3 arranged in tbrty-eight longitudinal rows, the 

 number in each row being from seven to nine in three individuals 

 and ten or eleven in a fourth. The acrorhagi had the forni of thin- 

 walled elevations of the outer portion of the disc, hearing upon their 

 surface hollow tubercles or short digitiform processes, arranged either 

 singly or in groups, but apparently unbranched. Along the line of 

 insertion of each mesentery a radiai groove traversed the acrorhagal 

 area, which thus was divided into as many radiai portions as there 

 were mesenteries, a condition not always readily perceived, however, 

 owing to the degree of contraction. 



The tentacles were short, stout and 

 thick-walled, their longitudinal muscu- 

 lature being well developed. They were 

 approximately or actually forty-eight in 

 number in those specimens in which 

 they could be counted. No attempi, was 

 made to determine the arrangement of 

 the mesenteries, but it seemed evident 

 from the grooves traversing the acro- 

 rhagal area and from the tentacles that 

 they were forty-eight in number, i. e. in 

 twenty-four pars. The stomatodaeum was 

 provided with two deep siphonoglyphs. 

 The sphincter muscle was of the en- 

 dodermal circumscribed type in the single 

 individuai in which it was examined. 

 It was attached by a narrow stalk, va- 

 rying slightly in its complexity in different sections, and was deci- 

 dedly unilateral in structure, so that it might be. described as unila- 



Fig. 1 



