If you like to listen to sounds from your iPad (or any other Bluetooth enabled mobile device) on-the-go, the Urchin might quickly become one of your favorite accessories.
They are a flat and related to the sea urchin and have provided the inspiration for jewelry of many types, including earrings, for many years.
The Urchin is a heavy-duty Bluetooth speaker is designed for outdoor enthusiasts who like to enjoy tunes during their adventures.
The Urchin is also impact-resistant and dust-proof, which are great advantages for those who enjoy hiking and backpacking.
The sun will help to further bleach and deodorize your shells should any sea urchin be hiding in the shell.
Johns Hopkins I Sometimes called "Echinodermata," a Greek name meaning "sea-urchin-skins," which was invented by J.
Accepting the homology of these apical systems with the calycinal system, the theory would regard the aboral pole of a sea-urchin or starfish as corresponding in everything, except its relations to the sea-floor, with the aboral pole of a fixed echinoderm.
Neumayr adduced the Triassic sea-urchin Tiarechinus, in which the apical system forms half of the test, as an argument for the origin of Echinoidea from an ancestor in which the apical system was of great importance; but a genus appearing so late in time, in an isolated sea, under conditions that dwarfed the other echinoid dwellers therein, cannot seriously be thought to elucidate the origin of pre-Silurian Echinoidea, and the recent discovery of an intermediate form suggests that we have here nothing but degenerate descendants of a well-known Palaeozoic family (Lepidocentridae).
- Supposed calycinal systems of free-moving Echinoderms. A, regular sea-urchin (Cidaris); B, sea-urchin with a suranal plate (Salenia); C, developing ophiurid (Amphiura); D, young starfish (Zoroaster).
1 The EXevoSep,ua, or "urchin-skinned" animals, have long been a favourite subject of study with the collectors of sea-animals or of fossils, since the lime deposited in their skins forms hard tests or shells readily preserved in the cabinet.