The basal margin on the carinal side of the spur is sometimes a little hollowed out.
Scuta.The scuta and carinal half of the terga are blueish-green.
The lines of growth are upturned along the carinal margin, which consequently is a little protuberant, but to a varying degree.
The carinal half of the basal margin generally forms an angle with the spur of only a little above a rectangle.
The crests for the carinal depressor muscle are barely developed.
The carinal margin of the valve is just perceptibly bowed, and is formed by rectangularly upturned lines of growth.
Tergum with the carinal half of the basal margin sometimes much hollowed out.
Terga with the spur bluntly pointed; nearly the whole basal margin, on the carinal side, slopes towards the spur.
The occludent margin is curved, and blends by a regular sweep into the carinal margin, so that there is no acute upper angle.
The carinal margins of the compartments project a little inwards.
carina ca·ri·na (kə-rī'nə, -rē'-)
n. pl. ca·ri·nae (-nē)
A keel-shaped ridge or structure, such as the ridge on the under surface of the fornix of the brain.