EEPORT ON THE HOLOTHUEIOIDEA. 
7 
land outwards would seem to have in general a greater uniformity in temperature and 
other physical conditions than in the tropical and subtropical regions, Avliere it is stated 
that the belts below 100 or 200 fathoms have lost the influence of the climate, &c., and 
present conditions far diflferent from those above them. Such forms are Myriotroclius 
rinkii,hom shore to 500 fathoms; Ecliinocucumis typica, from about 40 to 530 fathoms; 
Thijone raphaniis, from 20 to 530 fathoms; Holothuria intestinalis, from 10 to 650 
fathoms ; Holothuria tremula, from 20 to 672 fathoms ; Trochostomaviolacea, from 20 to 
700 fathoms; Thy onidium pellucidiim, from uhout 30 to 1081 fathoms, &c. The two 
deep-sea species of Synapta are scarcely distinguishable from some of the shallow-water 
species. 
5. PoBlopatides, Pseudostichopus, Acanthotrochus, and probably even Ankyroderma 
are the only true deep-sea genera of Apoda and Pedata, no representatives of them 
having hitherto been obtained near the shore or, at least, from any trifling depth. Species 
of these genera very seldom seem to thrive at a less depth than 500 fathoms. 
6. Among the Apoda the Synaptidse are, with a very few exceptions, shore forms, 
living near the surface of the sea, while the Molpadidae are probably in a state of 
emigration seawards, a great number of them having already reached the abysses and 
settled there. 
7. The Dendrochirotae and Aspidochirotae are still true shore or sballow-water forms, 
though there are even here many exceptions, proving that their representatives are 
thriving even at great depths. 
Concerning the geographical distribution, I refer the reader to the Geographical 
Tables, accompanied Ijy some general remarks, at the end of this Report. 
