. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 110 Mr. W. E. Collinge on an Abnormality XVII.—Note on an Interesting Abnormality in the Mandibular Arch of Chimsera monstrosa, L. By Walter E. COLLINGE, , , &c, Research Fellow of the University of St. Andrews, The Gatty Marine Laboratory, St. Andrews. ?Some little time ago, whilst examining- the visceral arches in a specimen of Ohimcera monslrosa, I met with an interesting abnormality in the form of a small bony substance situated immediately posterior to the m
. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 110 Mr. W. E. Collinge on an Abnormality XVII.—Note on an Interesting Abnormality in the Mandibular Arch of Chimsera monstrosa, L. By Walter E. COLLINGE, , , &c, Research Fellow of the University of St. Andrews, The Gatty Marine Laboratory, St. Andrews. ?Some little time ago, whilst examining- the visceral arches in a specimen of Ohimcera monslrosa, I met with an interesting abnormality in the form of a small bony substance situated immediately posterior to the mandibular symphysis. More recently, in examining further examples of this Cliimseroicl, I had the good fortune to meet with a further but somewhat similar abnormality. Having failed to find any mention of a like occurrence in any of the accounts of the cranial anatomy of this fish, a note upon the same may not be without interest. In the first specimen the abnormality consists of the presence of a small plate-like bone, not unlike in general Fio-. Outline figure of the mandible of C'hinuera monstrosa, showing the position of the abnormal bone. , abnormal bone ; , grinding-plate ; La., points of attachment of ligaments; m., mandible. shape the urohyal of some Teleostei. It is situated imme- diately behind the lower posterior border of the mandibular symphysis, being attached to each ramus by a short strong ligament (tig. 2, lig.), which latter is inserted at the two points marked in tig. 1. The bone is about 5 mm. long, and readily stained with a special stain for osseous tissues. Looked at from the ventral side, it is seen to consist of an anterior triangular plate with a somewhat longer tail-like portion posteriorly (fig. 2), the whole being confluent with a dorsal expanded plate. In transverse section through the anterior portion (fig. 2 a) the bone has the shape of a collar- stud (tig. 3 a), whilst a section through the posterior part. Please note that th
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