CORNUSPIRA. 



127 



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

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

 Cornuspira involvens, Eeuss, 1849. 



Fl8S. 12o, 12J.— A few rather wide and thick whorls outside (too thin in 

 fig- 12i) ; inner whorls many and tliin. Cornuspira Meussi, Bornemann, 

 1855. 



126 > ■ ■tr-T^in-nF7?-7inCTrTO^ tggronmm^ 



oo 



i« OOODoooOOOO 



Figs. 13o, 134. — Whorls numerous; the outer whorls slightly wider than 

 the others. Cornuspira polygyra, Reuss, 1863. 



Figs. 14a, 14i. — Numerous whorls, narrow throughout; but the younger 

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

 spira angigyra, Reuss, 1849. 



Figs, locr, 15S. — Wliorls few and uniformly wide and thick throughout. 

 Cornuspira pachygyra, Giimbel, 1869. 



15* 0000303 



The last-mentioned form is mucli like the young Conmsjjira, whether " G. 

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

 fig. 3, or the young " SjnriHinafoUacea" (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 G. foUacea, Moebius, 'Meeresfauna 

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

 young " G. involvens." 



The Gyclogyra multi2:)lex 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 (y inch). Mr. S. V. Wood refused to place 

 it in Gornuspira, and thought that it was annelidan. 



