Sentence Examples with the word Dorsum

It seems probable that it is identical with one of the open sacs in which each shell-plate of a Chiton is formed, and the series of plate-like imbrications which are placed behind the single shell-sac on the dorsum of the curious slug, Plectrophorus, suggest the possibility of the formation of a series of shellsacs on the back of that animal similar to those which we find in Chiton.

Respiration is effected by means of external gills placed along both sides of the dorsum of the abdomen and hinder segments of the thorax.

Both foreand hindwings are usually present, both pairs being membranous, the hindwings small and not folded when at rest, each provided along the costa with a row of curved hooks which catch on to a fold along the dorsum of the adjacent fore-wing during flight.

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On the dorsum of the penis the rim of the bell-shaped glans projects beyond the level of the corpora cavernosa, and is From C. S.