On some British PoTyzon. 207 



23"3 ; diastema 11-2 ; palatal foiaraina 9"2 ; length of upper 

 molar series 7*8. 



llah. W. Coast of South Andaman Island, north of Ikd 

 Bay. 



Type. Adult female. B.:M. no. 6. 4. 13. 2. Collected 

 February 1904, and presented by C. G. liogers, Esq. 



In spite of tlie number of rats recently described by 

 Mr. G. S. Miller * from the Andaman group, this fine species 

 does not appear to iiave been previously obtained. Its very 

 unusual mammary formula, 1 — 3 = 8, is alone shared, in the 

 whole of the Muridoc, by Mus bagohus, Meariis, from the 

 Pliilipj)ines, and Mas ])vlliventer. Miller, from tiie Nicobars, 

 of which latter it may be the Andaman rejjreseiitative, but 

 from wiiich it differs by its markedly larger size and distinctly 

 bicolor tail. 



XXXI. — On some British Polyzon. By Canon A. M. 

 Norman, 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 andeyavensis, Micheliii, Icon. Zoophyt. p. 329 (nee auct, 



plur.). 

 1848. Cellepora gracilis, Reuss, Foss. Polyp, des Wiener Tertiarbeckens, 



p. 93, pi. xi. lig. 12 (uec Von Miinster). 

 1854. Membranipora calpensis, Busk, Brit. Mus. Cat. p. 60, pi. civ. 



figs. 5, 6. 

 1867. Memhranipora bifoveolata, Heller, Bryozoen des adriatischeu 



Meercs, p. 19, pi. ii. fig. 1. 

 1871. Membranipora ca/peiisis, Manzoni, " Supp. alia Fauna Rryoz. 



Medit.," Sitz. k. Akad. d. Wiriseiisch. vol. Ixiii. p. 3, pi. i. figs. 2," 3. 

 1879. Micropora impressa, AVaters, Ann. & Mag. Nat. Hist. 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 whether they were given to me. 



Other specimens are in my collection from Naples, whcro 

 I found it in 1887 to be abundant, and from the Adriatic, 

 given to nie by my late friend Professor Heller under his 

 name " Membranipora bifoveoJatay 



* Pr, U.S. Nat. Mus. x.\iv. p. 758 (synopsis of specio.«) (1002). 



