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). 



