216 .OTOZAMITES. 



fronds with shorter pinnae ; the latter term was adopted by 

 Phillips as a specific name. The type-specimen of Phillips' species 

 is in the York Museum, and consists of an imperfectly preserved 

 portion of a frond which cannot be satisfactorily defined as 

 a species distinct from 0. acuminatus, but is, I believe, identical 

 with this species. The drawing given by Phillips is by no means 

 accurate ; the veins in the pinnae are numerous, and not as 

 represented in the figure. 



This species bears a close resemblance to Otozamites Beani, and 

 the two types of frond may be almost connected by transitional 

 forms; the longer and narrower acuminate pinnse of Otozamites 

 acuminatus afford the most convenient distinguishing feature. 

 Some fronds of Williamsonia gigas also present a strong likeness 

 to those of Otozamites acuminatus ; their resemblance affords one 

 of several instances illustrating the difficulty of drawing any 

 satisfactory distinction between the Zamites and Otozamites type 

 of pinnae. In Otozamites acuminatus the lower pinnse are shorter 

 and broader than in Williamsonia gigas, and are frequently 

 attached to the basal portion of the rachis at a slightly obtuse 

 angle. Good specimens of the species occur in the Museums 

 of Scarborough, Whitby, and Newcastle, also in the Museum of 

 Practical Geology, Jermyn Street, London, and in other collections. 



39,203. PI. VI. Fig. 1. 



Part of a specimen 15 cm. long ; labelled by Bean Otozamites 

 acuminatu*. The pinnae are attached to the rachis at a wide 

 angle, and are shorter, broader, and more acuminately pointed than 

 in Williamsonia gigas. The bases of the pinnae, as shown in the 

 figure, are rounded at the corners and are hardly typical of 

 Otozamites, but some of the smaller pinnae of this species are 

 more definitely lobed and conform more nearly with the recognized 

 character of the genus. Cf. Zamites Moreaui, Sap. 1 



Scarborough. Sean Coll. 



40,468. PI. II. Fig. 1. 



The total length of the specimen is 9-5 cm. This specimen 

 probably represents the basal portion of a frond, as we know from 



1 Saporta (75), pis. xiv. and xv. 



