Correspondence—MM. Boulenger and Lydekker. 191 
Kjerulfi in Norway in 1870. He published an account of this dis- 
covery in 1871, naming the characteristic Trilobite Paradouides 
Kjerulfi,| and figuring it. The identity of this species with the pre- 
viously named Paradoxides Wahlenbergi of Dr. Torell was distinctly 
acknowledged by Linnarsson in the year 1876.2, Thus, while it 
must be admitted that Linnarsson’s specific title of Paradoxides 
(Olenellus) Kjerulfi must be retained as that of the first Trilobite 
figured and described from the Olenellus Zone in Europe; yet the 
actual credit of the original detection of this Olenellus zone belongs 
unquestionably to Dr. Nathorst, who made known its stratigraphical 
position in Sweden at least two years before Linnarsson detected and 
described the species of the Olenellus zone from Norway. 
Cuas. Lapworts. 
A WOODEN DINOSAUR.$ 
Srr,—Frequent protests have been entered against the hastiness 
with which new species or even genera are founded upon frag- 
mentary materials. But all previous blunders in this line are 
thrown into the shade by the recent restoration of a new genus of 
Dinosaurs, Aachenosaurus, from two fragments which, on micro- 
scopical examination, prove to be nothing but masses of silicified 
wood. The contributions to this subject, quoted below, not being 
easily procurable, we think the readers of this Journal may be 
interested by the following analysis. 
In two notes published in Belgium, Abbé G. Smets describes 
a fossil obtained by him from the sands of Aix-la-Chapelle, in 
a quarry at Moresnet, Belgium, between Verviers and Aix-la- 
Chapelle, sands in which, according to the most competent local 
authorities, no vertebrate remains have as yet come to light. This 
fossil has been described as a portion of the right dentary bone, 
“to which joins another fragment, very probably of the coronoid,” 
of a new Dinosaur of the family Hadrosauridee. The author declared 
he had tested the bony nature of this fossil by means of the lens and 
the microscope, without, however, making any sections; while some 
incrustations were identified by him as teeth. A plate, so rudely 
executed as to be utterly worthless, accompanies his second paper, 
which concludes with an attempt at a restoration of this marvellous 
Dinosaur, which is supposed to have been biped, to have attained 
a length of 4 to 5 metres, to have been provided with a spatulate 
mandible, to have fed on succulent plants, while its hide was 
probably furnished with an armour of dermal spines. 
M. Dollo having obtained leave to examine and make micro- 
1 Linnarsson, Ofvers. af Kongl. Vetens. Akad. Férhand. 1871, p. 784. 
* Ibid, Brachiopoda of Swedish Paradoxides beds. Bihang. Kong. Swensk. Vet. 
Akad. Handlingar. 1876, p. 5. j 
3G. Smers. Un Reptile nouveau des Sables d’Aix-la-Chapelle. Muséon 
(Louvain), vi. 1887, pp. 183, et seg. 
G. Smets. Aachenosaurus multidens, Reptile fossile des Sables d’ Aix-la- 
Chapelle (Mémoire présenté au congrés des savants catholiques & Paris et 
lu dans la séance du 9 avril, 1888). Hasselt, 1888, 8vo. 23 pp., 1 pl. 
L. Dotto. Aachenosaurus multidens, Bull. Soc. Belge Géol. ii. 1888, p. 300. 
G. Smers. Un mot de réponse 4 M. L. Dollo. Hasselt, 1889, 8vo. 13 pp. 
