220 AMPHINOMINA. 



situated along the superior border of all the dorsal divisions of the feet, the first three 

 or four excepted, or behind the border, and extending to the ventral branch, resembling a 

 pinnatifid leaf (feuilles), with tufts or arbuscles, which generally divide at their origin 

 into several trunks, now coalescing, and again separating more or less distantly the one 

 from the other. Mouth with a short proboscis, opening longitudinally at the extremity, 

 without prominent folds or tentacles, and devoid of jaws. Eyes two or four ; antennae of 

 moderate length and generally complete. Sometimes the middle and exterior are 

 absent; the unpaired is always present and inserted at the front of the caruncle 

 superiorly, the latter extending to the third or fourth segment. Feet with large 

 separate divisions, each furnished with a single bundle of bristles and without a spine. 

 Cirri well marked, subulate, enlarged at the base, or in the form of two articulations, of 

 which the one, large and short, serves as a support for the other, which is completely 

 retractile. They are inserted within the orifice of the sheath, behind the bundle of 

 bristles. The anterior feet do not differ materially from the posterior. The feet of the 

 first and second segments exist in all the genera. 



Lamarck 1 (1818) followed Savigny in his classification of the group. 



OErsted 2 placed the family Amphinomacese in his division Maricolse, characterised 

 by having bristled pinnge, a depressed body, segments numerous and defined, and with 

 the alimentary canal often branched. They were finally distinguished as Chaotopoda 

 Trematodina, with branchiae completely ramose. He does not include any repre- 

 sentative, however, in his list. 



Kinberg 3 describes the Amphinomea as having the mouth inferior, formed by the 

 anterior segments ; pharynx protrusible, devoid of papillae and jaws ; cephalic lobe with 

 four eyes and a caruncle. The cirri and branchiae do not alternate. He divided the 

 group into two families — the Amphinomacea and the Euphrosynea. His first family, 

 the Amphinomacea, included Chloeia, Sars, Notopygos, Grube, Lirione, n., Amphinome, 

 Bruguiere, Hermodice, n., and Murythoe, n. The characters were — cephalic lobe rounded ; 

 no tentacle; two antennae; two antenniform palpi; branchiae on few segments ; dorsal and 

 ventral divisions of the foot distinct. The representatives of these genera are more 

 characteristic of the warmer seas, as shown by the earlier writers, as well as by Kinberg's 

 paper and the voyage of the " Challenger." Even the expedition of the " Porcupine," in 

 1870, brought fine specimens of Chloeia from the Mediterranean. The labours of Prof. 

 M. Sars, however, introduced in 1861 a northern example of the genus Eurythoe ; 4 and his 

 distinguished son, Prof. Gr. 0. Sars, added another representative of the family in 

 Par amphinome? which he had found amongst the unpublished manuscripts of his 

 father. 



In the catalogue of the Poyal College of Surgeons 6 an account of the circulation 

 and the branchial plexuses of Amphinome capillata is given. 



1 ' An. sans Vert./ vol. v, p. 327. 



2 ' Ann. Danic. Consp./ p. 4, 1843. 



3 •' Ofversigt af Kongl. Vet. Akad. Forhandl./ Aug. 14, No. 1, p. 11, 1857. 



4 ' Christ. Vidensk. Selsk. Forhandl./ 1861. 



5 l Some .Remarkable Forms, &c, off the Norwegian Coast/ Christ., 1872, p. 45. 



6 Vol. vi, p. 14. 



