62 The American Geologist. January, V6S>i 
the outer phell of the conch, forming within a series of the first loculi a 
quickly expanding initial cone, likewise again decreasing in size to its 
noriiuil dimension. The first loculus therefore includes the apex itself. 
In some fcjrms of Suecocema the apical cone is ;v little curved, Cyrto- 
ceras-\ike, towards the siphonal side, the xjoint of greatest curve coin- 
ciding with, or a little forward of, the siphon's point of greatest diam- 
eter. 
The following species are described: Endoceras (Nan)w) aulema 
(Clarke), E. (Nanno) belemnitiforme Holm, E. \ N anno) fiat ula Holm, n. 
sp., E. (Nanno) pygmmum Holm, n. sp., E. [Suecoceras) barrandei 
Dew., E. [Suecoceran) gibbum Holm, n. sp.. E. [Suecoceras) recurvum 
Holm, n. sp., E. (Suecoceras) dux Holm, n. sp., E. (Suecoceras) sp., E. 
(Suecoceras) papilla Holm, n. sp., E. (Suecoceras) marcoui Barr. 
F. W. S. 
Faunas of the Pai-adoxides Beds in Eastern Noi-tJi America — Ao. 1. 
By G. F. Matthew. (Trans. N. Y. Acad. Sci., vol. xv, Aug. 3, 1896, pp. 
192-247.) In his introduction to the paper on the Protolenus Fauna* 
the above author outlined the subfaunas into which the American Par- 
adoxides fauna may be divided. More detiniteness is given this view of 
the life of the middle Cambrian by showing the sj)ecies which are pe . 
culiar to each subfauna, so far as they are described in this article. 
Only the smaller crustaceans are dealt with in this paper, which is 
valuable especially as giving a full account of the species of Agnostus 
and Microdiscus as they appear in the Paradoxides beds of America. 
A good many European species of Agnostus are lecognized as occur- 
ring in these beds, either in their European form or as varieties, show- 
ing the close relation that existed during Middle Cambrian time, 
between the faunas on the two sides of the Atlantic. Some points 
interesting to the biologist are made out by a study of the development 
of the larva in Agnostus. The earlier moults show a near resemblance 
to other trilobites of the Paradoxides beds. This resemblance is appa- 
rent in the form and details, both of the headshield and pygidium. As 
regards the latter it is said to show three stages of development during 
growth. 1st, The early larval stage — nonagnostiform — when it posses- 
sed 1-3 somites; 2d, the later larval stage— ■ agnostiform — when it had 
about 4-5 somites; 3d, the adult condition when it had about 6-7 
somites and the three main lobes of the rachis were developed. Of 
these somites, 4-5 were in the posterior lobe of the rachis of the pygid- 
ium. The special features of the sections of Agnostus designated Par- 
vifrontes and Loivigati by Tullburg resulted fi-om the progressive 
effacement of those of the earlier types, presumably impressed in early 
larval stages. 
The species of Agnostus recognized as occurring in the middle Cam- 
brian of eastern North America are the following: 
Regii, a. regulus Matt.; A. rex Barr., var. transectus, n. var.: Fal- 
LACES, A. faliax Linrs., var. vir Matt., var. concinnus Matt., var. trilo- 
*Trans. N. Y. Acad. Sci.. vol. xiv. Mar. 17, 189.5. 
