CORRIGENDA. 



THE terminology in. Volume I of this work was 

 gradually constructed long before the systematic ex- 

 amination of the species was effected, and during the 

 latter portion of the work in Volume II, many correc- 

 tions became necessary in the names of both genera 

 and species. I have therefore thought it advisable to 

 record these alterations for the information of students 

 who will find all such corrections by reference to the 

 series of numbers descriptive of the figures in the 

 Plates of Volume III. 



VOL. I. 



No. 9, vol. i, p. 230, for Halichondria infundiluliformis, Johnston, 

 read Isodictya infundibuliformis, Bowerbank. 



No. 44, vol. i, p. 234, for Hymeniacodon Bucklandi, read Bat- 

 tersbyia Bucklandi. 



Nos. 102 108, vol. i, p. 245. The sponges whence the foliato- 

 peltate spicula were obtained were not known at the time of the 

 publication of vol. i; since then I have had the opportunity of 

 examining and describing many specimens of siliceo-fibrous sponges, 

 in the ' Proceedings of the Zoological Society of London,' and in the 

 expansile dermal system of one of them, from St. Vincent, West 

 Indies, in the collection of the British Museum, which I have desig- 

 nated Dactylocalyx poly discus, ' P. Z. S.,' 1869, page 96,. pL vi, figs. 10 

 and 11, I have found the peltate spicula in situ, which are evidently 

 the same as those represented in vol. i, ' Mon. Brit. Spougiadse,' 

 plate iv, figs. 102 and 103, and probably fig. 108, plate v. In 

 another sponge, in the collection of the British Museum, from St. 

 Michael's, Azores, presented by Robert McAudrevv, Esq., I found 

 the spicula represented in plate v, figs. 104 107, ' Mon. Brit. 

 Spongiadae,' in situ in the expansile dermal system. These spicula 

 are represented in plate v, figs. 3 5, ' P. Z. S.,' 1869. 



Nos. 123 127, vol. i, p. 248, for Halichondria Hyndmani, read 

 Isodictya Hyndmani. 



24. 



