Reviczv of Recent Geological Literature. 59 
Sveriges iilsta kCinda 7>//i9(5i//^r, af Jno. Chr. Moberg (Geol. Foren, 
i. Stockholm Forhandl. Bd. 21, Hft. 4, 1899). 
Some vears ago (1892) Dr. Moberg gave a short description of two 
species of Olenellus, which had been found in Skania in Sweden. In 
this article he gives a full description of these species, and refers one to 
the genus Holmia and the other conditionally to Schmidtia. 
In connection with the study of these two trilobites he finds it neces- 
sary to revise the genera or subgenera, which have been taken out of 
(or established under) Olenellus. 
In speaking of Olenellus in the extended meaning of the word, and 
of the separation of this group as a separate family from Paradoxidse, 
as proposed by Mr. Walcott under the name Mesonacid^, Moberg 
urges that the name should be Olenellidae, as there is no more danger 
■of confusing this with OlenidcC than of confounding Olenellus with 
Olenus. 
Moberg adopts the divisions of Olenellus (sensu lato) as genera, mak- 
ing six types; viz: 
Ellipsocephala asaphoides Emmons. 
Olenellus THOMPSONi Hall, to this he would attach O. lapworthi 
and O. reticulatus Peach. 
• Mesonacis vermontana Hall. 
Holmia kjerulfi Linrs., to this are added H. broggeri Wale, 
H. callavii Lap. and H. limdgreni Moberg. 
Schmidtia mickwitzi Schmidt, to which may probably be referred 
S. torelli Moberg. 
Olenelloides ar.matus Peach. 
In reference to the above it may be observed that in place of Ellip- 
socephala Emmons, Moberg proposes the generic name Georgiellus. 
This seems unnecessary as there is no need of confusing Ellipto- 
cephala with Ellipsocephalus, and Emmons is best honored by retaining 
his own name. 
Also it may be observed that there are two types under Holmia, the 
first two species mentioned being distinguished from the type by a dif- 
ference in the number of segments in the thorax, and by possessing a 
conical in place of a club-shaped glabella. 
Three excellent plates accompany the article. On the first are 
shown the six types or genera of the Oilenellidas recognized by Moberg, 
on the second the various parts of Holmia hmdgreni, and on the third 
the parts of Schmidtia (?) torelli. G. f. m. 
Ndgra Calcitkristaller frdn Nordmarken af Jno. Chr. Moberg. 
(Geol. Foren i. Stockholm Forhandl., Bd. 21, Hft. 4, 1899, i plate.) 
In this article are described some peculiar calcite crystals; thev are 
slender four-sided pyramids, on which are perched small six-sided 
prisms. G. F. M. 
Palaontologiska no User af Gerhard Holm, //. Om Bathmoceras. 
(Geol. Foren i. Stockholm Forhandl., Bd. 21, Hft, 4, 1899). 
In this paper Dr. Holm describes very fully the structure of a rare 
and peculiar Ordovician genus of cephalopods, found at the horizon of 
