232 REPORT— 1886. 



condition and the presence of harder parts of their internal organs beneaj;h 

 give rise to various tubercular irregularities of the surface, in some cases 

 simulating ocular tubercules. 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, B. 



To G. inornata, M'Coy (' Third Report,' pp. 20, 21), we have nothing 

 to add, except that some large specimens (so named, Cambridge Mus., 

 b/35) have a greater proportional depth (height) at the ventral border 

 than smaller individuals, and yet have the same general outline and pos- 

 terior 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 G. shjgia. 



In the Cambridge Museum is a specimen {hj'iQ) 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 G. robusta. This 

 specimen is from Benson Knot, and is labelled G. inornata ; but the evi- 

 dence of its specific relationship is supported only by its having been 

 found in the same rock, and by its size suiting the large form of G. inor- 

 nata ? (b 135). It belongs possibly to G. stygia. 



17. From the list for G. inornata., given in the ' Third Report,* 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 striae. It might 

 well be named C. Buthvenia^ia, 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 Report,' pp. 21, 22), 

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



19. Of 0. solenoides and C. gohiiformis (' Third Report,' p. 22) there 

 is nothing new to be stated. 



20. As intimated in the ' Third Report,' 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 de- 

 veloped 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 Geratiocaris, and we propose that 

 M'Coy's G. elliptica be referred to a new genus under the name 

 Fjmmelezoe} 



JE. elliptica, M'Coy, is described in the ' Third Report,' p. 27, as 

 represented by the type, Cambridge Mus. h/15 ; but Ludlow Mus. G., and 

 M.P.G. X -^ and §f differ from it considerably. The first of these is 

 shorter and broader (higher), nearly semicircular in outline, with an acute 

 and projecting postero-dorsal angle ; and its surface has a fine, almost 



' ''EfifieK'fis, elegant ; ^wfi, life (a termination common in some of M. Barrande's 

 genera). 



