APPENDIX. 119 



After I had brought my work to a conclusion, and was engaged in preparing the index, 

 I received the second series of the ' Magazin für Naturvidenskaberne,' (second series from 

 1S32, vols, i and ii.) This series contains some remarks by Esmark on the following five 

 TrUobites ; see vol. i, p. 268, Tab. VIII. 



1. Tril. Asellm, a ten-jointed Trilobite, incapable of rolling itself up (Fig. V), with 

 a large caudal shield, the axis of which is wanting, but which nevertheless seems to be 

 many-jointed. Boeck represents this species in Keilhau's Gaea Noncegica (1 Tril. No. 36), 

 placing it next to Illcenm cculrofiis, Dalm., but between this and Esmark's figure there is no 

 resemblance. 



2. Tril. ellijüifrons, p. 269, Figs. 6, 7, a Phacops, with an undivided, narrow glabella, 

 which seems most nearly to resemble that of Ph. lati/rons, but which, perhaps, differs 

 from it specifically in the narrow shape of the glabella, if the figure be correct. Boeck, 

 who treats of this species (/. c. No. 1), likewise distinguishes it from Ph. lutlfrons, his Tril. 

 elcgans ; Sars (ibid. No. 2, " by the wide (long ?) elliptical glabella." Both arc found at 

 Malmöekalven. 



3. Tril. spharicus, Fig. 8, according to Boeck, (/. c. sub No. 14,) is identical with Tril. 

 clavifrons, Sars, concerning which I have already expressed my opinion (see ante, p. 99), 

 connecting it with Dalman's species of the same name. But Esmark's figure exhibits 

 three furrows on the glabella, and I am therefore still in doubt whether Tr. spharicm can 

 really be Sars' Tr. clavifrons. If, however, this be the case, it would belong to Ctjphaspis 

 clavifrons. 



4. Tr. semilunaris, Fig. 9, according to Boeck's conjecture, (/. c. sub No. 10,) is only a 

 small individual of Phacops caudatus. (See ante, p. 94.) 



5. Tr. dentatus. Fig. 10, is a large caudal shield, with a many-jointed axis, and three 

 large lateral ribs curved backwards (the figure indicates 15 rings, and an oval terminal 

 joint) ; the ribs project over the margin of the shield in the shape of obtuse spines. Boeck 

 adds (/. c. sub No. 7), that the semicylindrical glabella, which is rounded at the anterior 

 part, has three lateral furrows, and that the posterior angles of the shield terminate in 

 spines like the lateral lobes of the body rings. This species, therefore, is decidedly a 

 Phacops of the division B d, and approximates to Pliac. arachnoides. From these state- 

 ments there appears now to be scarcely a doubt that it belongs to Dr. Loven's new 

 genus Ci/helc. 



I likewise only received the work of F. A. Römer, mentioned at the conclusion of the 

 bibliography, very recently. The author describes in it the following Trilobites : 



1. Brontes flabellif er, p. 37, Tab. II, Fig. 1. 



2. Br. signatus, ibid. p. 37, Figs. 2, 3 ; citing also Phillips, Paleozoic fossils. Tab. LVII, 

 Fig. 255 ; a caudal shield of a shorter, more circular, form. 



Br. (?) glahratus, ibid. Fig. G. The central piece of a cephalic shield possessing the 

 shell, but otherwise without satisfactory characters. 



4. Calymene Jordani, ibid. Fig. 4, certainly only a specimen of Phacops latifrons. - I have 

 a well-preserved specimen of this species lying before me (from the collection at Halle), 

 which was found in the ground of the monastery at Michelstein, near Blankenburg. Römer 

 also refers to this specimen (p. xviii of his work). 



