32 DEVONIAN FAUNA. 



and some other points. It very possibly may be the young of this species, to which 

 it bears a strong resemblance in outline. 



The structure of the test shown by the Lummaton specimens is very 

 interesting. As seen on the flat and partially decorticated portion of the head, it 

 presents the appearance of consisting of a number of hollow pores, or rounded 

 tubercles, according to its state of preservation, closely arranged, and with a 

 tendency to run into irregular grooves, and in some places becoming considerably 

 larger. However, a natural section of the test just under the border of the cheek- 

 spines shows that these represent two rows of short csecal tubes, situated exactly 

 opposite to each other, and leaving the interspaces to be filled up with other 

 material. Whatever further purpose this served, it must have considerably 

 lightened the shield for swimming. The same result was probably produced by 

 the very similar structure in the genus Trinucleus. 



In all our specimens the eyes are much injured, but they appear from 

 Goldfuss's plate to have been as peculiar in their construction as were the other 

 parts of this curious animal. They were slightly raised, and carried two or three 

 elongate lenses, just visible to the naked eye, as well as more numerous micro- 

 scopical facets. 



I do not at present know of any other species of Harpes from the English 

 Devonians. The Torquay Natural History Museum is restricted to objects collected 

 in Devonshire, and in it is a specimen of Harpes without locality, but which 

 was presumed to have come from Ramsleigh Quarry near Newton Abbot. It is a 

 variety of H. venulosus, Barr., approaching H. Bischofii, F. A. Rom. The character 

 of the matrix, however, makes me doubt its British origin, and believe that it is 

 really a Bohemian specimen placed by Dr. Battersby with his fossils for com- 

 parison, and that it has thus crept into the Museum by mistake. 



VII. Family. — Bronteime, Barrande. 

 1. Genus. — Bronteos, Goldfuss, 1839. 



The genus " Brontes " was founded by Goldfuss in 1839 ; but, as that name was 

 already in use for a genus of beetles De Koninck in 1841 suggested the name 

 " Goldius " (contracted from Goldfussius) in its place. Goldfuss, in 1843, instead of 

 adopting this alteration, modified his original name to " Bronteus," and this has 

 been generally accepted by later authors. 



It is a matter of unusual difficulty to determine the English species of this 

 genus. With the exception of Mr. Vicary's specimen of B. flabellifer, none of the 

 heads and tails have occurred in contact. Besides this, the specimens are 



