CORRIGENDA. 



The terminology in Volume I of this work was 

 gradually constructed long Ijefore 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 tlie figures in the 

 Plates of Volume III. 



VOL. I. 



No. 9, vol. i, p. 230, for Halivhondria infunJihuUformis, Joliustuu, 

 read Isodielya infundibuliformls, Bowerbank. 



No. 4i, vol. i, p. 23-1, for Hymeniacodon Bucklandi, read Bat- 

 tershyia BucMandi. 



Nos. 102 — lOS, vol. i, p. 2i5. The spouges whence the fuliato- 

 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, AVcst 

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

 nated i5«c;!yfocflZy.r^o/yfecit6>, ' P. Z. S.,' 18G9, page 90, pi. vi, figs. 10 

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

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

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

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

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

 the spicula represented in plate v, figs. 10-1 — 107, ' Mon. Brit. 

 Spoogiadfe,' in silil 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. 218, for llalichoiidria Ilyndmani, read 

 Isodictya Hijndinani. 



2-f 



