436 MR. F. R. COWPER REED ON THE [Aug. 1 896, 



This species has been recorded from the Haverfordwest area by 

 Messrs. Marr and Roberts, 1 but this is the only mention of its 

 occurrence in Britain, so far as I am aware. 



Harpedid^:. 

 Harpes Wegelini, Ang. 



Fragments of the head- shield of this large species are not very 

 uncommon in the Keisley Limestone, but I have not seen a glabella. 

 In all points the limb and genal portion with the narrow border 

 surrounding the head shield agree with Angelinas figures, and with 

 specimens from the Leptcena-Limestone with which I have been 

 able to compare them. 



Harpes costattjs, Ang. ? 



A portion of a head-shield of a Harpes appears to belong to this 

 species of Angelin, 2 for it shows the convex perforated limb, the 

 narrow striated border, and the convex genal portion with the 

 prominent eye-tubercle ; but the glabella and other parts are not 

 preserved. Angelin's species occurs in the Leptcena-Limestone. 



Harpes, sp. a. (PL XXI. fig. 4.) 



The posterior end of a very small trilobite consisting of a minute 

 pygidium with several thoracic segments attached, has recently 

 been found, and must be held to belong to the genus Harpes. The 

 portion preserved is in all only 2 millim. long, and a little over 

 4 millim. broad. The thoracic portion consists of horizontally- 

 extended pleurae in close contact with each other, and of a raised 

 convex axis. The pleurae are narrow, flat, and rectilinear, with 

 parallel borders, and without any visible furrow. There is no 

 break between the thoracic and the pygidial portions of the speci- 

 men. The pygidium is transversely elliptical in shape, and has a 

 straight front edge and slightly rounded angles. Its axis is very 

 narrow, being only about one-fifth of the whole width of the 

 pygidium at its anterior end ; it tapers very gradually posteriorly, 

 but is short, and does not reach the posterior margin. There are 

 two or three very faint rings on it, and just traces of ribs on 

 the lateral lobes. 



Harpes, sp. /3. (PI. XXI. fig. 5.) 



Another pygidium of a Harpes of about the same size has been 

 found, with several body-rings attached. It resembles the one 

 above described in the character of the rectilinear pleurae, the flat 

 horizontal lateral lobes of the pygidium, and the absence of any 

 furrow on the ribs ; but it differs in the relatively broader axis and 

 its more rapid tapering, so that it terminates some distance from the 

 margin. The anterior end of the axis is nearly one-third the width 

 of the pygidium. At first sight it is almost impossible to say where 

 the thorax ends and the pygidium begins, for there is no marked 

 break in the series of eight or nine rings on the axal portion, nor 



1 Quart. Journ. Geol. Soc. vol. xli. (1885) p. 476. 



2 Angelin, ' P&Ueont. Scandin.' 1854, p. 85, pi. xli. fig. 4. 



