Prof. T. Rupert Jones — On the Palceozoic Phyllopoda. 459 



parently thin and tough, so as to allow of their being crumpled very- 

 much. This condition and the presence of harder parts of their 

 internal organs beneath give rise to various tubercular irregularities 

 of the surface, in some cases simulating ocular tubercles. There are, 

 however, no real eye-spots. There may have been irregularities of 

 the surface, due to the attachment of the muscles of the jaws within 

 the body. 



15. An ovate carapace, represented by a mere film, and five 

 abdominal segments, with a neat trifid tail, all flattened but very 

 distinct, have no close ally among the known forms. The segments 

 are delicately striate, with oblique lines on each side, suggesting 

 the name compta, which we propose for this specimen — Ludlow 

 Museum E. 



16. To C. inornata, M'Coy (Third Report, pp. 20, 21), we have 

 nothing to add, except that some large specimens (so named, 

 Cambridge Mus. 6/35) have a greater proportional depth (height) 

 at the ventral border than smaller individuals, and yet have the same 

 general outline and posterior slope, as well as the longitudinal lineate 

 ornament. (The presence of this sculpturing is not in accordance 

 with the trivial name.) These large specimens may belong to 

 C. stygia. 



In the Cambridge Museum is a specimen (6/36) of two abdominal 

 segments, with a style and a stylet in good preservation, being 

 convex and not injured by pressure. The penultimate segment 

 is smooth, but shows faint traces of oblique lines ; the ultimate is 

 quite smooth and cylindrical ; the telson (style) is attached by an 

 apparently rounded joint ; and the two uropods much resemble some 

 of those referred to C. robusta. This specimen is from Benson Knot, 

 and is labelled C. inornata ; but the evidence of its specific relation- 

 ship is supported only by its having been found in the same rock, 

 and by its size suiting the large form of C. inornata? (b/35). It 

 belongs possibly to C. stygia. 



17. From the list for C. inornata, given in the Third Eeport, we 

 have to remove one of the specimens found at Benson Knot, and 

 marked ' 44342 ' in the British Museum, being decidedly different 

 in outline (more ovate), though similarly marked with longitudinal 

 strise. It might well be named C. Rutliveniana, in memory of the 

 old geological collector who laboured for very many years in the 

 Kendal district for Professor Sedgwick and others. 



18. G. oretonensis and truncata, H.W. (Third Eeport, pp. 21, 22), 

 though near to C. inornata in shape, hold their distinct places as 

 species. 



19. Of C. solenoides and C. gobiiformis (Third Eeport, p. 22) 

 there is nothing new to be stated. 



20. As intimated in the Third Eeport, pp. 27, 28, the presence 

 of the ocular tubercle has an important signification, showing that 

 the animal must have had an organ equivalent to the eye sufficiently 

 developed to affect the external covering, whether it was adapted 

 for clear vision or not. It may be a family distinction ; at all events, 

 the oculate carapaces have to be removed from Ceratiocaris and we 



