KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. å4. N:o 6. I1 
large primary ones, forming the characteristic star, with smaller ones between them. 
In others the coste are of equal size, meeting in the centre, where a small tapering 
apex points down. Ör there is a central space, quite free of all coste, a scar, as it 
were, marking the former extent of the attached surface. All are ornamented in the 
same way as the Westindian specimens with small irregular granular points. As to 
the calicular surface there are still greater variations. In all varieties there is a strongly 
developed Fungian character in the coalescence of the septa of a younger order with 
those of an older. Those of the 4' and 5 orders coalesce with those of the third 
and these again with the secondary septa. In the Westindian D. calcar there is a pe- 
culiar formation of a sort of paluli near the basis of the septa of the second to the 
fifth orders inclusive and these paluli also unite towards the centrum of the coral, 
broadly bridging over the subjacent interseptal spaces. The paluli of the first order 
are very large, angular, wider at their crest than at their basis, and somewhat bent 
towards one side. The columella consists of tapering points. The whole interior part 
of the paluli and their excrescencies 1s white, whilst all septa of the second order and 
the paluli of the first septa are brown. Now there are East Atlantic specimens which 
are attached, but show the same arrangement and configuration of septa and paluli as 
the last mentioned Westindian ones. But commonly they have the septa not so dense, 
nor are the paluli so large, and the walls are also very thin. Such specimens resemble 
very much BSabinotrochus apertus DUNCAN and it is probable that they are identical. 
Besides these there is an abnormal form with very thick borders and rather more elon- 
gated than the others, 12 millim. in breadth and 3 millim. in height, another specimen 
10 millim. in breadth and 5 millim. in height, whilst the common variety attains 6 
millim. in breadth and only 2 millim. in height. In old specimens this cupshaped 
form is much exaggerated by their being often deeply excavated through erosion. 
In the smallest specimen I have seen, of only 0,7 millim. there are four septa of 
the first order, towards each of which two of the second order are growing and with these, 
again, the smallest belongimg to the third order unite. But to judge by a specimen, 
which is a little bigger (1,5 millim.) and has six regular septa of the first order, the 
law of substitution, as expressed by LAcCAzE-DUTHIERS (Arch. de Zoologie expérimen- 
tale Tome I, page 368) comes into play and of the six apparently primary septa four 
may have been developed out of secondary ones, only two of the original four resting 
in their old position as septa of the first order, the two others being, as it were, pushed 
aside and degraded into secondary ones. 
9. Sphenotrochus auritus POURTALES Var. 
ELILI mo DIT 22: 
Off St. Bartholomew in 12 fms (Gois) and off Tortola (CLEVE). 
It is regularly conical, compressed without any excrescencies at the basal parts 
and seems to be identical with the variety described by PourtarEs (Hassler Exped. 
p- 37) from Brazils and which he considers as the young ones of the others. In con- 
sequence of the great variation amongst the corals especially as to their exterior shape 
