90 Bibliographical Notice. 



cells are more raised above the crust and tubular than those of 

 the latter species. Here and there among the open-mouthed 

 cell-tubesj there occurs a tube which, instead of being open, is 

 closed above with a little cap, from one side of the centre of 

 which rises an umbonal-like process which is perforated at the 

 apex (PI. XL fig. 6). Probably these organs are connected with 

 the reproduction of Diastopora, and are homologous with ovi- 

 cells. 

 Dredged off Guernsey and Jersey, in 1859. 

 Sedgefield, Dec. 21, 1863. 



DESCRIPTION OF THE PLATES. 



Plate IX. 

 Fig. 1. Eudendrium annulatum (Norman). The hydrozoon of the natural 



size. 

 Fiff. 2. The extremity of a branch of the same species, magnified to show 



the structure of the branches, the polypites, and the gono- 



blastidia. 

 Fiff. 3. A portion of one of the larger stems of the same species, showing 



the curious network of tubes with which they are strengthened. 

 Fig. 4. Tubiclava Cornucopice (Norman). The hydrozoon on a shell of 



Astarte sulcata : of the natural size. 

 Fig. 5. A portion of the same, magnified, and showing the structure of the 



several parts of the species. 



Plate X. 

 Fig. 1. Rhizoxenia alhicolor (Norman), enlarged. 

 Fig. 2. Lepralia venusta (Norman), 

 Fig. 3. A single cell of the same, viewed laterally. 

 Fig. 4. Lepralia complanata (Norman). 

 Fig. 5. Lepralia laqueata (Norman). 

 Fig. 6. Lepralia divisa (Norman). 



Plate XI. 

 Fig. 1. Lepralia polita (Norman). 

 Fig. 2. Lepralia microstoma (Norman). 

 Fig. 3. Membranipora sacculata (Norman). 

 Fig. 4. Diastopora Sarniensis (Norman) : natural size. 

 Fig. 5. A portion of the same species, magnified. 

 Fig. 6. A few cells and ovicells more highly magnified. 



BIBLIOGRAPHICAL NOTICE. 



Flora of Surrey ; or, a Catalogue of the Floicering Plants and Ferns 

 found in the County, with the Localities of the rarer Species. 

 From the Manuscripts of the late J. D. Salmon, F.L.S., and from 

 other Sources. By J. A. Brewer. 12mo. London : John Van 

 Voorst, 1863. 



The preparation and publication of local Floras in England has 

 recently undergone a change. Formerly it was thought sufficient to 

 form a complete list of the plants observed in a county or other 



