Tubulipora. Z. ASCIDIOIDA. 269 
i mentientem exhibuerunt,” Pallas. Orkney and Shetland islands, 
Jameson. 
Polypidom adherent by a narrow base, calcareous, of a faint pur- 
j pie colour or white, depressed, irregularly divided, the segments flat, 
( bifid, spreading, more or less revolute, obtuse, the under surface even 
and striate, the upper rough with the tubulous cells arranged in trans- 
j verse rows, but divided by a central groove, which winds along the 
! branches : the cells are generally placed in close apposition, some- 
times they are disjunct, and the walls are minutely frosted.-— -The 
entire polypidom rarely exceeds half an inch in length. 
Milne-Edwards is of opinion that the T. serpens of O. Fabricius 
is not synonymous with the Linnaean species, but with the T. fim» 
briata of Lamarck, in which opinion a re-perusal of the description, 
in the Fauna Groenlandica, does not induce me to coincide. Milne- 
Edwards refers our polypidom to the genus Aulopore. Ann. des Sc. 
Nat. Part. Zook viii. 331. 
3. T. truncata, “ stem round, branched, ending with enlarg- 
ed globular heads , radiated with plates of united vertical cells.’ 7 
Jameson. 
Tubulipora truncata, Flem. Br. Anim. 529.— Millepora truncata ? Ja - 
meson in Wern. Mem. i. 560. T. tronque, Blainv. Actinol. 425. 
Hab. " In deep water, Zetland,” Dr Fleming. Shetland Islands, 
Jameson. 
“ About an inch in height, the branches scarcely exceeding one- 
eighth ; the branches are short, pierced by numerous pores, the open- 
ings of cells converging towards the centre ; the head is stellate, the 
rays are highest in the middle of their course, diminishing towards 
the centre and lower margin of the head ; each ray is compressed, 
and consists of two rows of tubular cells, united, crowded, with sub- 
angular orifices ; the tubes have a central direction, and give to the 
sides of the plates a striated appearance. This species has probably 
been referred to as an inhabitant of the north seas, under the title 
of Millepora truncata,* but it differs widely from the Myriozoos of 
Donati, to which the term was restricted by Pallas.” Fleming. 
# * Crustaceous. (Obelia, Lamouroux.) 
4. T. Obelia, crustaceous, the cells in rows, tubular, with an 
oblique even rim. Miss Elliot. 
Plate xxxi. Fig. 7, 8. 
* Stew . Elem. ii. 426, pi. 12, fig. 7. 
