VIBRIO. 



[ 807 ] 



VILLI. 



secondary deposits, applied end to end and 

 confluent. The LATICIFEROUS tubes are 

 sometimes called laticiferous or milk vessels. 



VIB'RIO, Mull. A genus of Schizomy- 

 cetee, 



Char. Filiform, more or less distinctly 

 jointed from imperfect division ; flexible, 

 movement undulatory, like that of a ser- 

 pent. 



These filamentous bodies are extremely 

 minute ; their simple structure is best seen 

 when they are dried. 



V. rugtda (PI. 7. fig. 1&). Filaments 

 hyaline, - distinctly jointed, very tortuous 

 when in motion. Warming describes a 

 cilium. In decomposing infusions j breadth 

 1-12000". 



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

 elongate, hyaline, joints sometimes distinct 

 only after drying, flexuous in their slow 

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



Fig. 801. 



V. serpens. Smaller than the last, with 

 three or four undulations. In infusions &c. 



BIBL. Ehr. Inf. 77 ; Duj. Inf. 216 ; Ra- 

 benht. iii. 71. 



Vibrio tritici= ANGUILLULA tritici. 



VICTOREL'LA, Kent. A genus of 

 Ctenostomatous Polyzoa. Cells formed in 

 open enlargements of the creeping stem ; 

 tentacles few ; no gizzard. 



V. pavida, very minute ; on Cordylophora 

 lacustris, in brackish water. 



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

 Hincks, Polyz. 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, 

 cylindrical, 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 epithelium, and after treatment with acetic acid : a, boundary of 

 Sited ? 350 diameters "'' *' muscular fibres; d, roundish nuclei in the middle of the rillus. l&g- 



Fig. 802. A, magnified 75 diameters. Two villi with their epithelium, from a rabbit: a, epithelium; 6, paren- 

 chyma B, magnified 300 diameters. A row of detached epithelial cells: a, membrane separated by water ?*, 

 sm?e i?h 1? f T Detached e P lth <^ cells : a with, 6 without the separated membrane ; c, surface view o 



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 unstriated 

 muscular fibres. 



