Discovery reports (1959) Discovery reports discoveryreports29inst Year: 1959 Text-fig. 19. Xenarcturus spinulosus , (a) Head and first pereion (second thoracic) somite, x 12. (b) Dorsal view of pleotelson. x 7. Text-fig. 20. Xenarcturus spinulosus , (a) Antennule, x 32. (6) Antenna, x 32. (c) Left mandible (dorsal view), x 50. {d) Right mandible (ventral view), x 50. (e) Right maxilliped (ventral view), x 50. (/) Left maxillula, x 60. (g) Left maxilla, X 60. each ends in a curved claw. The distal end of the merus of the last thoracic appendage has its inner angle produ
Discovery reports (1959) Discovery reports discoveryreports29inst Year: 1959 Text-fig. 19. Xenarcturus spinulosus , (a) Head and first pereion (second thoracic) somite, x 12. (b) Dorsal view of pleotelson. x 7. Text-fig. 20. Xenarcturus spinulosus , (a) Antennule, x 32. (6) Antenna, x 32. (c) Left mandible (dorsal view), x 50. {d) Right mandible (ventral view), x 50. (e) Right maxilliped (ventral view), x 50. (/) Left maxillula, x 60. (g) Left maxilla, X 60. each ends in a curved claw. The distal end of the merus of the last thoracic appendage has its inner angle produced to form a subacute projection. The surface of the joints is covered with scattered spinules similar to those covering the body surface. In the breeding female, brood lamellae are developed on each of the second to the fifth pairs of thoracic appendages inclusive. The first pleopod of the male (Text-fig. 22b) has the exopod modified as a copulatory organ; it is longer than the endopod and has its distal portion bent almost at right angles and drawn out into an acute point. Its outer concave margin bears a number of plumose setae; a similar modification is seen
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