Figure 2.

Mytilus edulis embryonic and early larval development incubated at different pressure/temperature regimes for 50 hours, with fertilization occurring at atmospheric pressure. Histograms are of percentage mean and standard deviation. Stages of development: A=abnormal; 0=unfertilized; I=fertilized, uncleaved egg; II=two-cell; III=four-cell; IV=eight-cell; V=multi-cell; VI=early blastula; VII=gastrula; VIII=early trochophore; IX=late trochophore; X=D-larva (see table 1 for a detailed description of each developmental stage).