CONULARIA CORONATA. 23 



Conularia tenuis, var. maculosa, nov. Plate II, fig. 1. 



Five specimens of the seventy-two which I have examined differ from the 

 majority in having the ridges slightly wider, and their summits ornamented with 

 a row of small round tubercles (PI. II, fig. I). The latter are exceedingly well 

 marked over the whole of the shell in the specimens in which they occur, and as 

 in the common type there is not the least trace of tuberculatum, these few examples 

 constitute a well-marked variety. In all other characters they agree with the 

 normal type, except, perhaps, that the ridges form a curve across the face rather 

 than a sharp angle along the central ridge; but this difference is not strongly 

 marked. 



Conularia coronata, sp. nov. Tlate III, fig. 1 . 



Diagnosis. — Shell large, very thin, non-calcareous ; tapering uniformly ; cross- 

 section a flattened rhomb (?) ; faces equal, flat; apical angle about 15°. Marginal 

 grooves well defined; edges becoming prominent towards the aperture. Similar 

 grooves with raised edges marking the centres of the faces; half-faces again sub- 

 divided by fine secondary grooves. Aperture unknown ; apex pointed ; apical septa 

 not seen. Ornamentation inconspicuous — only seen with a lens. Ridges very fine, 

 regular (75 in 5 mm.), forming a series of festoons across the face, rising irregularly 

 at the marginal and central grooves, and falling in shallow arcs between ; growth- 

 lines following the course of the ridges. Ridges broken up by vertical striations ; 

 furrows smooth. 



Dimensions. — Length of largest specimen (incomplete), 107 mm. Greatest 

 width of face, 32 mm. 



Description, — Only two examples of this species are known, and each shows a 

 greatly crumpled and wrinkled surface, pointing to a very thin, probably non- 

 calcareous test. Plate III, fig. 1, shows the more nearly perfect of the two, but this 

 also has only three faces preserved, is greatly compressed, and slightly deformed, 

 so that the cross-section is doubtful. The prominent raised edges of the marginal 

 and central grooves, so well seen in this species, are of frequent occurrence among 

 the earlier Conularia?, but are never seen in the later forms. The fine and beautifully 

 regular ornamentation is best seen on the raised edges of the grooves (Plate 111, 

 fig. 1 b), where the test is less wrinkled, but can be traced across the crumpled 

 surface of each face. The course of the ridges is somewhat irregular ; they rise 

 at each marginal and central groove, but the height to which they rise and the 

 sharpness of the curves formed vary considerably on the different faces. The 

 ridges appear to be broken up by a very fine cross-striation, of which there is no 

 trace in the furrows. 



Affinities. — This species resembles the early smooth types superficially, but is 



