Neiv Myriapods from the Palceozoic Bocks of Scotland. 125 



first limb, shorter individually than those of the second, lead 

 to the inference that these two are in place, and attached to 

 the first and second segments of the body, while all those of 

 the left side are detached, and carried bodily forward from 

 their respective segments. The fact that the third or long 

 joint of the most anterior limb seen on the left side covers 

 the tip of the antenna also, strengthens this inference. 

 Further, the massiveness and breadth of the limbs, some of 

 which are as broad as the depth of the dorsal scutes of any 

 of the segments, seem to indicate that the segments were 

 single, and each only supported one pair of limbs. Although 

 there does not appear to be an alternation of larger and 

 smaller segments in the present form, yet its general con- 

 struction shows that it is very nearly allied to Archidesmus 

 Macnicoli, of the Lower Old Eed Sandstone of Forfarshire ; 

 and I propose to let it remain, provisionally, in the same 

 genus with it, till more material turns up from these older 

 rocks. 



Locality. — Logan Water, one mile west of Logan House, 

 Lesmahagow, Lanarkshire. 



Formation. — Ludlow. 



Collectors. — Messrs A. Macconochie and D. Tait. 



In the year 1859, a fragment of an Arthropod from the 

 Lower Ludlow rocks of Leintwardine, in the cabinet of 

 Mr Salwey, was figured by Messrs Huxley and Salter in 

 plate xiii. fig. 17 of monograph i. of the " Memoirs of the 

 Geological Survey of the United Kingdom." In the text of 

 that memoir, page 25, Huxley says : " The fossil figured in 

 plate xiii. fig. 17, is evidently crustaceau, but it exhibits 

 no character by which it can be identified as a part of 

 Pterygotns. ... I know of only two crustacean structures 

 with which this body can be compared, the one is the cara- 

 pace, the other is the swimming-limb of a Copepod, with its 

 coalesced, lamellar, basal joint greatly developed." Subse- 

 quently, Dr Henry Woodward described the remains as 

 those of an Amphipod Crustacean, under the name of 

 Necrogammarus Salwey i} Though I have not had the 



1 Trans. JVoolhopc Nat. Field Gluh, 1870. 



