the Devonian of Cornwall. 153 



parallel with them, which accounts for its having escaped even 

 greater distortion. 



McCoy originally described it in 1851 in his "Synopsis of 

 Woodwardian Fossils," p. 177. Salter defines it as "General form 

 broad-oval. Head semicircular, very convex, covered with granules. 

 [Owing to the absence of the tests the ornaments of tubercles on 

 the glabella cannot be seen in Mr. Fox's specimen, but traces of 

 these can be detected in the intaglio.] The sides (cheeks) much 

 bent downwards. Glabella fully half the width of the head, very 

 tumid, slightly pointed in front, and overhanging the front margin. 

 Its greatest width exceeds its length, even including the neck- 

 segments ; a small basal lobe, with a tubercle on each side, but no 

 ^labellal furrows visible. Cheeks moderate [genal border rounded 

 posteriorly], with a strong border. Eyes large, prominent, with 

 few, about thirty-six, lenses, five in a row " (after McCoy). We 

 may add to this : — Thorax consisting of eleven well-defined free- 

 «egments ; axis strongly arched, semi-cylindrical, with a deep 

 furrow separating it from the pleurse ; pleurjB strongly recurved, 

 rounded, and somewhat expanded at their extremities. Pygidium 

 semicircular, small, convex, surface somewhat smooth, axis well 

 marked, but divisions of pleurae only faintly indicated. 



Measurements : length of head 7 mm., of eye 4 mm., of thorax 

 12 mm., of pygidium 5 mm. ; breadth of axis of body 3 mm. 

 Mr. Howard Fox's original specimen is from east of Cant Cove, 

 St. Minver. 



No. 4. This specimen (PI. V, Fig. 4) no doubt belongs also to 

 the same species as No. 3. It gives a side view of another example, 

 in which, however, the head is partially wanting, but the crushed 

 glabella and the left eye can be detected. 



Total length 24mm. Head 6 mm. long; length of (11) thoracic 

 segments 12 mm. ; pygidium 6 mm. Breadth of exposed axis and 

 left pleurge 8 mm. (broadened by pressure). The form of the 

 pleurae with their rounded, recurved, and expanded extremities is 

 well seen in Fig. 4. This specimen also comes from the Devonian 

 of Cant Hill, St. Minver. 



No. 5. This example is not figured. It is similar in condition 

 to No. 4, but is less well preserved. All the thoracic segments seem 

 present; the head, however, is wanting (or represented only by the 

 projecting eye) ; the pygidium is also absent. Length 15 mm. 

 Same locality as preceding specimen. 



3. Phacops (CRYPHiEus) PUNCTATUS, Steininger. (PL V, Fig. 5.) 



Olenus punctatus, Steininger, 1833: Mem. Soc. Geol. Fr., vol. i, p. 356, pi. xxii. 

 Phacops pmictatus, Salter, 1864 : Mon. Pal. Soc, p. 59, pi. i, figs. 17-19 (and 

 woodcut, p. 59). 



This specimen is marked No. 7 in Mr. Howard Fox's collection, 

 and like the others is from Cant Hill, St, Minver. It consists of 

 the profile of a head of a trilobite showing the free-cheek and 

 compound facetted eye. The margin of the free-cheek has a strong 

 ridge along it, and, although so imperfect a fragment, I am inclined 



