130-2 
THE VOYAGE OF H.M.S. CHALLENGER. 
.Votes on the (Geographical Distribution. — An examination of the foregoing Jist shows 
that of the 412 species taken in this zone between 1500 and 2000 fathoms, 274 species 
(or 07 per cent.) were taken south of the southern tropic, 101 species (or 25 per cent.) 
were taken within tlie tropics, and 137 species (or 33 per cent.) were taken north of the 
northern tro[)ic ; while 30 .species (or 7 per cent.) were found to be common to all those 
three arciis, 18 species (or 4 per cent.) were common to the southern and northern areas, 
13 species (or 3 per cent.) were common to the tropical and northern areas, and 20 
s[>ecies (or 5 per cent.) were common to the southern and tropical areas. 
4. ANI.MAL.S OBTAINED IN THE DrEDGINGS AND TkAWLINGS IN DePTHS BETWEEN 1000 
AND 1500 Fathoms. 
The Challenger dredged or trawled at 25 Stations where the depth was between 1000 
and 1500 fathoms, about 2000 specimens being procured, belonging to about 600 species 
anil about 400 genera. The total number of species and genera actually described and 
recorded in the Zoological Reports from the zone between these depths amounts to 508 
species and 327 genera, of which 365 species (or 72 per cent.) and 83 genera (or 25 per 
cent.) are new to .science, as shown in the following list. Those species taken by the 
Challenger in this zone only (numbering 277 species, or 55 per cent.) are indicated by an 
asterisk thus.* The geographical distribution of the species is indicated by the heavy letters 
S, T, and N, used to denote that the species was taken south of the tropic of Capricorn 
(S), between the tropics of Capricorn and Cancer (T), or north of the tropic of Cancer (N). 
I)ekp-Sea Keratosa : 
Dsammimi globigeHna, n.g., n.sp. T 
•Monaxonida : 
Dhaldlia ventilaln'uni (Johnston), var. 
connexiva, nov. S T 
Uhizochalina Jistulosa (Bowerbank). N 
Tentorium semi siibe rites (Schmidt). S N 
• Trichostemnui sarsii, n.s}>. T N 
Tctkagtinkllida : 
.izonca pjeill’erw. Carter. T N 
* /.tops imchgdermofri, n.sp. N 
• Tetilla satulalinn, n.sp. N 
Tftenea schmultii, n.u. T N 
* .. weight a, n.sp. S 
.. «p. (?). T 
Hexactinellida : 
Ajyhrocallistes bocagei, Wright. T N 
Aulocalyx irregularis, n.g., n.sp. S 
Chonelasma lamella, n.g., n.sp. S N 
* „ sp. (?). N 
Dactylocalyx [1) patella, n.sp. N 
* Euplectella nodosa, n.sp. N 
,, suberea, n.sp. T N 
* T'arrea sp. (?). S 
Ilolascus Jilndatus, n.g., n.sp. S 
* Ilyalonema p^ociduni, n.sp. S 
* ,, (Styloculyx) thomsom, 
I Marshall, var. exiguiini, 
nov. N 
j * „ , two species undeter- 
mined. T 
