188 BRITISH SPONGIADiE. 



M. Norman, were two small specimens of Pecten varius. 

 One valve of each being nearly covered by a layer of 

 sponge not exceeding half a line in thickness. On 

 mounting a small portion of each in Canada balsam, 

 I found them to be very young specimens of 0. seriata, 

 but in only a partially developed condition. The usual 

 oscula were not apparent, and the defensive spicula 

 based on the skeleton fibres were few in number and 

 -slender in their proportions. AH the spicula charac- 

 teristic of the species were present, but only sparingly 

 so. 



" These specimens are very instructive, as without a 

 careful microscopical examination their species certainly 

 never would have been suspected." 



Suborder IV, i, 209; ii, 15. 



■Genus 31. — Verongia, Boiv., i, 209; n, 16. 



Verongia Zetlandica, Bow., ii, 380; iii, 177, PI. 

 LXX, figs. 9—14. 



1870 Cacospongia Zetlandica, Schmidt. Spong. Atlant. Geb., 

 p. 77. 



Suborder VII, i, 211 ; ii, 16. 



Oenus. 32. — Dtsidea, Johnston, ii, 16. 



1. Dtsidea fragilis (Montagu), ii, 381 ; i, PI. XIV, 

 figs. 270—272 ; iii, PI. LXIX. 



1870 Spongelia fragilis, Schmidt. Spong. Atlant. Geb., p. 77. 

 1876 Dysidea fragilis (in 312 fathoms), Cai-ter. Ann. Nat. 

 Hist., ser. 4, vol. xviii, p. 232. 



