146 J. E. Duerden — Jamaican Actiniaria ; 



glandular streak, and its German equivalents, Driisenstreif or Nesseldriisenstreif, 

 I would restrict to the tissue at the apical region of the middle lobe; ciliated 

 streak, or Flimmerstreifen, to the deeply-staining, strongly-ciliated region of the 

 lateral lobes ; intermediate streak, to the region on each side, partly developed on 

 both the middle and lateral lobes, and separating the two zones already indicated ; 

 reticular streak, to the tissue along the basal region of the filament, the term most 

 nearly expressing its character in microscopic sections. 



When the ciliated streak disappears proximally, and the filament becomes 

 what is known as simple, a trilobed outline in transverse section is nevertheless 

 often preserved. Here the lateral enlargements, however, bear no relation 

 except that of position, with the true trilobed filament. They are of the same 

 significance as those to be described in connexion with Corynactis myrcia (PL xv., 

 fig. 3), that is, each is simply a swelling of the ordinary mesenterial endoderm, there 

 being little histological modification and no special supporting mesoglceal axis. 



Histologically the whole of the terminal lobe in the simple filament appears to 

 correspond with the apical tissue of the middle lobe in the trifoliate filament, that 

 is, with the glandular streak as here restricted. Nematocysts generally become 

 more numerous proximally, and the filaments are branched along with the free 

 edge of the mesentery. 



A peculiarity connected with the glandular streak in the present species is 

 that the actual apex in some cases becomes deeply grooved, resembling that 

 figured by the Hertwigs (1879, pi. v., fig. 14) for one of th'e lower mesenteries of 

 Sagartia parasitica, and recalling the condition in the so-called " ectodermal 

 filaments " of the Alcyonaria. 



Ripe ova were present on mesenteries of the higher orders, in one specimen 

 sectionized. M c Murrich found all the mesenteries, even the directives, to be 

 gonophoric. His Bahaman specimens were also hermaphrodite, but none of the 

 Jamaican examples show such a combination of gonads, nor was this the case with 

 the two species described by Kwietniewski (1898). 



The species is found in considerable numbers, associated with Asteractis, in 

 the crevices of coral rock, or on stones embedded in the coral sand, in the shallow 

 waters on the south east-shore of Drunkenman Cay, outside Kingston Harbour. 



They are seen with only the disc exposed, the overhanging portion of the 

 column resting on the surface of the sand, while the base may be buried to a 

 considerable depth. 



The mottled, greyish colours of the younger forms harmonize with their sur- 

 roundings, but the brighter colours of the adults offer a great contrast. Ii 

 is among the abundance of specimens occurring at Drunkenman Cay, that the 

 forms with smooth tentacles are to be procured. Large examples of the species 



