VIBRIO. 



[ 807 ] 



VILLI. 



secondary deposits, applied end to end and 

 conHuent. The Latioiferous tubes are 

 sometimes called laticiforous or milk vessels. 



VIB'RIO, Miill.— A genus of Sckizoray- 

 cetes. 



Char. Filiform, more or less distinctly 

 jointed from imperfect division ; flexible, 

 movement undulatory, like that of a ser- 

 pent. 



Theso filamentous bodies are extremely 

 minute ; their simple structure is best seen 

 when thev are dried. 



V. rvgula (PI. 7. fig. 19). Filaments 

 hyaline, distinctly jointed, very tortuoiis 

 when in motion. Warming describes a 

 cilium. In decomposing infusions ; breadth 

 1-1 2000' •. 



V. haciUus (PI. 7. fig. 21). Filaments 

 elongate, hyaline, joints sometimes distinct 

 onlv after drying, flexuous in their slow 

 motiou; length 1-288" ; breadth 1-1700". 



Fig. 801. 



V. se7'pen8. Smaller than the last, with 

 tlu'ee or four undulations. In infusions &c. 



BiBL. Ehr. /??/. 77 ; Duj. Lif. 216; Ra- 

 bonlit. iii. 71. 



Vibrio /;7V/ri=ANOUiiiLULA tritici. 



VICTOREL'LA, Kent,— A genus of 

 Ctenostomatous Polyzoa. ('ells formed in 

 open enlargements of the creeping stem; 

 tentacles few ; no gizzard. 



V. pamla, YGvy minntQ; on Cordylophora 

 hicustris, in brackish water. 



BiBL. Kent, Qu. Mic. Jn. 1870, 31; 

 Hincks, Polijz. .559. 



VILLI. — These are minute folds or pro- 

 longations of the mucous membrane of the 

 small intestines. They are most numerous 

 in the jejunum and ileum — in the former, 

 conical and flattened, sometimes plate-like, 

 cylindi'ical, club-shaped or filiform, while 

 in the latter they are broader and flat- 

 tened. 



Fig. 802. 



Fig. 801. Intestinal villus of a kitten free from epitlieliimi, and after treatment with acetic acid: a, boundary of 



^a ,'o?A^;.- J*''!"*''""'^''' '"' nuclei ofthe muscular fibres; c/, roundish nuclei in the middle of the villus. Mae- 

 nifled 3o0 diameters. ^> 



Fig. 802. >1, magniflcd 75 diameters Two villi with their epithelium, from a rabbit: a, epithelium; 6, paren- 

 chyma. B ma^mUed .300 djameters. A row of detached epithelial cells: ff, membrane separated bv water. C. 

 magmflcd 3oO diameters. Detached epithelial cells : a with, h without the separated membrane ; e, surface view of 

 some epithelial cells. 



The villi form solid processes of the mu- 

 cous membrane, consisting of connective 

 tissue without elastic elements, but abound- 



ing in roundish nuclei; containing also 

 blood-vessels, lymphatics, and uustriated 

 muscular fibres.' 



