CORNUSPIRA. 



127 



11a 



lib 



12a 



Figs. 11a, 11 ft.— The outer whorls thick and rather wide; inner whorls 

 many and thin ; the inner margins partly overlap the previous whorls. 

 Cornuspira involvens, Reuss, 1849. 



Figs. 12a, 12J.— A few rather wide and thick whorls outside (too thin in 

 fig^ 126) ; inner whorls many and thin. Cornuspira Eeussi, Borneinann, 



is, 3.-,. 



12ft 



3 rz_n mn,i ei t^t j r^~m nr:,i 



13a 



FlGS. 13a, 13ft. — Whorls numerous; the outer whorls slightly wider than 

 the others. Cornuspira poJygyra, Reuss, 1863. 



13ft 



14a 



14ft 



FlGS. 14a, 14J. — Numerous whorls, narrow throughout ; hut the younger 

 whorls are somewhat thicker, especially the last three or four. Cornu- 

 spira angigyra, Reuss, 1849. 



15a 



FlGS. 15a, 15ft. — Whorls few and uniformly wide and thick throughout. 

 Cornuspira pachyyura, Giimbel, 1869. 



155 OODOG 



The last-mentioned form is much like the young Cornuspira, whether " C. 

 involvens" (megalospheric), figured in Brady's 'Challenger' Report, pi. xi, 

 fig. 3, or the young " Spirillina foliacea" (microspheric) in Williamson's 'Recent 

 Foram. Great Britain,' pi. vii, fig. 201. Cornuspira planorbis, Schultze, ' Organism. 

 Polythal.,' 1854, p. 40, pi. ii, fig. 21, and C. foliacea, Moebius, ' Meeresfauna 

 Mauritius, &c.,' 1880, p. 76, pi. ii, fig. 3, appear to be quite the same as Brady's 

 young " C. involvens.'''' 



The Gyclogyra multiplex of Searles V. Wood, 'Ann. Mag. Nat. Hist.,' vol. ix, 

 1842, p. 458, pi. v, fig. 5, is very much like the foregoing forms with whorls of 

 uniform width, except in its large size (| inch). Mr. S. V. Wood refused to place 

 it in Cornuspira, and thought that it was annelidan. 



