The, Invertebrate Fauna of the Uitcnhagc Series. 211 



point the outline tapers very gently, almost imperceptibly, in the 

 alveolar direction, more markedly (though still gradually) in the 

 apical direction. The length of the fragment is 45 mm. At the end 

 towards the alveolus the transverse diameter is 11 mm., the dorso- 

 ventral diameter 9 -5 mm. At the other end the transverse diameter 

 is 9 mm., the dorso-ventral measurement 8 mm. Situated on the 

 side are two parallel, shallow longitudinal grooves, placed closely to 

 one another. Towards the anterior end of the specimen the surface 

 is becoming split off in the form of thin laminae. 



This specimen is evidently the representative of some subfusiform 

 species. The shape of the rostrum, though this is represented by an 

 imperfect fragment, is sufficiently suggestive, and in addition there 

 is the presence of the shallow parallel grooves on the side and the 

 foliaceous character of the surface towards the alveolus. These two 

 latter points, apart from the shape of the guard, at once recall certain 

 Hastati of the European Neocomian, and there can be no doubt con- 

 cerning the broad relationships of the specimen. The greatest 

 thickness of the guard is, however, nearer to the alveolus than in 

 Belemnites jaculum Phill. ( = B. subfnsiforinis Rasp.), B '. pistilliformis 

 Blainv. ( = B. pistillirostris Pav.), or B. obtusirostris.* The outline 

 iu section is more oval and compressed than in B. jaculum, and 

 although in that species there is some variation with regard to the 

 form of the section, Mr. G. W. Lamplugh informs me that he has 

 never observed quite such a degree of compression as is shown by 

 the Brentford specimen. 



2. The specimen from Coega is still less favourably preserved for 

 a satisfactory comparison with known forms, but it also belongs to 

 some subfusiform species, and one which has a rostrum of relatively 

 slender figure. It is a fragment of a guard from which the alveolar 

 and apical ends are missing, and is compressed in manner similar to 

 that shown by the other specimen. It measures 46 mm. in length. 

 The transverse diameter at the thicker end is 8 mm., the dorso- 

 ventral diameter 7 mm. The specimen tapers gradually from here 

 towards the thin end, where the greatest diameter is 4 mm. This 

 end is most probably approaching the alveolus, though it shows no 

 sign of a ventral groove. Here also the surface shows no foliaceous 

 character, but the specimen is so unfavourably preserved and so 

 much weathered that these negative characters are not of much 

 significance. It is possible, however, that this thin end of the 

 specimen lies towards the apex, but if this be the case we are dealing 

 with a hastate form remarkable for the slow tapering towards the 

 * Pavlow and Lamplugh (1), pp. 77-82. 



