18 Geographical Distribution of Crustacea. 
species of the group.* Moreover, no Daphnioids and few Cal- 
igoids have been yet reported from the 'l'orrid zone, excepting 
those described in this Report. "'Tlhe author's time when on land 
in the tropics was devoted mainly to the department of Geology, 
and consequently the fresh-water Entomostracans were not as 
thoroughly collected as those of the oceans. He therefore at- 
tempts to draw no conclusions from the above ratios. 
A few facts may, however, be deduced with respect to some 
zenera, and especially those of the Cyclopoidea. 'Tl'he following 
table gives the number, as nearly as known, of the species of 
each genus of the Cyclopoidea, occurring in the torrid and extra- 
torrid zones. "'TI'he number common to the extra-torrid and torrid 
zones is mentioned in brackets. 
TABLE V. 
CYCLOPOIDEA. 
'lTorrid. — Extra-torrid. Torrid. Extra-torrid. 
I Carawrpa. 2. Harpacticine, . | 
1. Calaninc. Canthocamptus, 2 4 
Calanus, . . 25 12 (3) Harpactieus, . 15 
Rhinecalanus, 2 Westwoodia, . 1 
Cetochilus, . 1 Alteutha, 1 
Euchsta. . 4 1 Metis, . : 1 
Undina. 3 Clytemnestra, . 1 
2. Oithoninc. Setella, . 5 1 (1) 
Ohona, 7 —. 2 1 Laophon, 1 
8. JPontellinc. Once; ^. - vex 1 
Diaptomus, . . 2 JEnippe, .. . 1 
Hemiecalanus, . .4 TOR As e, decr TER 1 
Candace, 5 1 9. Steropinc. 
Aecartn, ^ Dv 2478 1 Zaus, 1 
Pontella, . . 22 9 (3) Sterope, 4 
Catopia, 1 
4. JNotodelphine, III. Cogvoxrp ae. 
Notodelphys, . 1 l. Coryccinc, 
Coryczeus, DL 1 
* Ananas, (0255. 1(1) 
Copia, ^5 ME 
IL CroroPm. Sapphirina,  . 15 b 
1. Cyclopina. 92. Miracinc. 
Cydops . . 2 9 Miracia, ^. . 1 
? Psammathe, . 1 
? Idomene, 1 TotalCarawimpng, . . "1 29 (6) 
? Euryta, . 1 Total CycroPipm, . . 10 44 (1) 
Total Conxcxirnm, |. 39 8 (1) 
'The properly oceanie genera include.all the Calanide, ex- 
cepting Daptoimnus and. Notodelphys ; all the Coryceide ; with 
only the single genus Sete//a among the Cyclopidae. 
* 'The whole number of Cyclopoidea described previous to May, 1842, by which 
time the author's observations were completed, was less than fwenty-five; and of the 
oceanic Cyclopoids, one hundred and fifty species of which the author has described, 
not ten were then known. 'We may judge from these results of a single cruise what 
still remains to be done in the department of Entomostraca, | 
nonc C De cce 
