Review of Recent Geological Litef^atiire. 189 
a new species of trilobite from Jemtland, described and figured by Linn- 
arsson (Geol. foren. forh., Bd. 2, s. 495, 1875?), and by him referred witli 
doubt to Barrande's genus Bohciuilla. The author describes the revis- 
ion of Barrande's work on the genus Bohemilla and family Boheniillidic 
made by Dr. C.E. Beecher, based upon specimens in the Museum of 
Comparative Zoology, at Cambridge, Mass., wherein he affirms that there 
is no satisfactory basis for the genus Bohemilla and iarmWy Bo/ie//iillicla-. 
Of this determination of Beecher, Dr. Holm appears to approve. 
The specimens which authenticate the species Bohemilla (?) dentic 
ulata of Linnarsson, consist of a head and a pygidium preserved in th • 
Swedish geological musem, at Stockholm. Dr. Holm, declares that this 
species agrees better with the genus Angelina, of Salter, than with any 
other, and so refers it. He also refers to A. (or B.) dniticitlata the pyg- 
idium connected by C. Wiman with Telephus bicuspis Ang. 
Another species from the same horizon and district, Remopleurides 
microphthalmus Linrs. should according to Dr. Holm be referred to Di- 
cellocephalus. He figures also a head for ^ngelin's Centropleura serra- 
ta, and claims that this also should be included in Dicellocephalus, as 
has been done by other authors. There is quite a close resemblance 
between this species and D. fiitalis Walcott of the Eureka district, Ne- 
vada, as Dr. Holm points out. 
But the advantage of referring these Ordovician species to Dicello 
cephalus, without limitation is questionable; they have not the cylindri- 
cal glabella with transverse furrows of the typical species of Dicello 
f^//i«/;^.y of Owen and Hall. None of these species as shown by Hall 
("Preliminary notice of the fauna of the Potsdam sandstone." of the 
upper Mississippi valley) have more than two spines on the pygid- 
ium. See also Trans. Roy. Soc. Can., Vol. X, p. 11. 
While Dr. Holm has transferred one of Linnarsson's species of this 
fauna of Jemtland to the above genus, he has removed another from it. 
D. billingsi is transferred to the subgenus Paraholinella of Brogger. A 
complete example also enables Dr. Holm to assert that the Triarfhriis 
jemtlandicics of Linnarsson is the same as Triarthrus becki Green. 
5. ''On the apex of tlic shell in Lituites." Sections of the shell 
of Lituites perfectus Wahl., of which figures are given, show the pecul- 
iar courses of the siphon. It begins on the outer margin of the first 
chamber, and about the fourth or fifth chamber becomes central; subse- 
quently it works still further towards th? inner side of the shell, and for 
the first whorl is about a tliird from this side; subse(|uently it becomes 
more central. 
6. "On the Occurrence of a Pterygotus in the Upper Silurian of 
Dalecarlia." Dr. Holm says fragments of a species of this genus were 
collected by (i. von Schmalensee from a dark grey limestone in the 
above district in 1895, He refers the specimens to the species P. 'sin- 
ensis Fr. Schmidt. 
Dr. Holm's article is accompanied by two e.vcellent plates showing 
D. microphthalmus, D. serratus and Lituites perfectus. G. f. \i. 
