KEPOKT ON THE ALCYONARIA. 257 



line of the ribbing while towards the grooves they decrease in size. The rough spindles are 

 continued on the retractile jxirtion of the polyp wall, but they are there smaller and less 

 thickly set in the mesoderm. Thick, warty, transversely disposed spindles form a ring 

 under the base of the tentacles, while some spindles are continucil on t<j the tips of th(! 

 tentacles ; these spindles measure O'l to 0"18 mm. in length, with a (barnetir of 0'07 mm. 

 They are closely packed, but are not continued into the pinnae. In the wall of the 

 CEsophageal tube scattered spicules also occur. In the wall of tlie stolons the spindles 

 become smaller, more delicate, and more sparsely Ijeset with waits ; the spicules are 

 often slightly curved, but even here they form a tliick layer. They measure 0'4 mm. in 

 length by 0"04 mm. in breadth. 



The colour of the colony as preserved in .spirit is white. 



The species is distinguislied from all related forms by the marked development of the 

 calyx. 



Habitat. — Station 23, lat. 18' 24' N., long. 63' 28' W.; n^ar Sombrero Island, West 

 Indies ; depth, 450 fathoms. 



B. Me7nbrriii>j)oda. 



Clavularia dongata, n. sp. (PI. XLII. fig. 11). 



The polyps rise from a thin basal membrane wdiiih covers a dead univalve shell. 

 They attain a height of 12 mm., and occur in part singly, in part in groups. The 

 individual polyps are narrowed superiorly, but are swDlh-n out at the base. The wall 

 of the calyx is somewhat flabby. 



The membrane which contains the endoderm canals is thin, slightly stretcheil, and 

 filled with spicules. The polyps spring especially from its margin, but are few in 

 numl)er. Each includes a calyx portion, with completely retractile tentacles and an 

 oe.sophageal region. The calyx portion is about 12 mm. in lieight ; near the somewhat 

 thinner base it expands to a thickness of 4 mm., wliile >uperioily it measures Imt 

 3 mm. The wall is rough owing to spiny spicules which are I'niliedded in it, but it is not 

 rigid, rather in fact flabby and yielding. Distinct broad grooves run from the base to 

 the oral region ; between these the wall shows eight Ijroad and slightly jtrojecting ridges ; 

 when the I'olyps are retracted the oral region presents the fniiu nf an eight raved star. 



The tentacles, which are provided with spicules, are fidiliM] together over the oral 

 disc, and by the infolding of the wall below the oral region thi^y are l^artly ilrawn into 

 the calyx. 



S])icules are e^mljedded in tlie calyx ribs in lonuitudinal bundles; the}' are Ijright 

 .-ilvery .-pindles, slightly curved, and with a tendency to as.sume a club-.^ha[ie liy licing 

 sliglitly tliii-keneil and trune-ated at one end. They are bi/.-(-t bv >li.-irp souKjwhat distant 

 spines. Their length and breadth vary, and are re-peelivelv 0'83 and 0'042, 



(ZIJUL. iJIALl.. LXl'. PAiil LXI\'. l<SfO.) S.-^S 33 



