384 Ven'ill, Notes on Radiata. 



are two or three cells. The lower fourth of the sheath is dilated to 

 about three times the thickness of the rest of the stem. 



Leug'th 19 inches; diameter of the naked stem '03 in.; smallest di- 

 ameter of stem, with the sheath, "04 in. ; diameter of expanded base 

 •13 in.; length of largest lobes "15 inch. 



Locality, Bay of Monterey, 20 fathoms. Collected by Dr. J. G. 

 Cooper, of the State Geological Survey. 



This species can be at once distinguished from V. elongata G. 

 (Proc. Cal. A. N. S., vol. ii, p. 167) by its more slender form, its pro- 

 portionally large polypiferous lobes, its cylindrical stem, without any 

 grooves, and the coxnparatively smaller portion of the stem bearing 

 the lobes." 



Stylatula elongata Ven-iii. 



Bulletin Museum Comp. ZoiJlogy, p. 30, 1864. 

 Virgularia elongata G-abb, Proc. Cal. Acad. Nat. Sci., ii, p. 167, 1863. 



This sp3cies is larger and stouter than the preceding. The pinme 

 are broader and more overlapping, leaving a naked space between the 

 lateral rows for only a short distance from the base. In the middle 

 twenty of the lateral wings, on each side, occupy an inch. The spines 

 are larger and less numerous. 



Near San Francisco, Cal. — A, Agassiz. 



Sub-Order, GORGONACEA. 

 Family, Goegonid^. 

 Gorgonia. 

 This genus, which formerly included the entire sub-order, has been 

 repeatedly restricted to narrower limits by successive authors, until 

 in the work of Milne Edwards and Haime* it is limited to those spe- 

 cies allied to G. verrucosa of the Mediterranean, Yet even they, as 

 it now appears, united with it some speciesf allied to Muricea., etc. 

 Dr. Albert Kolliker, who in a recent workj has very thoroughly in- 

 vestigated the microscopic structure of the Alcyonaria, reunites T^ath 

 Gorgonia several of the genera established by Milne Edwards, Valen- 

 ciennes, and others, viz : Rhipidogorgia, Pterogorgia, Xiphigorgia^ 

 Hymenogorgia, Phyllogorgia, Phycogorgia, Leptogorgia, Lophogor- 

 gia, and part of Gorgonella. As thus enlarged, the genus Gorgonla 

 of Kolliker includes all the Gorgonidse having a horny axis and thin 

 coenenchyma, with small and simple spicula. 



* Histoire naturelle des Coralliairei?, 185*7, vol. 1, p. 157. 

 f Muricea vatricosa KolL, Thesea exserfa D. & M., Echinogorgia aricla, etc. 

 if. Icones Histiologice, oder Atlas der vergleichonden Gewebelelire, ii, Leipzig, 1866, 

 4to, with XLS plates. 



