General History of the Marine Polyzoa. 257 



Loc. Bass's Straits (Copt. Warren) j Tahiti (both forms) ; 

 New Zealand (both forms) ; New-Zealand Tertiaries, var 

 {Miss Jelly) . 



Note. — Since the foregoing was in type I have received a 

 paper from Mr. MacGrillivray, in which he notices several 

 variations in the pore of Microporella diadema. 



EXPLANATION OF THE PLATES. 

 Plate VII. 



Fig. 1. Schizoporella circinata, MacGillivray. Zocecia, showing- the avicu- 

 laria and the suhoral ridges. [The punctures are represented as 

 distributed over the whole surface of the cell ; but in reality the 

 central portion is destitute of them and perfectly smooth, as in 

 figure 1 «.] 1 a. Cell with ocecium. 



Fig. 2. Membranipora valdemunita, n. sp. 2 a. Cell with ooecium. 



Fig. 3. Schizoporella biserialis, n. sp. 



Fig. 4. Microporella Malusii, Audouin, form disjuncta, n. 



Fig. 5. Membranipora Mans, u. sp. 



Fig. 6. Membranipora acuta, n. sp. 6 a. Cells with ooecia. [The bi- 

 lobate appearance of the ovicell seems to be a mere abnormal 

 peculiarity ; it does not occur generally.] 6 b. Cells, showing 

 the prolongation below the area. 



Plate VIII. 



Fig. 1. Lepralia subimmersa, MacGillivray. 1 a. Ocecium. 



Fig. 2 a. Diachoris Magellanica, Busk. Cell with avicularia. 2 b, 2d. 



Avicularia, showing structure. 2 c. Orifice, closed and open. 

 Fig. 3. Microporella diadema, MacGillivray, form angustipora, n. 3 a. 



Normal. 

 Fig. 4. LJippothoa ? sp., showing the secondary cells. 

 Figs. 5, 5 a. Schizoporella cribril/ifera, n. sp. 

 Fig. 6. Lepralia cincta, n. sp. 6 a. Ocecium. 

 Fig. 7. Membranipora trifolium, Busk, form minor, Hincks. 



Plate IX. 



Fig. 1. Diachoris elongata, n. sp. 1 a. Avicularium. 



Fig. 2. Diachoris quadricornuta, n. sp. 2 a. Avicularium. 



Fig. 3. Diachoris spinigera, MacGillivray. Avicularium. 



Fig. 4. Diachoris costata, Busk. a. Marginal avicularium. b. One of 

 the small avicularia on the inner cells. 



Fig. 5. Schizoporella lucida, n. sp. 5 a. Zooecium, showing the form of 

 the primary orifice and the suboral processes. 



Fig. 6. Schizoporella argentea, Hincks. A cell showing the arrano-ement 

 of the granules on the surface, the form of the avicularium, and 

 two of the intercellular perforations. 6 a. The dorsal surface of 

 the zooecium. 



Fig. 7. Schizoporella scintillans, n. sp. 7 a. Ooecium, showing the screen- 

 like lobe in front. 7 b. Pointed avicularium. 



Fig. 8. Lepralia gigas, n. sp. [This figure is drawn to a much lower scale 

 than the rest.] 



Fig. 9. Lepralia vesiita, n. sp. 



