SALTER EUEYPTEEUS. 233 



taken together, they are as long as the head, and form an oblong 

 oval, the deep notch in the pennltimate joint being filled exactly by 

 the oval terminal palette. The lobes on either side of this notch 

 are very unequal, the posterior being much the larger and longer. 



Locality. — Downton Sandstone (Uppermost Ludlow Eock) of King- 

 ton, IMr. E. Banks's Collection, fig. 7. Tipper Ludlow Shales, Lud- 

 ford Lane, Ludlow, figs. 7 & 8. Beds of passage at the base of the Old 

 Eed Sandstone, in the Eailway- cutting, Ludlow (Messrs. Lightbody 

 and Marston's cabinets), figs, t ^ Q. 



E. MEGALOPS, spec. uov. Plate X. figs. 9-14. 



Seven or eight inches long ; the body-joints attenuated, and the 

 tail acuminated ; head semicii'cular, rough ; eyes enormous, remote. 



The head, in the largest specimens known, is 1| inch wide (and 

 this would give fully the length here assigned to the body) ; it is 

 wider than long, semicircular, granuloso-plicate, and with the hinder 

 margin tuberculate. 



The great reniform eyes are nearly one-third as long as the head, 

 and (including the swollen base on which they are set, and the large 

 circular eye-lobe which covers them) fully one-third, measured from 

 within the eye-lobes ; they are about their own diameter apart, and 

 placed much more than halfway, but not quite two-thirds, up the 

 head. The anterior margin of the head (carapace) is rounded, or 

 very slightly angular, and margined all round the front. 



This being a large and plentiful species in the Ludlow passage- 

 beds, we are justified in associating with it the large and equally 

 abundant body-rings which occur there, — ^the smaller ones being 

 referable to the E.pygmceus. One specimen (fig. 13) shows the last 

 six joints, and traces of others, with the terminal joint, m. 



The seventh and eighth segments, g, h, are transversely broad, the 

 eighth being nearly twice as wide as long ; the ninth is three-quarters 

 as long as wide ; the penultimate is a little longer than wide, but 

 nearly square. AU have their posterior angles quadrate, except the 

 seventh, in which they are a little produced. 



The tail-joint, m, is narrowly ovate at the base, its broadest part 

 being distant from the base of insertion by more than half the 

 breadth, and thence gradually attenuated. The length is three- 

 and-a-half-times the breadth. A strong median keel runs all down, 

 and the edge is crenato-serrate ; that of the body-segments appears 

 to be quite smooth. 



Locality. — Base of Old Eed Sandstone, Ludlow EaUway. 



E. AcuMmATUs, spec. nov. Plate X. fig. 17, and probably fig. 19. 



We have the tail-joints only. They are much broader at the 

 base than in the last- described species ; but possibly they belong to 

 the opposite sex, as the individuals are nearly of the same size, and 

 occur in the same strata, namely the passage-shales between the 

 Upper Ludlow Eock and the Old Eed Sandstone, in the Ludlow rail- 

 way-cutting. 



