BRYOZOA 63 



In the British Muséum spécimens the size of the avicularium is very variable, sometimes 

 being nearly rounded, at others long and spatulate. It may be necessary to call some of 

 the forms varieties. The Antarctic forms resemble S. reticulata MacG. in many respects, 

 but differ in having the surface perforated, and seem to be closely allied to S. oratavcnsis 

 Busk, and may be related to S. antarctica nov. On a stone from 619 (with Heteropora 

 claviformis nov.) there are two colonies, one of which has quite small avicularia, whereas the 

 other has much longer ones, though of the same shape, extending about one third of the 

 length of the zoœcium. 



Manzoni gives it as fossil from Castrocaro, but this must be looked upon as doubtful. 



Habitat. — Prince Edward Island 80-1 5o fathoms (130-240 mètres) ; Kerguelen Island 

 28 fath. (45 mètres), Challenger ; Victoria (MacG.). 



Exp. Antarct. Belge. 



N os 619, 683, Tangles VIII. Lat. 70 00' S.- Long. So° 48' W. ; 5oo ? met. ; +0.9 C. 



Smittia Landsborovii loi m personata Hincks 



Smittia Landsborovii Johnst, form personata Hincks, Ann. Mag. Nat. Hist., ser. S, vol. XIV, p 283, pi. IX, fig. 3 ; 



Waters, op. cit., ser. S, vol. XX,, p. ig5, pi. VI, fig. 23. 

 Smittia Landsborovii Johnst, var. purpurca Hincks, op. cit., vol. VIII, p. 64. 

 Smittia Jacobcnsis Busk, Zool. Chall. Exp.. vol. X, pt. XXX, p. iS3, pi. XIX, fig. 7. 

 Smittia monacha Julliex, Mission du Cap Horn, p. 52, pi. II, figs. r-3. 



In spécimens from i3g and 140 the « bridge » is very distinct, and the same thing 

 occurs in Smittia monacha]. in spécimens sent to me by Julliex, as well as in other material 

 from Cape Horn and there is no doubt that the Cape Horn 5. monacha is the var. personata 

 of Hincks. At one time I thought this was the same as S. oculata MacG., but although 

 they are very closely allied, it would be better to separate them, either as species or varieties. 

 The S. oculata has rather larger surface pores and the avicularium is oval, rather than round. 

 The peristome shows the same frontal élévation, though not to the same degree as in personata, 

 and the ovicells of S. oculata may hâve several large pores, while in spécimens sent to me 

 by Julliex, as monacha, there are sometimes only two pores, but as a rule there are several. 

 In both there are calcareous neiges above the pores, and the gênerai characters of the two 

 species are very similar. 



We may consider it an open question, whether the forms perforated ail over the 

 surface should not be considered as specifkally distinct from those with large pores round 

 the border. Hincks however considers this, and the form porifera, as merely varieties. 

 Possibly it would hâve been more correct to hâve made varieties of porifera, rather than 

 of Landsborovii. The bridge as a rule only occurs to ovicelligerous zoœcia. 



Habitat. — Bass's Straits (H.), Victoria (H.), Cape Verde Islands 100-200 fath., 

 Marion Islands 5o-75 fath. (B.), New South Wales (W.), Cape Horn (Jull. & W.). 



Exp. Antarct. Belge. 



Porto Torro, Ile Navarin, Magellanes, Chili. Jan. 3 rJ , 1898. 139 & 140. « Sur une 

 souche de Macrocystis py ri fera ». 



