76 Setentific Intelligence. 
or less imbricated plates. - _ general account of this group 
its possible relationship with t e Paleozoic echini is discussed, in 
a very suggestive way a curious Pourtalesiw, seven genera 
and thirteen species new) are described, all rom 
deep water, and ne 2 all from the sonthern hemisphere 
t ber of species emai from this collection is 
139, of which 52 species and 15 genera were new. e total 
number of existing gore included in the agg 90 lists is 
297, belonging to 107 genera. This is an increase of 90 species 
enera over these included in the author’s Revision of 
Echini (1872-4). Ofs e ockeiet number, 201 known aon are re- 
them ranging below 350 fathoms, often to 1000 fathoms, 12 
descending even to more than 2000 fathoms; but these oceanic 
2900 fathom 
apres Geographical Distribution of certain Jrosivinater 
dislike of North America, and the probable causes of their vart- 
ations; Db . G. WerrHErsy AM. Journal Cincinnati Soe. 
waters—the seo 3h Strepomatide, with reference to con- 
clusions as to the origin of the species to be iar nena in another 
The pithoecill points brought out are as follow 
o species of the Strepomatide and but few of. she Union- 
ide occur in New En reed and the latter, so occurring, are spe- 
cies of many varietal forms found elsewhere on the Atlantic 
slope; a few of them only having a wide westward and_ south- 
mt 
ber, of which 70 are ) ‘species of Unio, 17 fargaritana, and 5 
of Anodonta ; these Ohio types extend ah of this stream to the 
limits of the Mississippi drainage, and south and southwestward 
fn Western Texas; while the Gucoucmsciehdes are few over this 
rea. 
species of Unionide and new genera and species of 
Suopormihi appear on crossing the Ohio and going south. 
The new forms begin to appear in —— and continue 
