Mr. H. J. Carter on a new Species of Foraminifera. All 



smooth, fusiform, transparent, solid, calcareous spicules, whose 

 ends are sharp-pointed or round ; varying in size from those 

 of the primary chambers, Avhich are about 2 by ^-1 800th, to 

 those of the outer ones, which are 5 by 2-1800ths inch in 

 their greatest diameters respectively ; arriving abruptly at 

 their largest dimensions in the third whorl of chambers, beyond 

 which they do not appear to increase in size (PI. XVI. fig. 2) ; 

 the whole so interwoven and cemented together by a minutely 

 areolated, calcareous, crystalline, but white-looking structure 

 (fig. 3, c) , as to form a thin, delicate wall to each of the cham- 

 bers, whose cavities respectively are either partially empty or 

 filled with the dried animal, as before stated (fig. 2, a, i, c) , 

 Size of entire test about l-15th inch in horizontal diameter 

 (fig. 1) ; vertical diameter almost inappreciable from its ex- 

 treme thinness and the adherence of the lower surface to the 

 object on which it has grown ; diameter of the primary or 

 embryonal chamber 2-1800ths of an inch. 



Hah. Marine, on the base of Oculina rosea=^ Stylaster san- 

 guineus. 



Log. East Oceania. 



Ohs. This remarkable Foraminifer, of which I have only 

 one specimen, was found accidentally on a small fragment of 

 the base of a specimen of Stylaster sanguineus in the British 

 Museum, and therefore, if sought for specially, will probably 

 (like the fixed Rotalians generally) be met with more or less 

 abundantly about similar objects from the same region. 



The rotalian characters and spicular composition of the test 

 respectively suggest the name ; but being adherent to the 

 surface on which it is situated, the position of the aperture, 

 like that of Rotalia^ is inferred to be inferior, as none can be 

 observed on the upper part. There seems to be no particular 

 arrangement of the spicules, which as often cross each other 

 as they are seen to be only one layer deep, and, with refer- 

 ence to their relative position, lie in all possible directions, 

 seldom appearing above the level of the surface, although 

 evincing, by the occasional projection of one end, or their 

 entire separation about some part which has been broken 

 (like that of the chamber, fig. 2, a), the form above described ; 

 while the largest belonging to the outer wliorls of the 

 chambers, being in length more than twice the diameter of 

 the central or embryonal cell, which is composed of similar 

 spicules only much more minute, show that their size has 

 been increased with the growth of the test, and therefore that 

 they have been formed by the animal, and not brought to it 

 from some other organism. Moreover they are precisely like 

 those seen in the marginal cord and over the septal spaces of 



