157 



PLATE LXII. 



DESMACIDON JEFFREYSII, Bowerbank. 



Vol. ii, p. 347, ' Mon. Brit. Spongiadse.' 



Isodictya robusta, vol. ii, p. 304, ' Mon. Brit. Spongiadse.' 

 Oceanapia Jeffreysii, Rev. A. M. Norman, ' Rep. Brit. Asoc.,' 

 1868, p. 334. 



Fig. 1. One of the most perfect specimens of the 

 species that has been obtained. It was dredged by 

 the Rev. Mr. Norman at Shetland in the summer of 

 1868. It is firmly attached to a small fragment of 

 stone by five stout, root-like, prehensile organs. 

 Natural size. 



Fig. 2. A small specimen of the species, without 

 any portion of the base. Natural size. 



Fig. 3. A portion of one of the large, terminal, 

 cloacal organs, having a branch projecting from its 

 side. The wart-like bodies opposite a, a, a, are Zoan- 

 thus sulcatus ? Gosse. On the large cloaca of two of 

 the specimens sent to me by Mr. Norman the number 

 of these parasites is very considerable. 



Fig. 4. A portion of the distal extremity of a large 

 specimen of the species from among the fragments 

 sent to me by Mr. Peach, with the remains of eleven or 

 more projecting cloacae. 



Fig. 5. One of the acerate skeleton spicula. X 250 

 linear. 



The general description of this species, p. 347, vol. ii, 

 4 Mon. Brit. Spongiadas,' is correct as far as it goes, 

 but the recent acquisition by the Rev. A. M. Norman 

 of several nearly perfect specimens, and repeated ob- 

 servations of the numerous fragments sent to me by 

 Mr. Peach, have enabled me to add further informa- 



