"Teredina " shells consist of 2 short, hooked valves with a pair of furrows and each valve with transverse ridges.
32.
The cusps are connected to cusps in the other row by transverse ridges and separated from cusps in their own rows by three transverse furrows.
33.
The plical and second discal are represented by white transverse ridge-tufts, the latter followed by a round pale greyish-ochreous cloud.
34.
There are a number of fuscous dots on the costa and there is a transverse ridge of elevated scales from the dorsum nearly to the costa.
35.
Near its posterior margin may be seen a more or less marked transverse ridge for the attachment of part of the aponeurosis of the Tensor veli palatini.
36.
The tethytheres are united by several characters, including anteriorly facing orbits and more or less bilophodont cheek teeth ( double transverse ridges on the crowns of the teeth ).
37.
The dental formula for " Diatomys " is 1 / 1 cheek teeth are bilophodont, displaying two transverse ridges that are each slightly curved into a mild horseshoe shape.
38.
The shell of " Arcestes " is globular or subglobular with periodic narrow transverse constrictions in internal molds due to periodic internal transverse ridges ( variaces ) in the shell.
39.
Between the Val d'Entremont and the Val de Bagnes are two high ridges, nearly parallel to each other and to those valleys, which both diverge from a short transverse ridge of great height.
40.
Thumping may be less damaging to the environment than firing explosives in shot-holes, though a heavily thumped seismic line with transverse ridges every few meters might create long-lasting disturbance of the soil.
