Miss E. M. Partridge — On Echinocaris Whidhornei, etc. 307 



VI. — Echinocaris Whidbornei (Jones & Woodward) and 



Echinocaris Sloliensis, n.sp. 



By Miss E. M. Partridge. 

 (PLATE XVII, EiGs. 7-9.) 



DURING the last year the Mar wood Beds of Sloley Quarry, near 

 Barnstaple, have yielded some additional specimens of Echino- 

 caris, which have afforded material for the present note. The 

 specimens have all been found in the fine micaceous shaly beds, 

 six to eight feet thick, on the north side of the quarry, below the 

 massive sandstones, and above the shallow- water bed containing 

 plant-remains, rain-prints, worm-tracks, etc. The same shaly beds 

 contain Lingula squamiformis in abundance ; other bivalves are less 

 frequent. They have now yielded as many as twelve specimens of 

 Echinocaris. 



Echinocaris Whidbornei (Jones & Woodward). 



One of the recently discovered specimens (Fig. 7) is more complete 

 than any hitherto found. The carapace is much crushed. The 

 six abdominal segments are well preserved ; the abdomen tapers 

 posteriorly. The segments increase in length towards the posterior 

 segment, the anterior somites being twice as long as wide, the 

 posterior somewhat less wide than long. The posterior margins of 

 the segments are furnished with nodes or short spines, those of the 

 two anterior segments being small and few in number. The four 

 posterior segments have also one or two short nodes or spines on the 

 dorsal or lateral surface. Telson smooth, slightly smaller than 

 the last abdominal segment, triangular in outline, produced into 

 a long slender spine quite twice as long as the posterior abdominal 

 segment. Ventral surface of this spine with a central furrow, 

 shown on the mould as a ridge, where a portion of the spine has 

 been broken away. Attached below the telson are two other 

 spines, which are slightly longer than the spiniform extension of 

 the telson. These spines also have a central furrow along the 

 ventral surface. 



Measurements : Abdomen, 18 mm, long ; segments, commencing 

 with the anterior, respectively about 2, 2*2, 2*7, 3 (?), 3, 4 mm. in 

 length; telson, 2mm. long by 2-5 wide; telson and spine, when 

 complete, together 10 mm. 



Echinocaris Sloliensis, n.sp. 



The description is based on two specimens (Figs. 8, 9), for one 

 of which I am indebted to Mr. F. J. Partridge, who discovered it. 

 The other was found by Mr. A. K. Coomaraswamy. Neither 

 specimen is complete, nor are they very well preserved. Carapace 

 convex, elongate-ovate in outline, the valves about twice as long 

 as broad, or more. Margins thickened, carinated, but wider and 

 flattened at the posterior ends of the valves, which ends are 

 rather widely separated. Cephalic region not well preserved in 



