. Fig. 45. S. vigilax. a, Elaphocaris i; b, Elaphocaris 2; c, Elaphocaris 3. Acanthosoma i (Fig. 46 a). Length 2-35 mm. Rostrum o-6 mm. Rostrum longer than antennules, with large basal spine. Supraorbital spines longer than eyes; hepatic spine rather large. Two pairs of lateral spines, of which the second is small and the first reaches about to end of eyes. Posterior dorsal spine small. Dorsal organ absent. Abdominal somites i and 2 with small median ventral spines; lateral spines short, with small spinules, and a rather large backwardly directed basal spine, lateral spines

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