ZOOLOGY OP FERNANDO NOEONHA. 569 



Remarks. 



Of the present collection, it may be stated that the facies is 

 West-Indiau. Chondrilla phyllodes, Sdt., has as yet only been 

 chronicled by that author, and that, too, from the " Antilles " 

 (Grnndzlige Spong.-F. atlautisch. GTebietes, p. 26). " Poly- 

 therses " was the name given by Duchassaing and Michelotti 

 to this transformed, sponge-like body which they dredged in the 

 Caribbean Sea, and whose constituent parts have been above 

 noticed. Both sorts of the Officinal Sponge, viz. the " Best 

 Turkey " and the " Honeycomb " of Commerce, are plentiful, as 

 they are in the West Indies generally. The Calcisponge, 

 Leuconia sacculata, is a new species. 



MADREPORARIA. 



By Prof. P. Martin Duncan, M.B. (Lond.), F.K.S., &c. 



Section MADEBPORARIA APOROSA. 

 Family A s t a iE i d iE, Ud. Sf H. 

 Subfamily Astejjid^ reptantes. 



AsTRANGiA SOLITARIA, Lesueur, sp., Verrill, Bull. Mus. Com}). 

 Zool. No. 3 ; Fourtales, 1871, 111. Cat. Mus. Com]). Zool. p. 79. 



A specimen much covered with Nullipores. The corallites 

 smaller than the Florida types, and the so-called " pali " not 

 united before the second and third cycles of septa. The form is 

 allied to Astrangia Danoe and to A. Michelini. It may be con- 

 sidered as a small variety of the Floridan species. 



Subfamily Aste^id^ c^spitos^. 

 MussA, sj). — A worn specimen of a species. 



Subfamily Astr^id^ agglomerate fissiparantes. 



Fa VIA CONFERTA, Verrill, 1867, Irans. Connect. Acad. vol. i., 

 in Sartfs Collection of Corals from the Abrolhos Reef Brazil, 

 p. 355 (1868). 



This species is I'emarkable for its elongated calices due to 

 fissiparity, and for their closeness. Often a ridge separates the 



LINN. JOURN. — ZOOLOGY, VOL. XX, 43 



