LIMULUS AN ARACHNID, 505 
It is not desirable at the outset to follow the history of 
the discussion relative to the zoological position of Limulus. 
Those who desire to become acquainted with the most im- 
portant contributions to the subject should consult the 
memoirs of Anton Dohrn and A.S8. Packard, who have given 
very ample references to the literature of the subject. 
I shall here give in alphabetical order a list of the chief 
works referred to in the following pages, the number at- 
tached to an author’s name when cited, having reference to 
the number in the present list. After I have put forward 
the facts and inferences with reference to the structure and 
affinities of Limulus which appear to me to be well-estab- 
lished, I shall briefly review the various opinions which 
have been advanced by recent writers of authority. 
— 
Special Memoirs. 
. Dourn, Anton. “ Bau und Entwickelung der Arthropoden,” ‘ Jen- 
, aische Zeitschrift,’ Bd. vi, 1871. 
. Gecenzaur, Carl. “ Anatomische Untersuchung eines Limulus,” 
, ‘ Abhandlungen der naturforschenden Gesellschaft in Halle,’ 1858. 
. GkenacHer. “ Unters. uber das Sehorgan der Arthropoden,” 1879. 
. Lanxuster, E. Ray.‘ Mobility of the Spermatozoa of Limulus,” 
‘Quart. Journ. of Mier. Science,’ 1878. 
. Mitwz-Epwarps, Alphonse. ‘Recherches sur |’Anatomie des 
IAmules,” ‘ Annales des Sciences Naturelles,’ 5th series, Zoologie, 
ol. xvii, 1873. 
: Naywrorr, George. ‘‘ Nervous and Circulatory Systems in Myria- 
y poda and Macrourous Arachnida,” ‘ Philos. Transactions of the 
_* Royal Society,’ part 11, 1843. 
_“"7, Owen, Richard. “Anatomy of the King Crab,” ‘Transactions of 
8 
9 
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for) 
the Linnzan Society of London,’ 18738. 
. Pacxarn, A.S., Junr. “The Development of Limulus polyphemus,” 
‘Memoirs of the Boston Society of Natural History,’ 1872. 
. Pacxarp, A.S,Junr. “'‘The Anatomy, Histology, and Embryo- 
logy of Limulus polyphemus,” ‘Anniversary Memoirs of the 
Boston Society of Natural History, 1880. 
10. Van Benepen, Edouard. “De la place qui les Limules doivent 
occuper dans la classification des Arthropodes,” Société Entomo- 
logique de Belgique, October, 1871 (translated in the ‘ Annals 
and Mag. of Natural History,’ 1872). 
11. Van per Horven. ‘Recherches sur )Histoire Naturelle et 
P Anatomie des Limules,’ Leyden, 1838. 
12. Watcot, C.D. “The Trilobite,” ‘ Bulletin of the Museum of 
Comparative Zoology at Harvard College,’ vol. vii, April, 1881. 
13. Woopwarp, Henry. “ A Monograph-of the British Fossil Mero- 
stomata,” ‘ Paleontographical Society of London,’ 1866—1878. 
Text-books of Zoology. 
14, Ciavs, Carl. ‘ Grundziige der Zoologie,’ fourth edition, first volume, 
third part, p. 638, 1880. 
