22 THE VOYAGE OF H.M.S. CHALLENGEK, 



1. Alecto, Lamouroux. 



. , Alecto, Lamx.,;1821 ; Blainville, Johnston, M.-Edw., Busk., Miclielui, Gray, Norman, Heller, &c. 



Tuhulipora (pars), Lamk., Smitt. 



Stomatopora, Bronn, d'Orb., Hincks (pars), ifec. 



Aulopora (pars), Goldfuss, Eeuss. 



Diastopora, (pars), Smitt. 

 1 Prohoscina (pars), Audouin, d'Orb., Smitt (subgenus). 



Character. — Zoarium closely adnate throughout ; simple or branched ; linear or 

 ligulate. Zocecia uniserial, or disposed in distant, more or less regular, transverse series 

 -of two to four. 



(l) Alecto granulata, Milne-Edwards. 



Alecto granulata, M.-Edw., E^ch. sur les Crisies, p. 13, pL xvi. fig. 3, 3a; Jobnston (pars), 



Busk, Brit. Mus. Cat., pt. iii. p. 24, pL xxxii fig. 1 ; Joliet. 

 1 Alecto parasitica, HeUer, Manzoni. 

 Stomatopora granulata, d'Orb., loc. cit., p. 836, pi. 628, figs. 5-8 ; Hincks, Brit. Mar. Polyz., 



p. 425, pi. ivii. figs. 1, 2. 



Character. — Zoarium linear, branched, the branches often anastomosing. Zocecia 

 ■uniserial, decumbent, with the oral extremities raised, subventricose below ; surface 

 granular or coarsely ringed. 



Habitat. — Off Inaccessible Island, Tristan da Cunha, 60 to 90 fathoms (on dead shell). 



[British and Irish coasts ; Norway and Sweden, Eoscoff, &c.] 



2. Tuhulipora, Busk. 



Tuhulipora, Bk., Engl. Cyclop., art. Polyzoa, col. xv.; Crag Polyzoa, p. 110; Lamouroux, 



Hagenow, &c., Bk., Brit. Mus. Cat., pt. iii. p. 24. 

 Tuhulipora (pars), Lamarck, Blainville, M. -Edwards, Johnston, Lonsdale, Michelin, Eeuss, 



d'Orbigny, Gray, Smitt (1867), Hincks, &c. 

 Ceriopora (pars), Hagenow. 

 Phalangella sp., Gray, Smitt (subgenus). 

 Prohoscina sp., d'Orbigny. 



Characters. — -Zoarium springing from a minute subglobular or discoid cell, and 

 expanding as it grows, into an irregularly lobate, or entire, reniform or faiji-shaped, adnate 

 growth, from which spring the elongated, cylindrical, tubular zocecia, free or partially 

 connate and ascending ; disposed _^more or less regularly in series diverging from a 

 mesial line or irregularly. 



