50 
The American Geologist. 
January, 1896 
Liostrcccics costatus is represented with a dorsal suture quite different 
from that given by Angelin. Herr Wallerius takes exception to the 
writer’s exclusion of this species from Liostracics and the limitation of 
the genus to the species with spineless cheeks, found in the basal layers 
of the Paradoxides beds.* But it is only in this way that the use of 
the generic name can be maintained and defended, as will be seen if 
any one will compare L. costatus as figured by Wallerius with Pty- 
choparia stria,tus Corda, the type of Ptyclioparia. L. costatus is 
evidently a Ptyclioparia, and this genus has precedence of Liostracus 
by eight years. 
Herr Wallerius confirms the reference of the A. laevigatus zone to 
the Paradoxides beds by showing the presence in these slates of a form 
of Paradoxides tessini (forma 4 ‘ incerta.”) 
A form of Agnostics planicauda Ang. is described which differs from 
that figured by Tullberg in having the cheeks grooved in front. This 
would take the species out of the section limbati, where Tullberg placed 
it, and relegate it to longifrontes, where it would fall if one may judge 
by Angelin’s figure. Tullberg’s form would then be a variety, the 
type being in the longifrontes section. 
The brachiopods figured by Herr Wallerius are allied to the ordinary 
forms of the Paradoxides beds. The Obolella (if flattened by pressure) 
would appear to belong to that section of the genus now set off by 
Walcott as Linnarssonia. The Lingula, by its outline and prominent 
beak, would seem to resemble the genus Lingulella. The three 
Hyolithi (to judge by Lindstrom’s list, above cited) are a new feature 
of this zone. 
The following are the species and forms which Wallerius found in 
the A. kevigatus zone of West Gotland : 
Agnostics Iceviggtus Dalm. 
A. Icevigatics, form armata Linrs. 
A. exsciclpatus Ang., f. sulcifera. 
A. exsciclpatus, f. Integra. 
A. planicauda Ang., f. vesti- 
gothica. 
A. pi si for mi Lin. 
A. fallax Linrs., f. ferox Tullb. 
A. fallax, var. insignis. 
Conocephalites suecicus. 
Acroceplialites stenometopus 
(Ang. sp.) 
Procevatopyge coni fro ns . 
Toxotis pusilla. 
Paradoxides tessini Ang., f. in- 
certa. 
‘ c Leperditia ” primordialis Linrs. 
Lingula, agnostorum. 
Obolella parmcla. 
Acrotreta socialis v. Seeb. 
Ortliis exporrecta Linrs. 
Hyolithus affinis Holm. 
H. obscurus Holm ? 
H. sicbcostatns. 
Liostracics costatus Ang. 
The species and forms in the above list not otherwise indicated are 
new ones described by Wallerius in this memoir, and its author is to be 
congratulated on having added so many interesting and novel types to 
the fauna of the A. lmvigatus zone. G. F. Matthew. 
*Cf.: Illustrations of the fauna of tlie» St.-.John group, No. IV, Trans. Royal Soc. 
Canada, vol. 5, sec. IV. op. 185, 186,1888. 
V 
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