to Micro-Paleontology. 127 
existed, however, at the angles of the tubes (where alone in 
this form they could exist), they would certainly be detected 
in thin sections; and I have not seen any traces of such 
openings in either tangential or longitudinal slices. In the 
absence of mural pores the species must be referred to the 
genus Monotrypa, Nich., and it is, indeed, in many respects 
closely allied to the Monotrypa undulata, Nich., of the Tren- 
ton Limestone and Hudson-River formation of Canada. The 
‘principal characters, in fact, which would distinguish JZ. 
crenulata from the globular forms of MZ. undulata, Nich., are 
that the corallites of the former are, on the whole, decidedly 
larger than they are in the latter, that there are none of the 
smaller angular corallites which are found among the larger 
tubes in the latter species, that the thickened nodes at the 
angles of the larger corallites (“spiniform tubuli” ?) in JZ. 
undulata are wholly absent in M. crenulata, and that the 
walls of the corallites in the English species are decidedly 
more strongly crenulated than in the Canadian type. 
Formation and Locality. Wenlock Limestone, Dudley. 
Lower Ludlow Shale, Sedgeley (coll. Mr. Madeley). 
7. Monotrypa pulchella, EK. & H. 
I have already described and figured this species (‘ The 
Genus Monticulipora,’ p. 188, figs. 38, 39), and have nothing 
special to add, except that I find the species to be a more 
abundant one than I had previously supposed, fragments 
being not uncommon both at Benthall Edge and Dormington. 
EXPLANATION OF PLATE VIL. 
Fig. 1. Tangential section of Fstulipora crassa, Lonsd., sp., enlarged 
twenty times. 
Fig. 1 a. Longitudinal seetion of the same, similarly enlarged. 
Fy. 2. Tangential section of another example of F. crassa, in which the 
corallites are of smaller size. Two of the corallites are united 
by a lateral connecting-tube. Enlarged twenty times, 
Fig. 2a. Longitudinal section of the preceding, similarly enlarged. 
fig. 3. Tangential section of Fistulipora ludensis, Nich., enlarged twenty 
times. 
Fig. 3a. Part of the same, enlarged fifty times, showing “ spiniform 
tubuli.” 
Fig. 3b. Longitudinal section of the preceding, enlarged twenty times. 
Fig. 4, Outline of a specimen of Callopora nana, Nich., of the natural 
size, 
Fig. 4a, Tangential section of the same, enlarged twenty times. 
Fig. 4b, Longitudinal section of the same, similarly enlarged. 
Fig. 5, Outline of a fragment of Callopora Fletcheri, HW. & H., of the 
natural size. 
Figs. 5a & 5b, Tangential and longitudinal sections of the same, en- 
larged twenty times. 
Fig. 6. Outline of a specimen of Callopora? glans, Nich., of the natural 
size, 
