24 G. LINDSTRÖM, ACTINOLOGY OF THE ATL. OCEAN. 
52.  Dendrophyllia Goösi n. 
PESINY HOS 207-42! 
Off St. Martin in 40—150 fathoms (Gois). 
This species has not yet been found in regular, branching polyparies formed by 
gemmation, whence there may be some uncertainty, whether to place it amongst the 
Balanophyllixe or the Dendrophylliz'). There are only small specimens attached to the 
larger ones on their epitheca. The largest specimen has 40 millim. in length, breadth at 
the caliecle 13 millim. The basis is broad and spreads out over its support. It has quite 
the same squamose, cellular structure which is prevalent in other Dendrophyllie. A 
little above this basal portion some costal strix are visible, smooth or only faintly 
projecting, often united by the same sort of scaly covering as at the basis. Calicle 
elliptical (13 millim. in one direction and 11 millim. in the other) and very deep (13 
millim. from the border). The columella is narrow, spongious, only slightly elevated 
and fills the whole bottom. In the smallest specimen I have, seen (2 millim.) there 
are twelve septa; six primary ones, more pointed and shorter than the secondary ones, 
which are lower and join in three pair around the interior border of three of the 
former. As may be seen by fig. 41 there is evidence that also the remaining three 
primary septa become in the same way enclosed. 'These are thus hemmed in by the 
secondary ones, which continue in a single lamina from their point of junction. In larger 
specimens there are six systems and five cycles. The .septa of the first two cycles are 
lamellar, thin, imperforated, interior edge entire, without indentations and the lateral 
surfaces almost smooth without any tubercles, only showing regular lines of growth. 
In comparing an adult specimen (fig. 42) with younger ones (figs. 40 & 41) it is evident 
that the six primary septa in the young not are identical with the six septa of the first 
cycle or order in the adult, as the former have been arrested in their development and 
have been supplanted by younger ones. Very thin septa were entirely dissolved in 
diluted acetic acid, without leaving the least trace of any organic membrane behind. 
As to the soft parts of the animal it may be remarked that the basis of the 
tentacles, where they cover the superior border of the septa is almost entirely cluste- 
red with parcels of nematocysts, each parcel sheltered within a rhomboid cavity with 
hyaline walls. Such parcels of nematocysts form the peculiar warty surface, seen on 
the tentacles of so many Caryophyllie. This species differs from other Westindian 
Dendrophyllix by its smooth, not exsert septa and its very narrow and depressed 
columella. 
53. Madrepora prolifera E. H. 
Porto Rico (HJALMARSON). 
54. Madrepora flabellum LAwMK. 
Bartholomew, very common. 
55. Porites clavaria LAMK. 
Bartholomew. 
56. Porites (Neoporites) astreoides LAmMK. 
Bartholomew. 
') It is questionable whether there really is any difference belween these two genera, as the only distinctive 
character is that trifling one of Balanophyllia containing simple species and DPendrophyllia compound ones. 
