. Biology of the laboratory mouse. Mice as laboratory animals; Mice; Animals, Laboratory; Mice. PARASITES 365 tance in laboratory mice. Only those which occur commonly or have received special attention in the held of experimentation are described here. Syphacia obvelata (rudolphi, 1802).—Also known as Oxyiiris obvelata. The caecum of the laboratory mouse is commonly infected with this small oxyurid (Fig. 147) which may also occur in the colon. Upon special examination of the caecae of 34 experimental mice, J. M. Twort and C. C. Twort (39) found 17 infected with this species, while of the colo
. Biology of the laboratory mouse. Mice as laboratory animals; Mice; Animals, Laboratory; Mice. PARASITES 365 tance in laboratory mice. Only those which occur commonly or have received special attention in the held of experimentation are described here. Syphacia obvelata (rudolphi, 1802).—Also known as Oxyiiris obvelata. The caecum of the laboratory mouse is commonly infected with this small oxyurid (Fig. 147) which may also occur in the colon. Upon special examination of the caecae of 34 experimental mice, J. M. Twort and C. C. Twort (39) found 17 infected with this species, while of the colons of 57 of their animals 9 were found to be infected. Description of the genus, for which S. obvelata is the type species, is given by York and Maplestone (46) as follows: "]Mouth bounded by three lips; small cervical alae present; vestibule absent; oesophagus club-shaped with a posterior bulb con- taining a valvular apparatus and separated from the rest by a constriction. Male: with 2 or 3 cuticular ''mamelons" on the ventral surface; posterior extremity bent ventrally, body cut away ventrally behind the cloaca and then suddenly narrows and ends in a long pointed tail; narrow caudal alae present limited to the first part of the tail; two pairs of preanal papillae and one pair of postanal pedunculated papillae supporting the alae behind; spicule relatively long and very obvious; guber- naculum directed transversely. Female: tail long and pointed; vulva in the anterior region of the body, behind the excretory pore, and communicat- ing by a short vagina, frequently protruded, with a cuticle-lined ovejector remarkable for the thickness of its muscle coat; uterus single, very long; receptacula seminis parallel and narrow; two ovaries. ; Measurements given for S. obvelata are: male mm., female to mm., eggs 10 ^t to 142 jj. in length and 30 /j. to 40 jjl in breadth. Not much inflammatory reaction is caused by this parasite unless it occurs in l
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