2 86 DASYBRANCHUS CADUCUS. 



subsequent investigation showed that its real affinities were with the Capitellidse. In the 

 same author's ' Familien der Anneliden ' (1851) he associated Gapitella with the Oligochseta 

 —placing it between Clitello and Nais, the type being Lumbricus capitatus, 0. Fabricius. 

 The extensive researches of Bisig have placed the genus on a modern footing. 



1. Dasybranchus caducus, Grube, 1846. Plate CI, figs. 4 and 4 a— head and branchial 

 segments; Plate OVII, figs. 15 and 15a— bristle and hook. 



Specific Characters. — Head relatively small, bluntly conical. Peristomial segment 

 as long as the following. On each side twenty minute eyes. Body 1 metre long and 

 breadth li cm.; segments about 120; buccal segment achaotous (Eisig). From fifteenth 

 segment hooks dorsally and ventrally. Alimentary canal reddish-orange. Proboscis 

 with tuberculated longitudinal ridges. Bristles from second to fourteenth segment. 

 Segments anteriorly two-ringed. Segmental organs yellow or brown. Blood-red in 

 front, yellowish-grey posteriorly, with red branchiee ; body externally dull brown, 

 reticulated anteriorly. Yellow eggs deposited from February to August. 



Synonyms. 



1846. Dasymallus caducus, Grube. Archiv f. Naturges., Bd. xii, p. 166, Taf. v, figs. 3 and 4. 

 1851. Dasybranchus caducus, idem. Fam. Amiel., p. 76. 



1864. „ „ idem. Insel Lussin, p. 86. 



„ „ „ Claparede. Glanures Zoot., p. 56, pi. viii, fig. 8. 



1865. „ „ De Quatrefages. Annel. ii, p. 258. 



1867. ? ,, cirratus, Grube. Eeise Novara, Annel., p. 28, pi. iii, fig. 4. 



1868. „ caducus, Claparede. Annel. Nap., p. 281, pi. xxvii, fig. 5. 

 1875. ,, „ Panceri. Atti Soc. Ital., vol. xviii, p. 526. 



1878. „ umbrinus, Grube. Annul. Semper., Mem. Acad. St. Petersb., xxv, p. 189. 



„ „ lumbricoides, idem. Ibid., p. 190, pi. x, fig. 4. 



1880. Notomastus roseus, Langerhans. Zeitschr. f. wiss. Zool., Bd. xxxiv, p. 99, Taf. iv, fig. 11. 

 1885. Dasybranchus caducus, Cams. Fauna Medit., p. 249. 



,, „ sp., Mcintosh. Annel. ( Challenger/ pp. 10 and 390. 



1887. ., caducus, Eisig. Monogr. Capitell., pp. 168, 823, pis. xvi — xxiii. 



„ Andrews. Proc. U.S. Nat. Mus., xiv, p. 293. 



„ Cuenot. Arch. Zool. exper., 2 e ser., ix, pp. 415, 425, pi. xvi, figs. 13 — 14. 



„ Lo Bianco. Atti Accad. Sc. Napoli., ser. 2, vol. v, no. 11, p. 15. 



„ Benham. Camb. Nat. Hist., vol. ii, p. 331. 



,, De St. Joseph. Ann. Sc. nat., 8 e ser.,, v, p. 387. 



„ Marenzeller. Denkschrift. Math. -Nat. CI. K. Akad. Wiss., Wien, Bd. 

 lxxiv, p. 21. 



„ Mcintosh. Marine Invert. S. Africa, vol. iii, p. 70. 



„ De St. Joseph. Ann. Sc. nat., 9 e ser., t. iii, p. 233. 



„ Mcintosh. Ann. Nat. Hist., ser. 8, vol. x ; p. 127, pi. v, figs. 6—9. 



Habitat. — Dredged in the ' Porcupine ' Expedition of 1870 at Station 8 on the 

 Channel slope, at a depth of 257 fathoms. 



It appears to be cosmopolitan in distribution. Mediterranean, Adriatic (Grube, 

 Panceri, etc.) ; Bay of Tunis (' Porcupine,' 1870), Atlantic, Madeira (Langerhans). Large 



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Dasymallus 



1893. 



Dasybranchus 



1896. 



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1898. 



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1902. 



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1904. 



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1906. 



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1912. 



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