Holothuria tubulosa
Sea cucumber (a - Tentacles, b - Cloaca, c - Ambulacral feet on the ventral side, d - Papillae on the back)
Source Nordisk familjebok (1919), vol.28, p.282 http://runeberg.org/nfch/0159.html
Source: https://commons.wikimedia.org/wiki/File:Sjogurka_stor_ugglan.gif

The cotton-spinner or tubular sea cucumber (Holothuria tubulosa) is a species of sea cucumber in the family Holothuriidae. Holothuria tubulosa is found in temperate regions of the eastern Atlantic Ocean as far north as the Bay of Biscay and in the Mediterranean Sea, where it is abundant.

Order: Holothuriida
Family: Holothuriidae
Genus: Holothuria
Species: Holothuria tubulosa Gmelin, 1791
Synonyms

Holothuria cavolini delle Chiaje, 1824
Holothuria columnae delle Chiaje, 1823, non Cuvier, 1817
Holothuria columnae Cuvier, 1817
Holothuria columnae de Blainville, 1821
Holothuria maxima delle Chiaje, 1823
Holothuria petagnae delle Chiaje, 1824
Holothuria tremula Linnaeus, 1767