Geographical Distribution of Crustacea. 317 
If we examine into the subdivisions of the Maioidea and Can- 
croidea, we shall find the difference between the two groups in 
distribution more strikingly brought out. We shall find, more- 
ver, that both groups may be divided into a warm-water an 
cold-water section, as below. 
I, MAIOIDEA. 
1. COLD WATER OR TEMPERATE ZONE SECTION. i 
Torrid Temperate 
species. species, 
1. Inachide, 7 . Y ; ‘ ‘ 10 
2. Maiide, subfamilies, Libinine, Maiine, Pisine, Othonine, 15 35 
3. Eurypodide : : ; : oe 
4 
ie : 7 
. Leptopodide, . ‘ : ‘ ‘ t 1 8 
17 60 
2. WARM WATER OR TORRID ZONE SECTION. 
Torrid. Temperate. 
1 > 
1. Maiide, subfamilies Micippine, Chorinine, Pyrine, 6 
2. Mithracide, : j : ; : : 11 6 
8. Tychide, = ‘ . . . i Te 
4. Periceride, ‘ - 2 < ‘ 43 14 
5. Parthenopinea, 8 ‘ je ; . ee 8 
6. Oncininea, : * 2 0 
104 31 
II CANCROIDEA. 
1. TEMPERATE ZONE SECTION. 
Torrid. ‘Temperate. 
Cancride, : ‘ ~ ‘ae 11 
Platyonychide, . . . : 2 7 
Portunide, subfamily Portunine, : : . ee, 15 
Cyclinea, . 4 5 : si : : 0 1 
2 34 
2, TORRID ZONE SECTION, 
Torrid, Temperate. 
16 
Xanthide, (i j ; 3 : . 129 
Eriphide, . : cient : : cee io oe 
Portunidew, excluding the Portunine, . P ; . 52 7 
Podophthalmide, . ; : ‘ ; 2 0 
227 35 
We have here two singular facts brought out. 
irst, that the cold-water section of the Cancroidea embraces 
the species that are highest in grade, and largest in size. It is 
headed by the Macrocheira of Northern Japan, the king of all 
crabs, whose body is seventeen inches in length and a foot broad ; 
