DESCRIPTION OF THE FOSSILS. 
199 
Millepora flustriformis Martin Pet Derb. 43 and 45 * is perhaps the same species, 
but his figures are too imperfect to decide. (Middleton and Buxton.) It resembles 
retepora antiqua, Goldfuss ix. 10. 
R. irregularis. Ph. PI. I. fig. 21, 22. Florence Court. 
Fenestrules oval ; interstices somewhat irregularly set with few large oval pores. 
R. tenuifila. Ph. PI. I. fig. 23, 24, 25. Florence Court. 
Interstices and dissepiments thin ; fenestrules rectangular ; pores (fig. 25) small 
with prominent edges ; reverse (fig. 24) striated. 
R. undulata. Ph. PI. I. fig. 16, 17, 18. Harrogate; Bolland ; Hawes. 
Interstices very thin ; fenestrules large irregular ; pores large prominent ; reverse 
striated. It resembles gorg. antiqua, Goldfuss xxxvi. 3, but is distinct. 
R. nodulosa. Ph. PI. 1. fig. 31, 32, 33. Whitewell in Holland ; Green- 
how hill ; Harrogate. 
Radiating, ramifying ; dissepiments thin ; fenestrules arcuato-quadrate ; pores usu- 
ally one at the middle, undulating the margin, and one at each dissepiment ; smaller 
pores in the interstices. 
R. polyporata. Ph. PI. I. fig. 19, 20. Florence Court. 
Interstices thick ; fenestrules large, irregular ; pores numerous, small, round. This 
somewhat resembles retepora cyathiformis, Goldfuss ix. 11 
R. laxa. Ph. PI. I. fig. 26 , 30. Whitewell ; in Kildare. 
An irregularly open net work ; interstices round, bearing on the reverse (28, 29) 
oval spaces in quincunx, and interjacent lines of very minute pores. In a specimen 
from Whitewell I raised a portion and found two rows of tubular pores on the obverse 
(fig. 30). It resembles gorg. ripisteria, Goldfuss vii. 2. 26 is from Kildare, in the 
collection of Rev. S. Smith, Trin. Coll. Dublin. 27 from Whitewell. I suppose them 
identical but not having found the obverse in Mr. Smith s specimen can not affirm it. 
R. pluma. Ph. PI. 1. fig. 13, 14, 15, Whitewell in Holland 5 
Greenhow hill ; Florence Court. 
Penniform ; branches and branchlets round ; two rows of large alternate pores ; 
reverse striated. 
Mili.epora.— -T his genus occurs very sparingly, in lower limestone ; 
Yoredale limestones, cherts, and shales ; also in millstone grit cherts. 
M. rhombifera. Ph. PI. I- fig. 34, 35. Bolland. 
Branches cylindrical, with acute rhomboidal cells in quincunx. 
M. interporosa. Ph. PL I. fig. 36, 39- Whitewell; Pateley bridge; 
Harrogate ; Florence Court. 
Branches round, somewhat uneven, cells oval with interjacent pores. On some 
specimens (39) the interjacent pores are very regularly placed, on others (38) more 
scattered. 
