396 Prof. Rupert Jones and Dr. Woodward — On Ceratiocaris. 



from the Denbighshire series (Wenlock), at Dinasbran, Llangollen, 

 showing fine strise above, and coarse strite below, and the usual con- 

 vergence of strise, belongs probably to C. stijgia. 



Good specimens of C. stygia from Lesmahago are Cambridge Mus. 

 &/I06, 6/65 (the last is referred to as C. pa/)«7fo, evidently by mistake, 

 in Cat. C. Sil. Foss. p. 178) ; M. P. G. x-^-V and -^h, x-J^, xA, x-i,-, 

 X -Jr; and B. M. 41898, 45154, 45155, 45156. 



In the Mem. Geol. Scotl. Expl. Map 23, 1873, at p. 49, Mr. E. 

 Etheridge, jun., enumerates the places near Lesmahago and Muirkirk, 

 in Lanarkshire, where Ceratiocarides have been found by the Sur- 

 veyors, namely — 



Ceratiocaris papilio, Salter, at Dunside (Logan Water), Eaglinside Burn, Logan 



Water (2 m. S. of Lesmahago), and Linburn. 

 Ceratioca7-is stygia, Salter, at Kip Burn (Logan Water), Eaglinside Burn, and 



Linburn. 

 Ceratiocaris, caudal appendages, at Long Burn (Logan Water), Dunside (Logan 



Water), Logan Water (6 m. S.W. of Lesmahago), Lann Burn, and 



Douglas Water. 



Abdominal segments and appendages probably belonging to C. 

 stygia are : — 



B. M. 58878, Linburn, Muirkirk. A telson, not quite perfect at 

 base, 35 mm. long, associated with some obliquely-striate segments. 



B. M. 41899, Lesmahago. Four segments, 27 mm., and M. P. G. 

 X -2-s-c, four segments, 30 mm., and in each case two short ensiform 

 stylets attached (style wanting). 



B. M. 41900 and 41901, Lesmahago. Three abdominal seg- 

 ments, obliquely striate, and an ultimate segment with both oblique 

 and straight striae, probably due to two layers of the test. Telson, 

 30 mm. long ; and two ensiform stylets, each about 13 mm. long. 



M. P. G. X -i^s , -aVa, 2V&J -ahd, Logan Water, Lesmahago. Seg- 

 ments with oblique strige (one ultimate segment has straight strias), 

 not well preserved. 



Oxford Mus. E. Seven segments and two spines, imperfect. 

 Leintwardine. 



One of the specimens in the Brit. Mus. marked 59648, from Les- 

 mahago, is a small acute-ovate carapace (25x15 mm.), to which 

 is attached a complete, but somewhate crushed body of 13-14 seg- 

 ments, 6-7 (15 mm.) of which are external, and have appended two 

 caudal spines, of which the longest may be the telson (12 mm. long), 

 and the other, nearly as long, one of the stylets. 



At first sight this looks like the small C. Murchisoni, Ludl. Mus. 

 A., but it differs considerably in details. If it be not a distinct 

 species, it may be the young of C. stygia. 



On another of the specimens, B.M. 59648, from Lesmahago, are 

 three loose small bodies, without carapaces. The largest has 13 or 

 14 segments, 45 mm., some of which are obliquely striate. The 

 last five measure 25 mm., and the last one 10 mm., equal to three of 

 the others. The telson is 20 mm. long. Another such specimen, 

 smaller and narrower, 35 mm. long, has 14 (?) segments ; the last 

 one 7 mm. long ; appendages imperfect. 



