6+ 



EXPEDITION ANTARCTIQUE BELGE 



N° 683, Swab. VIII. Lat. 70" 00' S.- Long. 8o° 48' W. ; 5oo met.; -f 0.9 C. 

 The few zoœcia are without ovicells or avicularia. 



Smittia crozetensis nom. nov. 



PL VIII, fig. iSa, h 



Mucronella ventricosa var. multispinata Bcsk, Zool. Challenger. Exp., vol. X, pt. XXX. p. 160, pi. XXII, 

 fig. 11. 



I have shown in a paper on the Madeira Bryozoa ('), that the Lepralia multispinata 

 Busk, from Madeira, is not the same as the var. multispinata of the Challenger Expédition, 

 and I am still not at ail sure that this is not Mucronella Peachii var. octodentata of Hincks, 

 although spécimens from the Mediterranean are very much smaller ; but Hincks ( 2 ) considered 

 that they should be separated. The main différence however seems to be that while Hincks 

 described octodentata as smooth, this is distinctly granular. For the présent, the fact that the 

 Antarctic and Kerguelen Island species are the same is indicated by giving a new name, 

 which however may not be permanent. 



The lyrula (denticle) is bifid, or may support projections in various planes. The ovicell is 

 very small and thrown back. 



A spécimen from 683 has the zoœcia about twice as large as those of S. ventricosa, 

 whereas one from 5g6 has smaller ones than 683, though still materially larger than those 

 of British S. ventricosa. There are somewhat larger zoœcia in spécimens from 288 and 570 

 (fig. i5o) and the}' also have a double row of small pores round the border ; also in a spécimen 

 sent to me by Canon Norman, as a variety of ventricosa, there are two rows of pores round 

 the border and six oral spines. In thèse spécimens from 288 and 570 the aperture is directed 

 forwards with a thick border, and the surface is granular. 



The ventricosa-Pcachii group are very widely distributed and it is an open question, 

 whether too many species have not been made. The group is represented fossil in the Tertiaries 

 under various naines, among others Lepralia Grotriana Reuss, and Lepralia Hornesi Reuss ; and 

 at présent is widely distributed as .1/. Peachii Johnst., M. ventricosa Hass., M. teres Hincks, &c. 



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

 210 fathoms (3qo mètres). 



Exp. Antarct. Belge. 



N os 277, 288, Dredge I. Lat. 71° 09' S.- Long. 89° i5' W. ; 460 met. ; 4-0. 3 C. 



N° 32o, Tangles IL Lat. 71 14' S.- Long. 89 14' W. ; 460 met. ; +o.3 C. 



N° 428, Tangles VI. Lat. 71 19' S.- Long. 87" 37' W. ; 436 met. ; — 0.2 C. 



N os 570, 5g6, Tangles VIL Lat. 70 23' S.- Long. 82 47' W. ; 480 met. ; +0.8 C. 



X" s 619, 683, Tangles VIII. Lat. 70-00' S.- Long. 80048' W. ; 5oo ? met. ; +0.9 C. 



N° 820, Tangles X. Lat. 70° i5' S.- Long. 84°o6' W. ; 56g met. ; +0.8 C. 



(1) Bryozoa from Madeira. (Journ. Rov. Micr. Soc, 1899, p. 9.) 



(2) Ami. Mag. Nat. Hist., ser. 6, vol. IX, p. 327. 



