214 Mr. A. Gr. Butler on new Species of 



as plentiful and as varied in the Carboniferous age as at any 

 other time. 



It would be worth while, when the opportunity offers, for 

 some one to look over the weathered surface of the strata in 

 the mountain of Ben Bulben, where fragments, if not entire 

 specimens, of sponges from which the spicules come might 

 be found, after the manner that they have been discovered in 

 the Carboniferous system in the south-west of Scotland. 



EXPLANATION OF PLATE XIV. B. 



Fi;/. 1. Holusterella Wrightii, spicule of, nat. size. The largest met 



with (diagram). 

 Fig. 2. The same, restored, to show the perfect form with spiral inflation 



on the arms. Magnified 7 diameters. 

 Fir/. 3. The same. Furcate arm, much more magnified, to show— «, the 



simple spiral inflation, and b, the same when " broken up." 



Scale l-48th to l-1800th inch. 

 Fi(js. 4, 5, 6, and 7. The same, to show the simple sexradiate and mul- 



tifid divisions of the arms respectively (diagrams). 

 Fig. 8. Sarcohexactinellid. Fragment of large surface-spicule of un- 

 known species. 

 Fig. 0. The same. Free end of anchoring-spicule. 

 Fig. 10. Lithistid. ? Tripod-like surface-spicule of unknown species. 

 Fig. 11. The same. Lateral view. 

 Fig. 12. The same. Dendritically branched surface-spicule of unknown 



species. 

 Fig. 13. The same. Form of body-spicule of unknown species. 

 Fig. 14. Reniera ?. Sausage-shaped spicule of unknown species. 

 Fig. 15. Acerate spicule of unknown sponge. 

 Fig. 16. The same. 

 Fig. 17. Quadriradiate fragment of spicule of unknown sponge, 



N.B. Figs. 3 and 8-17 inclusively are all drawn to the 



scale of l-48th to l-1800th inch. 



XXVIII. — Descriptions of new Species of Asiatic Lepidoptera 

 Heterocera. By. Arthur G. Butler, F.L.S., F.Z.S., &c 



[Continued from p. 129. J 



38. Thalassodes opalina, sp. n. 



Wings semitransparent, emerald-green, striated all over 

 with white and with opaline reflections : primaries crossed in 

 the middle by a straight transverse slender white line; a 

 shorter and less-defined line towards the apex ; costal margin 

 yellow, fringe tipped with yellow : secondaries angulated, a 

 slender angulated white line beyond the middle, sinuated 

 below the angulation ; basal half of subcostal vein yellow, 

 fringe tipped with yellow : antennse white at base, golden 



