20 THE VOYAGE OF H.M.S. CHALLENGEK. 



0"17 to 0'2 mm., wLich are disposed irregularly in circular whorls, about 1 mm. apart; 

 surface rough, punctate, even, with very faint indication of longitudinal striation. 

 Habitat. — OIF Marion Island, 50 to 75 fathoms. 



(3) Pustulopora deflexa, Smitt (sp.) (PI. IV. fig. 3). 



Entaloplwra deflexa, Smitt, Florid. Bryoz., vol. i. p. 11, pi. v. figs. 28-30; Waters, Ann. and 



Mag. Nat. Hist., ser. 5, vol. iii. p. 274. 

 Pustulipora deflexa, Johnst., p. 279, pi. xlviii. fig. 5; Norman, Eep. Brit. Assoc, 1868, p. 310; 



Marioii, Ann. d. Sci. Nat., sdr. 6, t. viii. p. 1 ; Joliet. 

 Pustulopora deflexa, Heller, Adriat., p. 125. 

 \ Tuhulipora deflexa. Couch, Corn. Fauna, vol. iii. p. 107, pi. xix. fig. 4. 

 ? Stomatopora deflexa, Hincks, Brit. Mar. Polyz., p. 437, pi. Ivii. fig. 4. 

 ^ Pustulopora clavata, Busk, Crag Polyzoa, p. 107, pi. xvii. fig. 1. 



Character. — Zoarium composed of very irregular furcate branches, 1 to 1"2 mm. in 

 diameter, constituted of very long cylindrical or very slightly terete ascending zocecia, 

 often crowded together in fasciculate bundles and varying greatly in length ; slightly 

 produced Orally, the produced portion curving slightly outwards ; surface granular or 

 uneven, sometimes 'transversely rugose, about 0"2 mm. in diameter. Ooecia *? 



Habitat, — Station 151, off Heard Island, 75 fathoms, volcanic mud. 



[South coasts of Britain ; Shetland, Norman ; Gulf of Florida, Smitt ; Bay of Naples, 

 Waters ; Adriatic, Heller ; Marseilles, Marion ; Roscoff, Joliet.] 



A peculiar feature of this species is the great disposition of the zocecia to be 

 collected into fasciculate bundles, somewhat in the same way apparently as they are 

 described by Mr. Hincks in his Stomatopora fasciculata, from which, 'however, it differs 

 in other more important particulars, such as the perfectly free and erect habit, and to 

 judge from Mr. Hincks's figure, the less diameter of the zocecial tubes, and their less entire 

 immersion or connation. In Stomatopora fasciculata, moreover, the zoarium is described 

 as having a dense and smooth surface and a dark brown colour. 



Mr. Couch's description of Tubulipora dejiexa is far too incomplete to aflford any 

 assistance towards its determination, and his figure is still less reliable. All he says is 

 that the zoariurb. is erect, cylindrical, with waved tubes projecting from all parts. Mr, 

 Hincks, however, states, with respect to his Stomatopora deflexa, that the " zoarium is 

 in great part adherent ; with linear branches expanding very slightly upwards, the 

 extremities free, erect, subclavate. The zooecia slender, disposed in pairs along the 

 creeping portion, and semialternate or alternate, the oral extremity free, bent upwards, 

 and projecting considerably." To this it may be added that Mr. Hincks rejects 

 Professor Smitt's Entalophora deflexa as a synonym of his Stomatopora deflexa. So 

 that on the whole it seems extremely doubtful what name should be assigned to the form 

 here described, with respect to which all that appears to me to be certain is that the 

 specimens (mere fragments) in the Challenger collection are identical with the form 



