84 THE VOYAGE OF H.M.S. CHALLENGER. 



When Gosse erected his genus Bunodes (Trans. Linn. Soc., vol. xxi. p. 274, 1855), 

 he included in it all Actiniae furnished with a knobbed surface. Later, he limited this 

 name to those Actiniae on the walls of which the papillae are arranged in regular, longi- 

 tudinal rows (Ann. and Mag. Nat. Hist., ser. iii. vol. i. p. 417, 1858). In both instances, 

 however, he laid it down as a rule that there should be no acontia, and the same definition 

 of the genus was accepted by Verrill (Trans. Connect. Acad., vol. i. p. 467), by Klunzinger 

 (Korrallthiere, i. p. 77), and by Jourdan (Annales des Scienc. Nat. Zool., ser. vi. t. x. p. 84, 

 1879-80). Gosse himself, however, changed his views afterwards, for, in his Actinologia 

 Britannica, he described Bunodes coronata as a form in which he had once observed acontia. 



Among the Challenger material I found one true representative of the Sagartidae, 

 the external appearance of which justified its being placed in the genus Bunodes. I have 

 determined it as Bunodes minuta, as I consider it quite possible that the acontia have 

 hitherto been overlooked in the species of the genus Bunodes. If this view be erroneous, 

 it would be necessary to erect a new genus for Bunodes minuta and Bunodes coronata. 



Bunodes minuta, n. sp. (PL II. fig. 12). 



Wall covered with alternate rows of larger and smaller papillae, which are confined to 

 the upper half of the body ; tentacles long and pointed, arranged in two circles, the outer 

 circle much smaller than the inner. 



Habitat.— Station 147. December 30, 1873. Lat. 46° 16' S., long. 48° 27' E. Depth, 

 1600 fathoms. One specimen. 



Dimensions. — Height and breadth, 1 cm. 



The general appearance of the small new species of Bunodes, which I shall describe 

 as Bunodes minuta from a single specimen found among the Challenger material, recall» 

 that of Paractis excavata At first sight the body seems as broad as high (fig. 12, a), 

 but if we cut open the animal (fig. 12, b) we see that the oral disk extends deep down 

 into the body, so that there is but a little distance between the pedal disk and the 

 periphery of the mouth. The diameter of the oral disk is therefore essentially greater 

 than the breadth of the body given above. 



The upper section of the wall is brownish, the lower part whitish and covered with 

 small papillae, which are arranged in from thirty to forty rows. Each row begins at the 

 upper margin of the wall, and reaches half-way down the animal ; the papillae are small 

 at first and increase in size downwards ; they comport themselves differently, however, 

 in the different rows, as rows with large papillae and rows with small papillae alternate 

 irregularly. The same conditions therefore recur in Bunodes minuta, which exist in 

 Bunodes coronata, a fact of special interest, as they are the only two species of Bunodes 

 in which acontia have as yet been found (Gosse, Actinologia Britannica, p. 204). 



Histologically, I find that the papillae are formed of connective substance only, and 

 have therefore come to an entirely different conclusion from Jourdan, who declares them 



