EEPOKT ON THE TETEACTINELLIDA. 
205 
The following species are referred to the Theneidse : — 
Stelletta agariciformis, 0. Sch., Spong. Atlant. Gebiet., p. 68, 1870. 
Stelletta scahra, 0. Sch., Spong. Adriat. Meer., Suppl., iii. p. 19 (probably). 
Stelletta nux, Selenka,^ regarded by Vosmaer^ as a Stelletta, but not by Eidley, who 
regards it as a Tethya^ is really, as slides of mounted spicules presented by Selenka to 
Dr. E. Perceval Wright prove, a species of Geodine sponge, nearly related to Cydonium 
globostellata, Carter, or Cydonium eosaster, Sollas, with one of which indeed it may be 
identical. 
Stelletta bacca, Selenka,^ which Vosmaer correctly excludes from Stelletta, while Eidley® 
includes it, is, as mounted preparations show, identical with Tetilla m&rguiensis. Carter. 
Ancorina aaptos, 0. Sch.,® is a Suberite. Schmidt in one of his latest writings^ 
admits that it must be excluded from the Tetractinellida. 
Ancorina sigmatophora, 0. Sch.® A slide bearing mounted spicules of this sponge 
was kindly sent me by Dr. Zeigler, but did not reach me in time for notice in its 
proper place ; it is evidently a member of the TetUlidee, and probably allied to Tetilla 
australiensis. Carter, or Tetilla merguiensis. Carter. It possesses two forms of 
microsclere, one the usual sigmaspire, and the other a microxea, the megascleres include 
an oxea, protrisene, and anatrisene. 
Ancorina pachastrelloides, 0. Sch.,® would appear to belong to the Pachastrellida, but 
like Ancorina sigmatophora, it is insufficently characterised. 
Appendix to the Ehastrosa. 
Family Epipolasid.®}. 
Genus Asteropus}'^ n. gen. 
Epipolasidse resembling Stryphnus, from which they differ only by the absence of a 
trisene. 
Asteropus simplex (Carter). 
Stellettinopsis simplex., Carter, Ann. and Mag. Nat. Hist., ser. 5, vol. iii. p. 349, pi. xxviii. 
figs. 16-18, 1879. 
Sponge. — Massive, convex, lobate, sessile ; surface even, irregularly undulating ; 
oscules grouped in a depression on the lower surface. 
^ Zeitschr.f. wiss. Zool., '&A. xvii. p. 569, pi. xxxv. figs. 11-13, 1867. 
2 Bronn’s Tfiierreich, Porifera, p. 319. ® Voyage of the “Alert,” p. 472, footnote. 
^ Zeitschr.f. wiss. Zool., loc. cit, pi. xxxv. figs. 14, 15. ® Loc. cit., p. 472. 
® Spong. Adriat. Meer., Suppl., p. 17, 1864, ^ Zeitschr. f. wiss. Zool., Bd. xlii. p. 641, 1885. 
® Spong. Atlant. GeMet., p. 67, 1870. ® Ibid., p. 68. “ aartpawe;, starry. 
