Each egg case
was weighed in the lab, placed in a quart mason jar with gauze-covered lid, kept at 20 C, and examined each day to test the hypothesis that south-facing egg cases
hatch earlier, because of solar heating, than those oriented in other compass directions.
Only one egg capsule per oviduct has been documented for both species, and it is assumed that there is a single embryo per egg case
as there are only rare exceptions to this (big skate Beringraja binoculata (Girard, 1855) and mottled skate Raja pukhra Liu, 1932 which have up to four embryos per egg case
(Ebert & Winton 2010)).
The machine was used to construct 30-dozen egg cases
consisting of two 15-dozen compartments side by side.
An egg case
that was constructed on 1 November hatched 57 days later, on 28 December, so I expected the egg case
constructed on 14 November to hatch on 11 January, but this didn't happen.
When the glue is dry, use a calligraphy pen to write text around the edge of the egg case
in concentric rings.
In oviparous chondrichthyes, the presence of fibrils or "hairs" in the egg case
is common, which secures its fixation to substrate.
The egg case
from a praying mantis is straw-colored and looks like a piece of shredded wheat breakfast cereal about the size of a child's thumb.
We glued egg case
bundles to clear plastic panels (Plexiglas) to replicate egg masses on murex shells.
Omega-3 claims are all over the egg case
, from brands like Land O Lakes to Best, Gold Circle Farms, Full Spectrum Farms, Giving Nature, Safeway, and more.
ANSWERS: 1 Madrid; 2 Cones of extinct volcanos; 3 Hummus; 4 Copenhagen; 5 A docile horse with a steady gait favoured by ladies; 6 Newmarket; 7 The krona; 8 Raymond Chandler; 9 Beatrix Potter; 10 The empty egg case
of a dogfish.
The egg appeared coppery brown in colour and a portion of gnathosoma, eye spots and legs of the larvae could be easily perceived through the egg case
few hours prior to hatching (Manjunatha and Puttaswamy, 1989).
Another is to find a local source for fresh eggs, or even to get a few chickens of your own and declare your independence from the supermarket egg case