REPORT ON ACTINIARIA. 



231 



tance of about 0.5 cm. from the margin had a very irregular 

 surface, appearing as if verrucose, though it is impossible on 

 account of the poor preservation to say that verrucae were 

 actually present. The sphincter was remarkably strong, more 

 so than in any of the hitherto described species of Bolocera, 

 and consisted of a median axis provided with very numerous 

 lateral lamellae arranged pinnately (Fig. 4). 



The tentacles were about 1.6 cm. in length and, as is usual 

 in the Boloceridas, were attached to the disk by a narrow 

 neck, beyond which they suddenly enlarged to a somewhat 

 bulbous form, tapering off distally to a more slender portion. 

 The longitudinal ridges with which they were provided were 

 very numerous and low, so that they were evident only on 

 close scrutiny. The only trace of color persisting in the speci- 

 men was found in the tentacles, which, especially in the bul- 

 bous portion, were of a brownish purple color. The sphincter 

 of the tentacles, which occurs just distal to the narrow neck, 

 was thickened at its free edge, where it bore muscle processes, 

 one of which, with lateral secondary processes, was especially 

 long and projected into the lumen of the tentacle towards its 

 apex. This process, however, did not seem to be equally 

 developed all around the sphincter fold, sections which passed 

 through the axis of the tentacle showing it in some cases only 

 on one side (Fig. 5). 



In most of the species of Bolocera which have been studied 

 anatomically the sphincter is of the diffuse endodermal type. 

 This is the case with B brevicomis and B. longicornis where 

 it is typically diffuse; and in B. occidua and B. kerguelensis, 

 in which, however, there is an indication of circumscription in 

 that in the upper portion of the muscle there is a strong meso- 

 gloeal process which bears secondary pinnately arranged pro- 

 cesses, the whole not projecting, however, much beyond the 

 general mass of the sphincter. 1 In B.fannosa this upper pro- 



1 Practically the same arrangement I have found in forms from the east 

 coast of North America identified by Verrill ('73, "83, etc.) with B. tuedice 

 (Johnston) Gosse. This identification is, however, open to question until 

 the anatomical characteristics of the European and American forms have 

 been compared. 



