CERATIOCARIS HALLIANA. 29 



are shown. The one next the valve is broken by a crack in the stone. Some 

 others (five ?) have left a faint trace within the carapace. 



Mus. Pract. Geol., marked " x ^. Lower Ludlow ; Leintwardine. Geratiocaris 

 leptodadylus, M'Coy." See ' Catal.,' 1878, p. 142. In olive-grey micaceous 

 mudstone. 



PI. II, fig. 4. Carapace, five or six segments, and the caudal appendages. 

 The carapace is small (25x12 mm.), and shows its left valve. The valve is 

 smooth, but crumpled lengthwise, and wrinkled in the ventral region. The maxillas 

 are indicated by pressure in the anterior third. The abdominal segments are 

 crushed, and, being defective in their upper and lower margins, therefore look 

 narrower than they were originally. There are traces of longitudinal striation on 

 all the segments. The style is 25 mm. long, minutely ridged, and rugose ; this 

 roughness being due probably to decomposition, but partly perhaps to having been 

 originally tuberculate or spined. There are two stylets, much shorter than the 

 telson, unequally preserved, and close together ; one is about 12 mm. long. 



Mus. Pract. Geol., marked " x ^. Lower Ludlow ; Bow Bridge, Ludlow. 

 Geratiocaris leptodadylus, M'Coy. Presented by A. Marston." See ' Catal.,' 

 • 1878, p. 142. In olive-grey micaceous sandstone, with small Brachiopods and 

 Orthoceras. 



PI. IV, fig. 5. Small carapace and two segments. The former apparently 

 smooth, but bearing obscure longitudinal stri« in the postero-dorsal region. 

 Thickened with obscure internal contents. Segments passing up apparently to 

 the anterior third (upper side). Young (?). Oxford Mus. K. Lower Ludlow. 

 In brownish-grey mudstone. 



PI. IV, fig. 6. Very small carapace and six segments. Probably two valves, 

 wrinkled by pressure ; no strise visible. Obscure organic contents. Six exposed 

 segments shown as flat casts, — portions of the test on the last two longi- 

 tudinally striate. Young (?). Oxford Mus. J. Lower Ludlow. Olive-grey mud- 

 stone. 



PI. V, figs. 6 a, 6 b. Carapace, eight segments, and caudal appendages. Cara- 

 pace, with its right valve outwards, smooth, crushed, and somewhat crumpled 

 along the ventral region. Anterior extremity frayed out. Indications of internal 

 organs in the fi'ont part. Bight body-segments crushed and broken ; one of them 

 (sixth fi-om the end) has the epimeral border preserved with its neat sculpturing, 

 partly longitudinal, and partly interlacing or lattice-like (fig. 6 b). Articulations 

 (for uropods?) are present on the lower portions of some segments. Telson 

 and stylets imperfectly preserved; the former pitted with prickle-bases. Some 

 small scattered dark spots occur on the stone beneath the anterior end of the 

 carapace, and these may have been fragments of some of the internal organs. 



In hard greenish-grey mudstone, with small Brachiopods ; calcareous. Lower 



