1:24 MR F. GORDON PEARCEY ON 



Apertures minute, situated at the peripheral ends, closed in by very fine argillaceous 

 material. Colour, light gray with a yellowish tint. Diameter, one-sixth of an inch 

 (4 mm.). 



The general contour and minute character of the test of this species are, with the 

 exception of the size of the arenaceous particles of which .the walls of the test are built 

 up, similar to S. fragilissima (BRADY). 



Two specimens of Syringammina minuta were obtained from Station 420, 2620 

 fathoms, one being badly damaged owing to the excessively fragile nature of the test, 

 which consists of a network of branching tubes more or less contorted and irregularly 

 disposed (fig. 2). These are generally filled with dark olive or yellowish-green granu- 

 lated sarcode similar to that found in the tests of the larger arenaceous Foraminifera. 



The external diameter of the tubes varies somewhat, with a maximum of -^ inch 

 (0'5 mm.). Their external surface is fairly smooth ; the interior is quite smooth and 

 well finished. The walls are very thin, averaging about ^^ inch (0'08 mm.). 



It is worthy of note that similar arenaceous forms were collected by the Challenger 

 at a depth of 1000 fathoms off the Azores, but they were so fragile that, in washing the 

 mud through sieves, they were broken to fragments and lost sight of, their character at 

 that time not being known. Careful searching and preservation in future deep-sea 

 dredging and trawling will probably bring additional specimens to light for further 

 investigation. 



Genus RHABDAMMINA, M. Sars. 



Rhaljdammina discreta, H. B. Brady. 



Fine, well-developed specimens, in their typical form, were obtained in plenty at 

 Station 420, 2620 fathoms, glacial mud; and a few at Station 468, 2700 fathoms, 

 Globigerina ooze. This species has a wide range of distribution, having been recorded 

 from the North and South Atlantic, from the North, South, and Western Pacific, in 

 depths of from 350 to 2475 fathoms; off Kerguelen, 120 fathoms; and off the coast 

 of Greenland, at a depth of 20 fathoms. 



Rhabdammina cornuta, H. B. Brady. 



This species was represented very rarely in the material examined from Station 420, 

 2620 fathoms. 



Rliabdammina abyssorum, M. Sars. 



This interesting species, in the typical form bearing the three radiating arms, with 

 the walls of the test coarsely built exteriorly, and of a darkish blue-grey colour, was 

 obtained at Stations 313, 337a., and 417 more abundant at 337c< than at the other two. 

 It has a world-wide distribution, and is found off the coast of Spitsbergen in great 

 quantities ; its range of depth is from 71 to 2439 fathoms. 



(ROT. soc. EDIN. TRANS., VOL. XLIX., 998.) 



