Dr. H. Woodivard — Culm Trilohites from North Devon. 483 



border ; the neck-furrow is not clearly seen in Fig. 3, but a portion 

 is visible in Fig. 4, 1 mm. in width. 



Fig. 3 shows an entire head-shield from the Coombe Wood Quarry- 

 collected by Mr. A. K. Coomaraswamy, F.G.S., and has a counter- 

 part. Fig. 4 is from Mr. J. Hamling's collection (No. 704) from 

 Overton Quarry. There is also a free cheek and spine (No. 712) 

 from the same collection, Coddon Hill. On re-examining the earlier 

 material in the British Museum (Natural History) I find another 

 very good head-shield and counterpart (registered I. 3215) of this 

 species, presented by Mr. Joseph Hamling, F.G.S., in 1896, from 

 the Culm of Coddon Hill, Barnstaple. 



Pkoetus, Steininger, 1830.^ 

 Proetus Coddonensis, sp. nov. (PI. XX, Figs. 5-11.) 



I have spent much time in the examination of these small 

 Trilobites from Coddon Hill, Barnstaple, of which, thanks to 

 Mr. J. G. Hamling and Mr. and Mrs. Coomaraswamy, I have 

 received a large number of specimens. I selected Figs. 5, 8, and 11 

 as the most perfect examples, the heads Figs. 7, 9, and 10, and the 

 pygidium. Fig. 6, all of which I had reasonable expectations were 

 distinct. I regret to have to admit that my first impressions are 

 not borne out by a more lengthened study of the materials ; on the 

 contrary, I am now led to conclude that they must (notwithstanding 

 various minor differences) all be placed in the same species. 



These fragmentary remains number about 75 specimens, and 

 consist, for the greater part, of detached heads and tail- shields, only 

 about 21 examples having at least some of the thoracic segments 

 also preserved, 8 only being complete. These Coddon Hill 

 specimens are all extremely small. Fig. 5 being 6 mm. ; Fig. 8, 

 9 mm.; and Fig. 11, lOJ mm. in length. 



The head-shield is semicircular ; eyes never well preserved, but 

 where visible reniform ; glabella slightly broader behind, rounded 

 in front, marked by two triangular lobes at the base ; fixed cheeks 

 narrow at sides; glabella separated from margin of shield in front 

 by the smooth or striated border of the fixed cheek. The facial 

 suture which divides the fixed cheek from the free cheek crosses 

 the frontal border just in a line with the eye, above which it expands, 

 forming a rounded palpebral lobe ; then passing down close to the 

 line of the axial furrow, it diverges outwards and crosses the posterior 

 border obliquely behind the line of the orbit. Free cheeks roundly 

 triangular, centre of the cheeks raised ; margin smooth and broad, 

 produced into a short spine at the posterior angles ; neck-lobe 

 corresponding with the free thoracic segments in its axial portion. 

 Free thoracic segments number 7 in Fig. 5, 8 in Fig. 8, and 8 or 9 

 in Fig. 9. This discrepancy, which I at first regarded as of specific 

 value, if no more, I now conclude to be due to squeezing together 

 of the segments in Figs. 5 and 8, so as to conceal their full number. 



^ For a full description of the genus Proetus see H. "Woodivard, " Carboni- 

 ferous TrUobites" : Mon. Pal. Soc, 1884, pp. 55-57. 



