FOR AMINIPER A— HERON-ALLEN AND EARLAND. 91 



and blunt, to the other extremity, which, in all the specimens found, is more or 

 less ragged and unfinished. The spicules are cemented neatly side by side with a 

 very thin layer of colourless cement, the whole test glistening, owing to the exposed 

 surfaces of the spicules, which are only one layer deep. The aboral extremity of the 

 test presents no visible aperture, but is probably coarsely perforate, as nearly all the 

 examples exhibit dried protoplasm projecting upon the surface from the extremity. 



Abmidant at Station 2, a few specimens at Station 3, and a single individual 

 at Station 6. 



Whether the organism is perfect, or merely a fragment of some larger 

 growth, we cannot say. The ragged, unfinished ends which characterize all the 

 specimens would at first suggest that they were broken, but on the other hand, 

 no trace has been found of a corresponding fragment showmg a finished extremity. 

 The extrusion of protoplasm from the closed extremity exhibited by most of the 

 specimens may perhaps indicate that the organism anchors itself to some host 

 witliout becoming definitely sessile, but only one specimen affords evidence in 

 support of this theory, where the organism is attached to the branching tube 

 of a Zoophyte. Chapman, in his Ross Sea Paper, figures and describes {ut supra) 

 a specimen which appears to us to be identical with our form and which cer- 

 tainly does not appear to be referable to M. cylindrica. He does not give the 

 dimensions of his specimens, but unless his paper is misprinted, they must have 

 been of enormous size, far surpassing anything we have seen — the breadth of 

 the widest end of one of his specimens is given at 13 mm. If this is a mis- 

 print for 1-3, it brings it roughly into agreement with the size of our specimens, 

 which we take this opportunity of associating with his name. 



The size is very variable. The largest fragment measured 11 -20 mm. in 

 length, and was -50 mm. l)road at the initial end and -80 mm. in diameter at 

 the fractured extremity. 



RHABDAMMINA, Brady. 



100. Rhabdammina abyssorum, M. Sars. 



Rhabdammina abyssorum, M. Sars, 1868, LUHD. p. 248 (nowpii inuJinii). 



Cushman, 1910, etc., FNP. 1910, p. 2i, figs. 8-10. 



Stations 6, 8, l(i, 21, 22, 29, 31, 32, 34, 38, 42, 43, 52. 



Fragments attributable to Rhabdammina, species indeterminate but almost 

 certainly referable to R. abyssorum, occur at many Stations. 



101. Rhabdammina discreta, Brady. 



Rhahdojileura abyssorum, G. M. Dawson, Canad. Nat. 1870, vol. v.. p. 177. figs. 6 (7 in plate). 

 Rhabdammina discrela, Ciishnian, 1910, etc., FNP. 1910, p. 27, fig. 1.3. 



Station 6 (-f D.). 



A single very large specimen, utilizing sponge-spicules. The species was 

 figured by Ct. M. Dawson in 1870 {ut supra) as Rhabdophura abyssorum, but the 



N 2 



