G'eographical Distribution of Crustacea. 19 
. Among the Calanidz, the genera are mainly tropical, yet each 
affords some extra-tropical species; and those which are most 
abundant in the colder waters are Calani or closely allied. — Se- 
tella occurs beyond the tropics; but all the species thus far ex- 
amined are found in the 'l'orrid zone.  Pontella is more of a 
warm-water genus than Calanus. "'l'he Corycaide are to a large 
extent tropical ; the genus Corycaeus is almost exclusively so, 
while Sapphirina is common in the 'lemperate zone. 'The 
Steropine are F'rigid species. 
Although the Calanid&e are more varied in species within the 
tropies, they abound more in individuals in the colder seas. . Vast 
areas of * bloody" waters were observed by us off the coast of 
Chili, south of Valparaiso (latitude 42? south, longitude 789. 45' 
west, and latitude 369 south, longitude 74? west), which were 
mainly due to a species of this group; and another species was 
equally abundant in the North Pacific, 329 north, 173 west.* 
"hey have been reported as swarming in other seas, constituting 
the food in part of certain species of whale. Such immense 
shoals we did not meet with, within the tropics. 
Among the Daphnioidea, the genera Daphnella, Penilia, Ceri- 
odaphnia, and Lynceus were observed by us in the 'l'orrid zone. 
Of the Cyproids, Cypridinia, Conchecia, and Halocypris are 
oceanie forms, and mainly of the tropical oceans. 
The Calizoids spread over both zones. Caligus and Lepeoph- 
theirus reach from the equator to the frigid seas; Nogagus, Pan- 
darus, and Dinematura are represented in both the "l'orrid and 
'Temperate zones. 
GENERAL REMARES AND RKECAPITULATION. 
We continue by presenting a few general deductions from 
the tables, and a recapitulation of some principles. 
A survey of all the great divisions of Crustacea, shows us that 
exclusive of the Entomostraca, they are distributed, according 
to present knowledge, as follows :, 
a. lTorrid zone. b. Temperate zone. c. Frigid zone. 
Brachyura,  . i 535 25'1 (34 a) 2 (5 6) 
Anomoura,  . : 125 110 (15 a) 4 (1 5) 
Macroura, : - 148 125 (16 a) 29 (2 5) 
Anomobranchiata, . 89 33 (9 a) 2 
Isopoda, . : : 56 208 (12) 21 (3 5) 
Anisopoda,  . : 8 34 15 
Amphipoda, . ; 82 15' 83 (4 5) 
Total . 4.1086 924 ('16 a) 159 (14 b) 
'lr'aking the sum of the Frigid and 'Temperate zone species 
(subtracting the fourteen common to the two) we have 1036 spe- 
cies in the torrid regions to 1069 in the extra-torrid, seventy-five 
* The species in the former case was the Pontella (subgen. Calanopia) brachiata ; 
and in the latter, Calanus sanguineus. 
