322 PROFESSOR P. M. DUNCAN ON THE 
One specimen is attached partly to a broken specimen of a dwarfed variety with a 
small calice and without any costz (No. 16 dredging). 
A finely pedunculate form, with a wide base of attachment, is fixed on to the wall of 
a portion of a gigantic Desmophyllum. Both have exsert septa, and they project 
eccentrically also. The coste of the perfect specimen are well developed; but the septa 
are thin, and the granular ornamentation is slight. ‘The specimen came from a much 
shallower part of the sea than those of No. 16 dredging. 
No. 6 dredging (second expedition), 558 fathoms, yielded two small specimens, para- 
sitic upon a mass of Amphihelia oculata, Linneus. The smallest, not more than 
js inch in height, has six large primary septa, six rudimentary secondary septa, and 
traces of the tertiaries. A larger specimen, about 745 inch high, has four perfect cycles, 
and resembles the full-grown Desmophyllum stokest of Torquay, which is probably an 
immature form. The septa are feebly exsert. 
No. 17 dredging, 1095 fathoms, second expedition, presented two specimens of 
varieties of Desmophyllum, which were more or less covered with serpule; they were 
granular externally. 
The variety costatum is found in the Older Pliocene formations of Messina and Asti. 
Genus FLABELLUM, Lesson, 1831. 
FLABELLUM DistINcTUM, Milne-Edwards & Jules Haime, 1848, op. cit. (Plate XX XIX. 
figs. 1-13.) 
Flabellum extensum, Michelin. 
Specimens of many different sizes and varieties of Flabellum distinctum were dredged up 
in No. 16 dredging (994 fathoms), No. 26 dredging (364 fathoms), and No. 28 dredging 
(304 fathoms) of the second expedition of the ‘ Porcupine.’ 
All have the peculiar and specific septal arrangement of the type described by 
MM. Milne-Edwards and Jules Haime; but there is great variation in the markings 
of the epitheca, the size of the lateral crests, the development of the other coste, the 
size of the peduncle, and in the increase and diminution of the lateral angles. It is 
quite evident that Flabellum eatensum must be absorbed; and it would have precedence 
were it a better species. 
Flabellum distinctum is a Japanese form; and I have specimens of it in a fossil 
condition from the Tejares of Malaga, which are Miocene strata. abellum extensum 
has been found in the Turin Miocene, and in either Miocene or Pliocene strata at 
Villeneuve-lez-Avignon, and in deposits of unknown tertiary age at Antwerp. 
FLABELLUM LACINIATUM, Ed. & H. (Plate XX XIX. figs. 14-18.) 
Syn. Phyllodes laciniatum, A. Philippi. 
Ulocyathus arcticus, Sars. 
This Flabellum has a remarkably delicate wall, and a few well-developed thin septa 
alternating with others which are much smaller. The soft parts are excessively thick, 
