462 Prof. T. Riqoert Jones and Dr. K. Woodward — 



faint traces of longitudinal striae on the hollow impressions of the 

 valves in the matrix, and there is a slight trace of the ventral rim. 

 The lai'ge one is 43 mm. long (fig. 5) ; the smaller specimen (fig. 5a) 

 27 mm., is apparently broken behind, but does not show the double 

 valve there as given in the figure; we cannot distinguish any 

 "nuchal furrow," nor is there any "eye-spot": a mark consisting of 

 two minute adventitious pits in the anterior third of one of the speci- 

 mens, and a little hole in another, have been mistaken for it. Mr. 

 Salter thought these little fossils were Molluscan ; ^ but they certainly 

 may well claim to be Phyllopods. There are other specimens in 

 the Cambridge Mus. ; also two small individuals, one 19 mm. and 

 the other only 10 mm. (marked //142) in length. In the Brit. Mus. 

 there are four, rather large, but not well - preserved specimens 

 (44342). All the above come from the Upper-Ludlow grey mi- 

 caceous sandstone of Benson Knot, near Kendal, Westmoreland. 



9. Ceratiocaris uobiiformis, sp. nov. 



A form closely approaching G. solenoides in shape, but smaller, 

 more acute in front, usually more vertically truncate behind, and 

 much more convex on the ventral border, accompanies C. solenoides 

 in the Upper-Ludlow sandstone of Benson Knot. One of the speci- 

 mens marked &/8, Camb. Mus., is 27 mm. long by 9 mm. high ; one 

 in the Brit. Mus., No. 44342, is 30 by 10 mm. ; M. P. G. x^V (Catal. 

 1878, p. 142) is 31 by 11 mm. The valves seem to have been 

 smooth. They distantly resemble in outline a deep-bodied, blunt- 

 headed little fish, without its tail. It is possible that this may be a 

 varietal or sexual form of C. solenoides, but it seems to be sufficiently 

 well separated from its ally to require a distinctive name, so we 

 refer to it as C. gobiiformis in our list. 



10. Ceratiocaris Salteriana, sp. nov. 



Six specimens in different states of preservation, from the Lower- 

 Ludlow strata, indicate the existence of a distinct species of Ceratio- 

 caris, having a nearly oblong carapace, ornamented with delicate but 

 strong horizontal parallel lines, rather wide apart. 



Specimen Ludlow Mus. K., from Trippleton, near Leintwardine, 

 has a carapace (23 X 12 mm.), five (?) abdominal segments (10 mm.), 

 and appendages, of which the style (pitted with bases of little spines) 

 is imperfect, but a stylet measures 5 mm. 



Another carapace M. P. G. ff « , from Bow Bridge, Ludlow, well 

 preserved, is 30 x 15 mm,, straight on the back, rounded at the 

 ends, the front being highest, and the greatest depth of the carapace 

 being at the anterior third of the ventral margin. A hinder moiety 

 of another carapace accompanies the last mentioned. 



In the Cambridge Univ. Mus. a/694 is a similar carapace nearly 

 as well preserved (30 X 14 mm.). The ventral margin has a distinct 

 raised rim. The striae and interspaces differ in tint of colour on the 

 cast. Some internal organs (teeth ?) have caused a little break or 



1 See Ann. Mag. Nat. Hist. I.e. p. 159, note; and Sedgwick's Lists of Kendal 

 Fossils ; Wordsworth's Letters on the Lakes, 1843-46, Appendix, 



