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 costse (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 Besmophyllwn. Both have exsert septa, and they project 

 eccentrically also. The costse 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), 358 fathoms, yielded two small specimens, para- 

 sitic upon a mass of Amphihelia oculata, Linneeus. The smallest, not more than 

 -^ inch in height, has six large primary septa, six rudimentary secondary septa, and 

 traces of the tertiaries. A larger specimen, about -^ inch high, has four perfect cycles, 

 and resembles the full-grown Besmophyllum stokesi 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 Besmophyllum, which were more or less covered with serpulse ; they were 

 granular externally. 



The variety costatum is found in the Older Pliocene formations of Messina and Asti. 



Genus FL.tBELLUM, Lesson, 1831. 

 Flabellum DiSTiNCTUM, Milne-Edwards & Jules Haime, 1848, op. cit. (Plate XXXIX. 



figs. 1-13.) 

 Flabellum extensum, Michelin. 



Specimens of many different sizes and varieties of Flabellum distinctmn 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.' 



AU 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 costse, the 

 size of the peduncle, and in the increase and diminution of the lateral angles. It is 

 quite evident that Flabellum ewtensum 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. Flabellum 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 XXXIX. 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, 



