NARRATIVE OF THE CRUISE. 
619 
known. The Caprellina, though few in number, contain the notable new genus Dodecas, 
which is unlike all the other genera of Caprellidae in the number of the feet attached to 
the peraeon or thorax ; of these there are six pairs. Those of the fourth segment are 
wanting, while those of the fifth segment are rudimentary, and those of the third but 
feebly developed. In the arrangement of the Caprellidae, according to the scale of 
completeness with which their thorax-feet are developed, 1 Dodecas will obviously stand 
after Proto with its seven pairs fully developed and Protella with its five complete and 
two rudimentary pairs. It will as obviously stand before Caprellina (G. M. Thomson’s 
genus, not to be confused with the divisional name above given) and Podalirius, which 
have four well-developed pairs and one rudimentary. But whether it should stand before 
or after Cercops, JEgina, JEginella, and Caprella , each of which has five fully- developed 
pairs of feet, though those of the third and fourth segments are wanting altogether, is a 
question that may require some consideration and debate. By having more than two 
joints in the flagellum of its lower antennae, it will stand with Proto and Caprellina 
apart from the rest of the group, and again, on a third principle of classification, by the 
presence of a mandibular palp and of branchiae on the second, third, and fourth segments 
of the peraeon, it will be united with Proto , Caprellina, and Cercops. 
“ Like the Caprellidae in general, the new species Dodecas elongata is very slenderly 
built, in thickness resembling a thread or piece of fine twine. It attains, however, the 
exceptional length of 3 inches, half of that measurement 
being constituted by the hind legs and the long upper’ 
antennae. 
“ In contrast with the tenuity of the species just 
mentioned we have the dimensions of Andania gigantea 
here figured of the natural size (see fig. 207). Two speci- 
mens of this bulky Amphipod were obtained between 46° 
and 47° south latitude, the larger at a depth of 1875 
fathoms, the smaller some 200 miles from the other at a 
depth of 1600 fathoms. Two other species of Andania 
have been brought home by the Challenger, one of them 
from lat. 8° 37' S., long. 34° 28' W., where the depth was 675 fathoms ; the other, from 
lat. 40° 28' S., long. 177° 43' E., where the depth was 1100 fathoms. The three species 
of the genus hitherto known are the type species Andania abyssi, A. Boeck, Andania 
nordlandica, A. Boeck, and. Andania' pectinata, G. O. Sars. The specific name of the 
type species would have better suited one of those from the southern waters. Looking 
to the various places of capture, it would seem that the genus is suited for life at very 
considerable depths. In point of size the members of it exhibit great variations, 
since Andania gigantea is one of the largest of the known Amphipods, while the three 
1 Mayer, Dr. P., Fauna u. Flora d. Golfes v. Neapel, vi., Die Caprelliden, p. 8, Leipzig, 1882. 
Fig. 207. — Andania gigantea, SteM>ing. 
