. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. 276 DISCOVERY REPORTS. The proboscis is stout. I could not make out more than nine nerves in one of my series of sections, but there were ten in another. The arma- ture consists of a main stylet with two reservoirs each with three stylets. The brain is large, the dorsal ganglia being somewhat smaller than the ventral. There is no dorsal strand in the lateral nerves. The cerebral organs are small. They open laterally and only just reach the brain (Fig. 51). Two small specimens from St. 42 were ex
. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. 276 DISCOVERY REPORTS. The proboscis is stout. I could not make out more than nine nerves in one of my series of sections, but there were ten in another. The arma- ture consists of a main stylet with two reservoirs each with three stylets. The brain is large, the dorsal ganglia being somewhat smaller than the ventral. There is no dorsal strand in the lateral nerves. The cerebral organs are small. They open laterally and only just reach the brain (Fig. 51). Two small specimens from St. 42 were examined among the preserved material. One was sectioned and proved to be a female with large eggs. In all characters this specimen agreed with the above description. Tetrastemma maivikenensis, (Plate XVI, fig. 10). Only the external characters of a single specimen (N 19) of this worm are known, and it bears a resemblance (except in size) to T. vermiculus, Quatrefages. The length in life was 40 mm., the breadth 075 mm. The body was soft and round, tapering to the tail. There were two pairs of eyes and the brain could be seen as a bilobed pinkish mass through the body wall. The colour was pale green except at the head which was yellowish. The distinctive marking Fig. 51. Tetrastemma hngistria- consisted of a streak of brown pigment between the eyes of *». n-sP- GraPhic ^construe- tion of the head and section each Side. across the body to show the It takes its name from Maiviken, South Georgia, where extreme development of the the specimen was found (St. MS 70). epithelium. Tetrastemma stanleyi, (Plate XVI, fig. 12). Three specimens of this form were collected in Port Stanley harbour under stones at low tide on April 29, 1926 (N 21). The lengths ranged about 40-0 mm., the breadths 1-2 mm. The body is round in section, the head slightly constricted from it, bluntly pointed and somewhat flattened. The tail tapers but ends acutely. There are from one to four eyespots in e
Size: 1036px × 2411px
Photo credit: © Paul Fearn / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, booksubjectocean, booksubjectscientificexpediti
