EN Dee 
Abdomen, 16. 
Acarus, 2. 
Accessory claws, 16. 
Achelia, 3, 9, 23, 24, 26, 27, 61. 
echinata, 26. 
hispida, 27. 
levis, 27. 
scabra, 147. 
spinosa, 24, 26. 
Alecinous, 5, 9, 26. 
vulgaris, 26. 
megacephalus, 26. 
Affinities of the Pycnogonids with the other Arthro- 
poda, 108. 
Alimentary canal and its appendages, 124. 
Ammothea, 9, 23, 24. 
achelioides, 24. 
brevipes, 24. 
carolinensis, 23. 
longipes, 23. 
pycnogonoides, 4, 23. 
Anatomy of the Pyenogonida, 100. 
Anomorhynchus smithii, 99. 
Anoplodactylus, 5, 82. 
lentus, 33. 
Andtliata, 2. 
Apertures of the heart, number of the, 127. 
Appendages, development of the, 138. 
food-yolk in the, 138. 
Arachnida, 2, 
Aranea, 2. 
Ascorhynchus, 4, 9, 10, 23, 25, 53, 147. 
abyssi, 4, 25, 55. 
glaber, 8, 25, 37, 53, 55. 
minutus, 7, 25, 55, 58. 
orthorhynchus, 7, 25, 57. 
ramipes, 25, 56, 58. 
Bdella, 2. 
Blastoderm, 137, 138. 
Bell, Th., referred to, 3. 
Blood-corpuscles, 128. 
Blood-corpuscles in the integumentary cavities, 103. 
Body of Pyenogonid, description of, 14. 
(ZOOL, CHALL. EXP,—PART x.—1881.) 
Bohm, R., referred to, 4, 6, 49, 51, 82, 134. 
Bohmia, 9, 24. 
chelata, 24. 
“Borstenapparat ” of the integument, 102. 
Bottom, nature of the, 12. 
Brachiopoda, 8. 
Briinnich, 2. 
Buchholz, R., referred to, 3. 
Cavanna, G., referred to, 5, 122, 128, 134. 
Cavities in the integument, 101. 
Cephalothoracic segment, 14. 
Circulatory apparatus, 127, 
Claparéde, A. R. E., referred to, 4. 
Claws, at the ends of the legs, 16. 
Cleavage of the egg, 136. 
Commensals of the legs of Pyenogonids, 144. 
Cceca of the intestine, number and structure of, 8, 
126. 
CoLossENDEID®, 23. 
Colossendeis, 3, 6, 9, 10, 23, 28, 59, 61, 70, 98. 
angusta, 4, 28, 65. 
borealis, 28, 98. 
brevipes, 8, 28, 29, 70, 72, 73. 
colossea, 147. 
gigas, 8, 28, 37, 61, 64, 65, 66, 67, 
147. 
gigas-leptorhynchus, 28, 65. 
gracilis, 8, 28, 29, 37, 59, 
73, 74. 
kroiyerti, 28. 
leptorhynchus, 7, 28, 37, 64, 66, 67, 
74, 147. 
macerrima, 147, 
media, 8, 28, 29, 70, 71, 73. 
megalonyx, T, 11, 28, 67. 
minuta, 8, 11, 29, 73. 
proboscidea, 7, 11, 28, 69, 98. 
robusta, 7, 28, 66. 
Commissures uniting the thoracic ganglia, 116. 
Commissures, circum-cesophageal, 109, 
Copulation observed, 131. 
Corniger hilgendorfi, 27. 
Costa, O. G., referred to, 5. 
CO TL ies 
K 22 
