TRANSACTIONS 



OF 



THE LINNEAN SOCIETY. 



I. The Morphology of Cyclops and the Relations of the Copepoda. By Marcus M. 

 Hartog, D.Sc, H.A., F.L.S., Professor of Natural History, Queen's College, 

 Cork. 



Read 19th June, 1884. 



(Plates I.-IV.) 



Contents : — Introductory. Methods. Segmentation of Body and Appendages, and Voluntary Mus- 

 cular System. Histology of the Integument. Ccelom and its Connective and Muscular Tissues. Digestive 

 System (including Respiration and Circulation). Kidney. Nerv.. us System and Sense-organs. Repro- 

 ductive System. The position of the Copepoda in the Crustacean phylum. 



Introductory. 



I HIS paper was originally intended to convey only the new results I had obtained on 

 certain points in the anatomy of Cyclops ; but at the suggestion of my friend Prof. E. 

 Hay Lankester I undertook a full anatomical description. This occupies the greater 

 part of the following pages ; and histological details have throughout been sub- 

 ordinated to morphological observations. I have also subjoined a discussion on the 

 position of the Copepoda in the Crustacean phylum. 



Unfortunately my work has been carried on at a distance from great libraries, and 

 many works I should have wished to consult, especially those of Dana, Dohrn, Packard, 

 and Van Beneden, have been inaccessible to me. The chief memoirs referred to on 

 the subject will be found in the subjoined footnote* ; and among them those of Claus 



* Baird. The British Entomostraca. (Raj Soc.) 1S54. 



Brady, G. S. Monograph of British Copepoda. (Ray Soc.) 1878-80. 



Claus. Die freilebenden Copepoden, 1863 ; Crustaceen-Systems, 1876 ; " Das Genus Cyclops, u. s. einheinrische 

 Arten," Wiegm. Arch. 1857 ; " Weitere Mittheil. iib. d. einh. Cyclopiden,'" ibid. ; " Beitrage zur Anat. u. Entw. 

 d. Cyclopiden," Wiegm. Arch. 1858 : " Ueb. d. Blassen Kolben u. Cylinder a. d. Antennen d. Copepoden u. Ostra- 

 coden," Wiirzb. Zeitsch. 1S60: Bau u. Entw. v. Branchipus stagnate u. Apvs cancriformis, 1873; Bau u. Organi- 

 sation d. Polyphemiden, 1877. 



Giesbrecht. Die freilebenden Copepoden d. Kieler Fohrdre, 1SS2. 



Grtjber. " Beitr. z. Kenntn. d. Generationsorgane d. freilebenden Copepoden," Zeitschr. f. wiss. Zool. 1878. 



Grenacher. Sehorgan d. Arthropoden, 1878. 



Hartog. " Nervous System of Cyclops," Proc. Lit. & Phil. Soc. Manchester, 1S78 ; " Anal Respiration of the 

 Copepoda," ibid. 1879 ; " De l'CEil impair des Crustacea," Comptes Beudus & Arch, de Zool. Exp. 1882. 



Vernet. Observations Anatomiques et Physiologiques s. 1. genre Cyclops, 1871. 

 SECOND SERIES. — ZOOLOGY, VOL. V. 1 



