Reviews — G. F. Mattheiv — Paradoxides Beds. 139 



II. — Faunas of the Paradoxides Beds in Eastern North 

 America, No. 1. By G. F. Matthew.^ 



IN this article, which deals with the smaller crustaceans, including 

 the genera Agnostiis and Microdiscus, there is a definite attempt 

 to correlate the several subfaunas of Paradoxides which occur in 

 America with those found in Europe. Of the six subzones into 

 wdiich the Paradoxides beds of Sweden have been divided, the above 

 author recognizes four as existent in America. Of these the second 

 has been recognized by its fauna in New Brunswick, Newfoundland, 

 and Massachusetts ; the first has been found only in the province 

 first-named, and the fourth in Newfoundland. 



Some facts relative to the development of the larval forms of 

 Agnostus and Microdiscus are given, which indicate a nearer re- 

 lationship between these genera than is apparent from the adult 

 individuals. The pygidium in Agnostus, as shown from the larv^, 

 had three stages of growth ; the earliest marked by the posterior, 

 obscure somites of the posterior lobe of the rachis, the second by 

 the two anterior somites of the same lobe, and the third by the 

 two anterior lobes of that rachis. In the head-shield the occipital 

 ring is usually quite aborted and the true posterior lobe largely 

 suppressed ; the so-called posterior lobe is thus a fusion ot the 

 middle lobes of the glabella. The anterior lobe becomes more 

 definite and prominent than in most trilobites. 



A new species of Microdiscus of the Olenellns fauna is described, 

 differing in its short glabella (and cephalic shield) from the other 

 Microdisci of that fauna; attention is called to the resemblance of 

 its head-shield to that of the forms with long occipital spines that 

 are prevalent in the Paradoxides beds, and the suggestion is offered 

 that it may be of the same stock as that from which they are 

 descended. The Microdisci of the Olenelhis and Paradoxides beds 

 are classified in this article and divided into subgenera, their re- 

 lation to each other being shown by an analytical table, descriptive 

 of the various parts of the head-shield and pygidium. Stenotheca 

 of Salter is claimed to be crustacean, and Plumulites of Barrande 

 is said to occur in the Paradoxides beds of Newfoundland. Four 

 plates, with full descriptions of the figures, accompany the article. 



lasii^OK-TS ^^isTZD i=s,og:b:eidii>tc3-S- 



Geological Society of London. 



L— January 20, 1897.— Dr. Henry Hicks, F.K.S., President, in 

 the Chair. The following communications were read : — 



1. " On Glacial Phenomena of Palaeozoic Age in the Varanger 

 Fiord." By Aubrey Strahan, Esq., M.A., F.G.S. 



The Gaisa beds of the Varanger Fiord consist of slightly altered 

 quartz-grits, with red sandstones and shales, and rest upon a deeply 

 denuded surface of the metamorphic rocks. In a section, first noticed 



1 Trans. New York Acad. Sci., vol. xy, sig. 12, August 3, 1896. 



