. Text-fig. 12. Didemnum trivolutum (St. WS 811): A, zooid; B, C, spicules. Zoom (Text-fig. 12 A). The thorax is about i-6 mm. long and the abdomen about i-o mm. The prominent oral siphon has six pointed lobes. A large part of the dorsal side of the thorax is exposed by the atrial opening which extends at least half the length of the thorax and often extends almost the whole length. On the anterior border the opening bears a short triangular languet («./.). There are large oval lateral thoracic organs with associated masses of small spicules. These organs occupy most of each side of the
. Text-fig. 12. Didemnum trivolutum (St. WS 811): A, zooid; B, C, spicules. Zoom (Text-fig. 12 A). The thorax is about i-6 mm. long and the abdomen about i-o mm. The prominent oral siphon has six pointed lobes. A large part of the dorsal side of the thorax is exposed by the atrial opening which extends at least half the length of the thorax and often extends almost the whole length. On the anterior border the opening bears a short triangular languet («./.). There are large oval lateral thoracic organs with associated masses of small spicules. These organs occupy most of each side of the thorax. Branchial sac. There are about eleven long narrow stigmata in each of the four rows. The three dorsal languets are long, curved, and directed anteriorly. 8-2
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Keywords: ., bookcentury1900, booksubjectocean, booksubjectscientificexpediti
