108 F. R. Cowper Reed — Salter'' s Undescribed Species. 



a long narrow axis tapering very gradually to its posterior extremity. 

 There are sixteen complete axial rings of gradually decreasing size, 

 extending for about two-thirds the length of the axis, and followed 

 by about twelve much narrower rings of equal size, interrupted in 

 the middle by a narrow smooth area, and extending to the point of 

 the axis, which is thus segmented along its whole length. 



Only one of the lateral lobes is preserved, but this shows the 

 eleven pleurae of which it is composed, and is bent down rather 

 strongly towards the posterior end. The anterior pleurEe curve 

 weakly backwards, but the posterior ones more strongly, and the 

 last one, which starts at the level of the sixteenth axial ring, runs 

 back alongside of the axis to the posterior margin. Each pleura 

 appears to be provided with a shallow median longitudinal furrow. 



There are obscure traces of small tubercles on the surface, but 

 the ornamentation is very indistinct. 



Measurements. 



mm. 



Length of pygidium 12-0 



Width of ditto (estimated at) 10-0 



Affinities. — The most closely allied species might appear at first 

 sight to be J^. multisegmentatus, Portlock,^ but the resemblances lie 

 more in the large number of the segments than in the characters of the 

 parts of the pygidium. For the segmentation of the axis is different, 

 and the course of the pleurae is not the same. The segmentation 

 of the postei'ior part of the axis more resembles that of J^. punctatus, 

 though the anterior part with its complete rings is quite different, 

 and is similar to that in Portlock's species. As far as the axis is 

 concerned, it thus seems to share the characters of these two species. 



Turrilepas ?? ketleyanus, Salter. 



1873. Turrilepas hetleyanus, Salter: MS. Cat. Camb. Sil. Foss. Woodw. Mus., 



p. 129 {h 730). 

 1891. Turrilepas ketleyanus, "Woods : Cat. Type Foss. Woodw. Mus., p. 132. 



The two original specimens are very poorly preserved and fi'ag- 

 mentary and the plates seem to be displaced from their original 

 position, and the description, therefore, is far from satisfactory. 

 The specimens are from the Wenlock Limestone of Dudley, and 

 were presented to the Woodwardian Museum by Mr. C. Ketley. 



Diagnosis. — Two vertical rows of loosely arranged, alternating 

 plates of regular (?) shape, followed above by a closely imbricated 

 mass of irregular plates. There are four or fi^ve plates in each of 

 the vertical rows, but their shape is somewhat doubtful, as their 

 edges appear to be broken in most cases, but they seem to be 

 transversely oblong (not triangular), with their upper and lower 

 edges sub-parallel, and the outer edge rounded ; they are also 

 slightly arched from side to side, and their surface is marked by fine 

 strise parallel to the outer edge and by minute pits and granulations. 



' Portlock : Geol. Eep. Loud., 1843, p. 291, pi. iii, fig. 6. Tornquist : Undersokn. 

 Siljans. Trilobitf., 1884, p. 24, pi. i, figs. 18, 19. 



