508 PROF. A. DENDY AND MJSS L. M. FREDERICK ON 
41. Spirastrella vagabunda Ridley. 
Spirastrella vagabunda Ridley [1884]. 
(For literature and possible synonymy vide Dendy [1905] and Vosmaer [1911].) 
The larger o£ the two specimens, which measures about 60 by 20 by 
25 mm., is elongated and tubular, with a hollow digitiform process (which 
has been cut off) arising fi'om one end. Two large, irregularly shaped vents 
are present, and inhalant pore-sieves are visible over a small portion o£ the 
smooth but uneven surface. The second specimen is a small tubular fragment 
with thick walls. Colour in spirit light brown ; texture firm and compact. 
The skeleton arrangement and spiculatioa agree closely with those of the 
type. 
The Abrolhos specimens come very close to Spirastrella vagabunda var. 
tuhulodigitata Dendy [1905], but the tylostyles of the former are shorter 
and stouter. 
Previously known Distrihtdion. Torres Straits [Ridley) ; Indian Ocean 
(^Dendy). 
Register Nos. and Locality. VI. 10, VI. 15 a, Sandy Isle. 
42. Aaptos aaptos (Schmidt). 
Ancorina aaptos 0. Schmidt [1864]. 
Aaptos adriatica Gray [1867]. 
Ancorina na])tos O. Schmidt [1868]. 
Trachya pernucleata Carter [1870]. 
Tuberella tethyoides Keller [1880]. 
TethyopluBna silifica O. Schmidt [1880]. 
Tuberella tethyoides Vosmaer [1887]. 
Aajitos adriatica Vosmaer [1887]. 
Amorphina Ducliassainyi Topsent [1889]. 
iSuberites spissus Topsent [1892]. 
Tuberella Duchassaingi Topsent [1894], 
Tuberella tethyoides Topsent [1896]. 
Suberites aaptiis Lendenfeld [1896]. 
Suberites aaptus Topsent [1898]. 
Tuberella aaptos Topsent [1898, 1900J. 
Tuberella aaptos Wilson [1902]. 
Tuberella aaptos Hentschel [1909, 1912]. 
Tuberella aaptos Dendy [1916 A]. 
Tuberella aaptos Babic [1922]. 
The larger of the two specimens (R.N. III. 5) is "irregularly subspherical, 
measuring 45 by 25 by 30 mm. ; at one end, in a slight depression, lies a 
small group of oscula, and three or four small round oscula are scattered 
singly over the sub-glabrous upper surface. Colour in spirit dark brown 
outside, light brown inside ; texture compact but compressible. 
The other specimen (R.N. VI. 12 6) is a small, light-brown fragment 
25 mm. in length, 15 mm. in breadth, and 8 mm. in thickness, with a flat, 
sub-glabrous upper surface, in the centre of which is a single slit-like 
