10 Geographical Distribution of Crustacea. 
VI. ENTOMOSTRACA. 
The Entomostraca have been little studied out of the Tem- 
perate zone, if we except the results of the author’s labors. The 
described species of most of the families are, therefore, almost 
exclusively from the temperate regions, and we know ‘little. of 
the, corresponding species or groups in the warmer seas. The 
following table presents the number of known species of the tor- 
rid and extra-torrid zones, omitting the Lernzoids :-— 
TABLE IY. " 
Torrid zone. Extra-torrid zone. 
Loruyropopa. 
Cyclopoidea, , ; : ‘ 120 76 
Daphnioidea, s . : : a 46 
Cyproidea, : , : ‘ ‘ 13 61 
PHYLLOPODA. 
Artemioidea, : 0 10 
Apodoidea, 0 3 
Limnadioidea, 2 2 
Pacitopopa, 
Ergasiloidea, ; - : : oe 4 
Caligoidea, “ : : F . 16 33 
Were we to leave out of view the researches of the author, 
the aalias of species and the proporen for the Cyclopoidea, in- 
stead of 120 to 76, would be about 3:50, thus not only revers- 
ing the ratio, but giving to a ‘Capper zone almost all the 
species of the group.* Moreover, no Daphnioids and few Cal- 
igoids have been yet reported from the Torrid zone, excepting 
those described in this Report. The author’s time when on land 
. = was devoted mainly to the department of Geology, 
onsequently the fresh-water Entomostracans were not as 
thorough collected as those of the oceans. He therefore at- 
tempts to draw no cciiel usions from the above ratios. 
A few facts may, however, be deduced with respect to some 
genera, hg especially those of the Cyclopoidea. The following 
table gives the number, as nearly as known, of the species of 
each rates of the Cyclopoidea, occurring in the torrid and extra- 
torrid zones. The number common to the extra-torrid and torrid 
zones is mentioned in brackets. 
* The whole number of Cyclopoidea described previous to a oe doit bier 
time the author's observations were completed, wi po dar 
oceanic s0ids, one hundred and fifty species of mone nit 
‘not ten were known. We cee fom t thon ore of ingle mat 
still ee be done in the department of 
