180 
Order METALLATA. 
Suborder A. METALLOMETALLINE A. 
Tribe 1, METALLOIDE (Metals, alloys, metallic Se and P). 
« 2. GALENOIDE, including three subtribes : 
a. Thiogalenoidee ; Thionites, Thiophyllites. 
b. Selenogalenoidee ; Eucairites. 
c. Tellurogalenoidee ; Tellurites, Tellurophyllites. 
. BOURNONOIDE® ; Bournonites, Emplectites. 
. PyriTorpEa ; Pyrites, Pyritinus. 
. SMALTOIDE# ; Smaltites, Algodonites. 
. ARSENOPYRITOIDE ; Arsenopyrites. 
a Ok PB CO 
Suborder B. SPATOMETALLINE &. 
Tribe 7. SPATOMETALLOIDE® (Sulphur, non-metallic Se and P). 
“« 8. SPHALEROIDEA ; Sphalerites. 
« 9. PRroustoipE# ; Pyrargyrites, Tennantites. 
The writer has prepared tables, giving for each species in the order of 
the Metallata besides hardness, specific gravity and crystalline system, the 
chemical formula, represented by a simplified notation, as indicated in 
§ 38, together with the unit-value for p, and the value of o calculated 
therefrom. For each species moreover, besides its trivial designation, are 
given its generic and specific Latin names. Thus, for example, we 
have for the species above named under the genus Pyrites ; P. cubicus, 
P. prismaticus, P. cobalteus, P. niccolocobalteus, P. cuprocobalteus and 
P. rutheneus ; while the named species of Pyritinus are ; P. ferrosus, P. 
magneticus, P. manganeus, P. niccoleus, P. ferroniccoleus, P. cupreus, 
P. subcupreus and P. stanneus. Again, the above-named species of the 
genus Sphalerites are; S. zinceus vulgaris, 8. zinceus hexagonus, 8. fer- 
rozinceus, 8. manganeus, 8. calcareus, 8. mercureus and 8. stibeus. A 
similar task, except so far as regards generic and specific names, has 
already been accomplished for the order of the Silicates in the essay 
published in 1886, already cited, and is now well advanced for most of 
the other orders. When completed, the whole will be published with 
explanatory and critical details, as a Systematic Mineralogy, to be fol- 
lowed by a Descriptive Mineralogy. 
_naesaaemnentemnt tci 
