POLYMASTIA. 33 



and a half inclies in diameter, almost entirely covering 

 the external surface of the flat valve of a Pecten maxi- 

 mus. This sponge has about one hundred and fifty 

 fistulga ; and on the inside of the valve of the Pecten 

 are three or four very thin circular or oval spots of 

 the same sponge in a very young state, before any 

 fistular appendages are developed. 



8. Polymastia conigera. Bow., hi, 192; PL LXXII, 

 figs. 13—16. 



Genus 10. — Haltphysbma, Bow., i, 179; ii, 5. 



(= Squamulina, Ca/rter, but not of SchuUze.) 



1. Halyphysema Tumanowiczii, Bow., ii, 76; i, PI. 

 XXX, fig. 359. 



1866 Halvphysema Twma/nowiczii, O. Schmidt. Zweite Sup- 

 plement d. Spong. d. Adriatischen Meeres, p. 13, pi. i, 

 fig. 13 (copy from Bowerbank). 



1868 MaVyphysema Tvm,anowiezii, Parfitt. Trans. Devon. 

 Assoc. Sci. Lit. and Art., p. 14 (separate copy) ; and 

 Ann. Nat. Hist., ser. v, vol. i (1878), p. 88. 



1870 Sgimmulma scopula, Carter. Ann. Nat. Hist., ser. 4, 

 vol. V, p. 310, pi. iv, figs. 1—11 ; and vol. xx (1877), 

 p. 337; ser. 5, vol. i (1878), p. 172; vol. iii (1879), 

 p. 407. 



1877 Halvphysema primordiale, Haeckel. Biologisohe Stu- 

 dien, p. 180, pi. ix. 



1877 Halvphysema Tumanovncxii, Haeckel. 1. c, p. 192. 



1877 Gastrophysema dithalamium, Haeckel. 1. c, p. 196, 

 pis. xii — xiv. 



1877 Gagtrophysema scopula, Haeckel. 1. c, p. 206. 



1878 Sqwmulina scopula, Kent. Ann. Nat. Hist., ser. 5, 



vol. i, p. 1. 

 1878 Haliphysema Tumamowiczii, Norman. Ann. Nat. Hist., 

 ser. 5, vol. i, p. 274. 

 VOL IV. 3 



