LAGENA LACUNATA. 205 



23. Lagena lacunata, sp. nov., Burrows and Holland. Plate VII, figs. 12 a, b. 



Lagena castkensis, Brady (non Schwager), 1884. Report ' Challenger,' vol. ix, 



p. 485, pi. Ix, figs. 1—3 ? 

 — — BaJkwill and Wright (non Schwager), 1885. Trans. E. I. 



Acad., vol. xxviii (Sci.), p. 341, 

 pi. xii, figs. 20, 21. 



Characters. — Test compressed, nearly circular, tapering slightly towards the 

 oral end, periphery tricarinate ; body of test biconvex ; ornamented externally 

 with shallow pittings irregularly disposed ; aperture ectosolenian and fissural. 



This is a modification of L. Orbignyana (Seguenza), and is distinguished from 

 L. castrensis, Schwager, with which it has been confounded by the authors 

 mentioned above, by the substitution of shallow pittings for exogenous beads. 

 Brady, in the ' Challenger ' Report, describes his specimens as ornamented with 

 " large exogenous beads irregularly scattered over the lateral faces of the test." 

 The figures in his pi. Ix, however, show a surface ornamentation of shallow 

 pittings. We have carefully examined the figured ' Challenger ' specimens which 

 are preserved in the British Museum, and we find that they agree with the plates, 

 and not with the description in the text. We are confirmed in this view by 

 Mr. Hollick, the artist who prepared the ' Challenger ' plates from the actual 

 specimens. 



Messrs. Balkwill and Wright give no description of the specimens mentioned 

 in their paper, but the figures in their pi. xii, which were also drawn by 

 Mr. Hollick, clearly show pittings. Mr. Wright has kindly sent his specimens for 

 our inspection, and we find that they exactly agree with our own examples of 

 L. lacunata. 



This species is approached by Lagena (Entosolenia) varlolata, Schlumberger, 

 and by Lagena (Fissurina) punctata, Seguenza; but the pittings upon both these 

 species are relatively much smaller, and are arranged with marked regularity ; 

 whereas in L. lacunata the pittings are relatively large, few in number, irregular 

 in outline, and irregularly disposed. 



Occurrence. — In the recent condition L. lacunata appears to be somewhat rare. 

 Dr. Brady's specimens were obtained from four ' Challenger' stations, namely, " off 

 East Moncceur Island, Bass Strait, 38 fathoms ; off Raine Island, Torres Strait, 

 155 fathoms; off Amboyna, 15 to 20 fathoms; and the Hyalonema-groxmd, south 

 of Japan, 345 fathoms." It has also been found off the Irish coast, 45 to 50 

 fathoms. 



In our own Collections we have fossil specimens from the Casterlian and 

 Scaldisian formations at the Kattendyk Docks, Antwerp. In the Coralline Crag 



