236 J- Playfair McMürrich, 



The various individuals which I liave ventured to assign to this 

 species present considerable differences in geueral appearance in the 

 preserved condition biit anatomically tliey do not show sufficient 

 dissimilarity to Warrant their Separation into several species. 



The base is adherent in all and the column is more or less contracted 

 and has assumed the form either of a low dorne or of a short cyl- 

 inder (Fig. 44), the tentacles being completely concealed in some, 

 while in others they are partly exposed. One of the individuals 

 from Tumbes (Fig. 45) was considerably higher than the rest and 

 had its tentacles almost concealed. The column wall is provided 

 with Verrucae to which, in some individuals, particles of sand and 

 Shell were adhering, but the extent to which the Verrucae were devel- 

 oped varied greatly. They are in all cases arranged in longitudinal 

 rows, forty-eight in number, and which may either extend the 

 entire length of the column, as in two specimens from Puerto Montt, 

 or may be limited to the upper half, the lower half having a retic- 

 ulated appearance not unlike that seen in some specimens of An- 

 tholoba achates. The Verrucae are not borne on pedicles, but resemble 

 those of Parantheopsis cruentata for instance. 



At its distal end each alternate row of Verrucae is prolonged 

 upon a well marked conical process resembling an acrorhagus in 

 appearance but possessing no special development of nematocysts. 

 These structures are what Carlgken (1899) has named pseudo- 

 acrorhagi, and they are very noticeable in the more expanded in- 

 dividuals. Since they correspond with the alternate rows of Ver- 

 rucae their number is twenty-four, but half of them are much smaller 

 than the others, with which they alternate. 



The tentacles are short, stout and roimded at the tips, and in 

 some cases showed indications of being longitudinally fluted. They 

 were too much crowded to make a certain'count, but seemed to be in the 

 neighbourhood of 100, probably 96, in number. The disc and mouth 

 were concealed in all the specimens. 



In the majority of the individuals the height and diameter of the 

 column is about the same and somewhere about 1.5 cm. Some spe- 

 cimens are, however, more conical, an individual from Puerto Montt 

 measuring 1.5 cm in height while the diameter of its base was 2.5 cm, 

 and another from Tumbes had a height of 2.5 cm, with a diameter 

 at the base of 1.7 cm. Notes giving the coloration in life accom- 

 pany the specimens from Oavancha and Puerto Montt. The former 

 is Said to have been provided with "Reihen von rothen Warzen" 



