EMMELEZOE MACCOYIANA. 71 



(higher) than Em. Maccoyiana : though imperfect, it seems to have been nearly- 

 semicircular in outline below with an acute and projecting postero-dorsal angle ; 

 and its surface has a fine, almost silky, linear ornament. As a new species we 

 have called this E. tenuistriata. No locality is noted ; but it is probably from 

 the Lower Ludlow series near Ludlow, in the usual greenish-grey mudstone, 

 slightly calcareous, with a fragment of Graptolithus priodon. The carapace-valve 

 is elliptical in shape, slightly arched on the back, deeply aud nearly symmetrically 

 curved below ; the postero-dorsal angle is above the median line and strong. 

 The antero-dorsal region is embedded in the matrix. The valve, brown, thin, and 

 filmy or membrane-like, is much flattened by pressure ; it is ornamented with very 

 delicate longitudinal strias, magnified in fig. 9, h (placed vertically instead of hori- 

 zontally on the plate). A morsel of the browner and more solid test is visible at 

 the antero-ventral margin ; also at the broken edge of the specimen where the 

 compressed contents of the carapace are seen to constitute a definite layer over- 

 resting upon the opposite (embedded) valve. 



In the antero-dorsal region is a small, round, raised ocular spot. Lower down 

 and more behind is a rough cavity with an irregular raised rim, caused by the 

 presence of internal organs. 



4. Emmelezob Maccoyiana, T. B. J. ^- H. W., 1886. PI. VIII, figs. 2 a, 2 6. 



1878. Ceeatiocaeis Muechisoni, Kuxley, Newton, Sf Etheridge. Catal. Fosb. 



M. P. G.. p. 118. 



1885. — ELLiPTicA; T. B. J. ^ H. W. Third Eeport Pal. Phyll., p. 352 ; 



Geol. Mag., 1885, p. 466. 



1886. Emmelezoe Maocotiaua, — Fourth Eeport, p. 233 ; Geol. 



Mag., 1886, p. 460. 



Carapace-valve boat-shaped, narrow-elliptical, smooth, longitudinally striate, 

 with the lines rather wide apart. In general character hke PL VIII, fig. 3, but 

 smaller and much narrower in proportion. Much flattened by pressure. Not so 

 large as in fig. 1, and difiering from it in both anterior and posterior outlines. 



This specimen, M. P. Gr. ff , smaller than either E. elliptka or E. crassistriata, 

 is somewhat boat-shaped, and between the two above-mentioned in shape but not 

 identical with either ; and it is rather coarsely striated longitudinally. To this form 

 we have given the name E. Maccoyiana in honour of the first describer of any 

 member of the genus. 



The specimen is from Leintwardine (Lower Ludlow), in brownish-grey, mica- 

 ceous mudstone, calcareous along thin streaks at the edge. 



