ONTCHIOPSIS. 49 



(Y. 1069. PI. III. Pig. 4. Ecdesboume. 



Presented by P. Rufford, Usq., 1885. 



V. 2161. PL III. Pig. 2. "i T. , T. 



EcolesDourne. 



V. 2159. PI. III. Fig. 3, and Woodcut, Pig. 4, p. 50. ^ 

 IV. 2159«. Woodcut, Pig. 5, p. 50. J ^"^""^ ^"^^- 



In PL III . Pig. 2 (V. 2151) we have portions of pinnse showing 

 all the characteristics of Onychiopsis Mantelli. At a the lower 

 part of a pinna is preserved with the axis prolonged, and bearing 

 alternately disposed narrow ovate appendages ; these appendages 

 must be regarded as fertile segments of the pinna. There is a 

 gradual transition seen from the sterile to the fertile part in the 

 right-hand fragment shown in Pig. 2a. In the same Pigure, at I, 

 the terminal portion of a fertile pinna is more perfectly preserved, 

 and here the distal end of the axis has the characteristic serrate 

 form of the tip of an ordinary sterile frond. 



In PL III. Pig. 4 (V. 1069) three fertile axes are shown ; these, 

 if taken alone, would doubtless be referred to a position far 

 removed from Onyehiopais Mantelli, but if we compare them with 

 the terminal portions of the pinnse of Pig. 2 (V. 2151), there can 

 be no doubt as to their real nature. At the tip of the right-hand 

 axis the serrate character is readily seen, as previously noticed in 

 PL III. Fig. 2i, but this is rather too small to be distinct in the 

 figure. The specimen (V. 1069) shown in Pig. 4 affords strong 

 proof of the intimate relationship between 0. Mantelli and 

 0. elongata (GreyL), as figured by Geyler.^ 



The details of the fertile segments are best seen in PL III. Pig. 3 

 (V. 2159) ; three of the segments are enlarged 31 times in the 

 "Woodcut, Pig. 4 (p. 50). 



In the Woodcut, Pig. 5, four segments of another specimen are 

 also enlarged Z\ times; these are somewhat shorter and show a 

 much more distinct median line. Compare with these figures 

 Yokoyama's figure of 0. elongata;'' there is a close agreement, as 

 regards the fertile segments. Cf. also Velenovsky's figure of 

 Onychiopsis {Thyrsopteris of Velenovsky) capmlifera, VeL' 



' Palffiontographica, vol. xxiv. pi. xxxi. fig. 5. 

 * Tokoyama, loe. cit. pi. ii. fig. ib. 

 ^ Velenovsky, loe. cit. pi, i. fig. 10. 



