THE C1RRIPEDIA 141 



ORDER 5. Rhizocephala. 



Mantle present No appendages nor alimentary canal. A system 

 of absorptive roots nearly always present. 



Families not defined. Probably several should be recognised. Pelto- 

 gaster, Rathke ; Sacculina, Thompson (Fig. 80) ; Sylon, Kroyer ; Clistosac- 

 cus, Lilljeborg ; Lernaeodiscus, F. Miiller ; Trianguliu, Smith ; Duplorbis, 

 Smith ; Thompsonia, Kossmann. 



LITERATURE. 



1. Aurivillius, C. W. 6'. Ueber einige ober-silurische Cirripedien aus Got- 



land. Bih. Svenska Vet. Akad. Handl. xviii. Afd. iv. No. 3, 24 pp. 1 pi., 

 1892. 



2. Studien iiber Cirripedien. K. Svenska Vet. Akad. Handl. (n.f.) xxvii. 



(7), 107 pp. 9 pis., 1895. 



3. Bcrndt, W. Zur Biologic und Anatomic von Alcippe lampas. Zeitschr. 



wiss. Zool. Ixxiv. pp. 396-457, pis. xix.-xxil, 1903. 



4. Studien an bohrenden Cirripedien (Ordnung Acrothoracica, Gruvel r 



Abdominalia, Darwin). Arch. f. Biontologie, i. (2) pp. 165-210, pis. xiv.- 

 xvii., 1906. 



5. Claus, C. Die Cypris-ahnliche Larve (Puppe) der Cirripedien. . . . Schr. 



Ges. Naturw. Marburg, Suppl. Heft v. 17 pp. 2 pis., 1869. 



6. Darwin, C. A Monograph of the Sub-Class Cirripedia, 2 vols. 8vo. Ray 



Soc. London, 1851-1854. 



7. A Monograph of the Fossil Lepadidae . . . 1851. A Monograph of 



the Fossil Balanidae and Verrucidae, 1854. Palaeontographical Soc. 



8. Delage, Y. Evolution de la Sacculiue. Arch. Zool. exper. (2), ii. pp. 417- 



736, pis. xxii.-xxx., 1884. 



9. Fowler, G. H. A Remarkable Crustacean Parasite [Peirarca]. Quart. J. 



Micr. Sci. (n.s.) xxx. pp. 107-120, pi. viii., 1889. 



10. Groom, T. T. On.the Early Development of Cirripedia. Phil. Trans, clxxxv. 



pp. 119-232, pis. xiv.-xxviii., 1895. 



11. On the Mouth-Parts of the Cypris-Stage of Balanus. Quart J. Micr. 



Sci. (n.s.) xxxvii. pp. 269-276, pi. xxix., 1895. 



12. Gnivel, A. Monographic des Cirrhipedes ou Thecostraces. 8vo. Paris r 



1905 [1904]. 



13. Haiiscn, H. J. Die Cladoceren und Cirripedien der Plankton-Expedition. 



Ergeb. Plankton- Exp. ii. 58 pp. 4 pis., 1899. 



14. Hock, P. P. C. Report on the Cirripedia. Rep. Voy. "Challenger," Zool. 



viii. 169 pp. 13 pis., 1883 ; and x. 47 pp. 6 pis., 1884. 



15. Krohn, Aug. Beob. ii. d. Cementapparat u. d. weiblicheu Zengungsorgane 



einiger Cirripedien. Arch. f. Naturgesch. xxv. pp. 355-364, 1859. 



16. Lacaze-Duthicrs, H. dc. Histoire de la Laura Gerardiac. Mem. Acad. Sci. 



France, xlii. (2), 160 pp. 8 pis., 1883. 



17. Lilljeborg, W. Liriope et Peltogaster, H. Rathke. Nova Acta Soc. Sci. 



Upsaleusis, (3), iii. pp. 1-35, pis. i.-iii., and pp. 73-102, pis. vi.-ix., 1859- 

 1860. 



18. Miiller, Fr. Die Rhizocephalen, eine neue Gruppe schniarotzender Krebse. 



Arch. Naturgesch. xxviii. pp. 1-9, pi. L, 1862. 



19. Die zweite Entwickelungsstufe der Wurzelkrebse. Arch. Naturgesch. 



xxix. pp. 24-33, pi. iii., 1863. 



