Cyclostrema, AdeorMs, Vitrinella, and related genera. 109 



In 1861 (Ann. Mag. Nat. Hist., vol. viii, p. 244), A. Adams stated: 

 " The very remarkable shell described by me as Cyclostrema spirula 

 (P. Z. S., 1850) is neither a Spira nor a Serpularia and the name of 

 the subgenus may therefore be changed to Daroniay 



I have been unable to consult Sowerby's Thes. Conch., 1864. 

 Fischer used Daronia as a section of Cyclostrema, but his conception 

 of that genus was in its most extended sense. 



Serpularia was used by Munster (1840) for a genus of annelids, 

 and by Romer (1843) for a group of shells, some of which have 

 been found to be annelid tubes. Fischer, however, retained it as a 

 questionable genus (Manuel, pp. Yie, 830), and gave S. centrifuga 

 Romer, as an example. 



Spira Brown, 1838. 



" Shell smooth, nearly globular or semiovate ; spire small in pro- 

 portion to the size of the body, and depressed ; aperture enveloping 

 the body, 2d ed. 111. Cat. Gt. Britain, p. 20. 



This genus was proposed by Brown for a group of seven of Mon- 

 tagu's species of Helix, all of which, with the exception of variegata, 

 he had included in his genus Delphinoidea, 182Y. They are doubt- 

 less only larval shells. 



Fischer recognized the genus in Journ. de Conch., pp. 45 and 51, 

 1877, but I find no mention of it in his Manuel, nor do I find that it 

 has been recognized by other authors. 



Tubiola A. Adams, 1863. Type, T. cormella A. Ad. St. of Korea, 63 fathoms. 



"Shell somewhat unrolled or loosely coiled; whorls simple, round, 

 with concentric striae ; aperture somewhat circular, peritreme con- 

 tinuous, margin sharp, entire." 



Type, T. cornuella A. Ad. Figured in Thes. Conch., copied by 

 Try on. 



" Shell somewhat discoid, oblong-ovate, thin, yellow-brown, widely 

 umbilicate, apex raised ; whorls 3^, rapidly enlarging, round, the 

 last free at the peritreme ; with conspicuous incremental strise ; 

 aperture oblique, transversely ovate ; peritreme continuous, sharp, 

 entire, expanded." Ann. and Mag. Nat, Hist,, v, p, 412, 1860. 



The only change that is made in the description of the more adult 

 specimen is in the color, which is given as " dirty white." 



" In this species, which I described from a young individual as a 

 Skenea in Ann. Mag. for 1860, the whorls are disunited, but the 

 volutions are not rolled on the same plane as in Daronia spirula." 

 P. Z. S., p. 74, 1863. 



