On some British Polyzon. 207 23'3 ; diastema 14*2 ; palatal foramina 9*2 ; length of upper molar series 7' 8. Hob. W. Coast of South Andaman Island, north of Ik^ Bay. Type. Adult female. B.M. no. 6. 4. 13. 2. Collected February 1904, and presented by C. G. Rogers, Esq. In spite of the number of rats recently described by Mr. G. S. Miller * from tlie Andaman group, this fine species does not appear to have been previously obtained. Its very unusual mammary formula, 1 — 3 = 8, is alone shared, in the whole of the Muridee, by Mus bagobus, Mearns, from the Philippines, and Mus pulliventer.^ Miller, from the Nicobars, of which latter it may be the Andaman representative, but from which it differs by its markedly larger size and distinctly bicolor tail. XXXI. — On some British Polyzoa. By Canon A. M. NOKMAN, M.A., D.C.L., LL.D., F.R.S., F.L.S. [Plate IX.] Micropora impressa (Moll). (PI. IX. figs. 1-3.) 1803. Eschara impressa, Moll, Eschara, p. 51, pi. ii. fig. 9, 1841. Eschara andegavensis^ Michelin, Icon. Zoophyt. p. 329 (nee auct. pliir.). , 1848. Cellepora gracilis, Eeuss, Foss. Polyp, des Wiener Tertiarbeckens, p. 93, pi. xi. fig. 12 (nee Von Miinster). 1854. Membranipora calpensis, Busk, Brit. Mus. Cat. p. 60, pi. civ. figs. 5, 6. 1867. Membranipora bifoveolata, Heller, Bryozoen des adriatischeu Meeres, p. 19, pi. ii. fig. 1. 1871. Membranipora calpensis, Manzoni, " Supp. alia Fauna Bryoz. Medit.," Sitz. k. Akad. d. Wissensch. vol. Ixiii. p. 3, pi. i. figs. 2, 3. 1879. Micropora impressa^ Waters, Ann. & Mag. Nat. Plist. ser. 5, vol. iii. p. 123. I have recently found among material put by for further examination a little box which contained three small pieces of the above Polyzoon, and labelled Guernsey. I cannot recall to mind whether I procured these specimens myself at Guernsey in 1865 or whetlier they were given to me. Other specimens are in my collection from Naples, where I found it in 1887 to be abundant, and from the Adriatic, given to me by my late friend Professor Heller under his name " Membranipora bifoveolata.''^ * Pr, U.S. Nat. Mus. xxiv. p. 758 (synopsis of species) (1902).
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