Neio Myriapods from the Palceozoic Rocks of Scotland. 123 



broader behind than in front. The eye-spots are few in 

 number, and are arranged in groups situated near the posterior 

 rounded angles of the head. Only the bases of the antenna? 

 are preserved, and they seem to have been placed well 

 forward. Anterior margin of head not seen. No mouth- 

 organs observable, as only the dorso-lateral aspect of head is 

 exposed. 



Body. — The body consists of sixteen segments, all of which 

 appear to be simple, but they do not seem to be alternately 

 larger and smaller, as is the case in KccvijKcaris Forfar cnsis. 

 The first four segments are smaller than the rest. All the 

 segments appear to have been produced into lateral lamellae, 

 but these are not so pronounced as in Archidesmus. The 

 sculpturing of the test consists of a slight granulation and 

 occasional papillae, on which were probably set spines during 

 life. No legs seen. 



Locality. — Kerrera, near Oban. 



Formation. — Lower Old Eed Sandstone. 



Collector. — A. Macconochie. 



Genus Archidesmus (Peach). 



Archidesmus loganensis, n. sp. 



[Plate IV. Fig. 4.] 



This name is founded on a specimen of the anterior portion 

 of a Myriapod, about 15 mm. long by about 5 mm. wide, 

 showing the head followed by eleven or twelve body 

 segments, with parts of the antennae and several walking- 

 limbs attached. It is flattened, and only show^s the dorsal 

 aspect. As the portion of the body preserved shows a very 

 slight tapering, it is inferred that it belongs to what was a 

 much-elongated creature. 



Head. — The head is shaped like the ace of clubs, as shown 

 on playing-cards. Small eye-spots are scattered over the 

 side lobes, but the most marked feature of the head is the 

 great size of the pits out of which the antennae arise. The 

 antennae are very massive for the size of the head. Four 

 joints of the right antenna are preserved. These pass 



