The Actiniae of tlie Plate Collection. 287 



in Fig'. 77. Both external and internal stomata are present and the 

 mesenteries of the two broader series, with tlie exception probably 

 of the directives, are fertile. 



23. Cribrina hermnpJwoditiea Carlgeen. 1899. 



No. 116. Antofogasta. 13 specimens. 

 402. Tnmbes. 5 specimens. 



448. Puerto Montt. 13 specimens. 



The specimens from Tumbes and Puerto Montt were all ex- 

 panded, those from the latter locality having* the stomatodaeum exten- 

 sively evag'inated (Fig-. 78); the individuals from Antofogasta, on 

 the contrary, were all contracted to a low dome-like form, with the 

 tentacles only slightly exposed (Fig. 79). The base was adherent 

 and but little larger than the column. This in its distal half or 

 third is provided with longitudinal rows of Verrucae, to which par- 

 ticles of sand and shell were adherent. The number of the principal 

 rows was as a rule twenty-four, although a certain amount of Vari- 

 ation occurred, one individual from Puerto Montt possessing- only 

 twenty-one; alternating- with these principal rows were short rows 

 of smaller Verrucae. At the extremity of each principal row was 

 a more or less conical pseudo-acrorhagus, situated upon the marg'iu, 

 between which and the bases of the outermost tentacles was a 

 distinct fosse. The tentacles were short, stout and rounded at the 

 tips ; they seemed to vary slightly in number in different individuals, 

 as forty-fine were counted in one, forty-six in another and in another 

 forty- eight. 



The specimens from Antofogasta were all small, some measuring 

 only 1 mm in height and the largest 5 mm, the base of the latter 

 individuals measuring 7 mm in dianieter. Of the specimens from 

 the other localities one measured 1 cm in height, but the majority 

 were only about half that size and had a diameter of about 0.9 cm. 

 No traces of color remained in any of the specimens. 



Structure. The column mesogioea is as a rule thinner than 

 the ectoderm, but is raised on its outer surface into numerous low 

 ridges. The Verrucae did not possess any pyriform cells. The 

 general circular musculature is fairly well developed, but the sphincter, 

 though of the circumscribed form, is rather small and varies some- 

 what in its development in different individuals. Usually it has 

 the form shown in Fig. 80 and appears at flrst sight to be of the 



