ON DEVELOPMENT OF ATYEPHIRA COMPEESSA. 
425 
15. Balfour. — "Notes on the Development of the Araneina,” ‘ Q. J. M. S.,’ 
vol. xx, N.S. 
16. Parker. — “ An Account of Reichenbach’s Researches on the Develop- 
ment of the Fresh-water Crayfish,” ‘ Q. J. M. S.,’ vol. xviii, N.S. 
17. Faxon. — " On the Development of Palaemonites vulgaris,” ‘Bul- 
letin of the Museum of Comparative Zoology at Harvard College, 
Cambridge, Mass.,’ vol. v, 1878-1879. 
18. Birge. — “Notes on the Development of Panopeus sayi (Smith),” 
‘ Studies from the Biological Laboratory, John Hopkins University,’ 
vol. ii. No. 4, 1883. 
EXPLANATION OF PLATES XXV, XXVI, XXVII, 
AND XXVIII, 
Illustrating Mr. Ishikawa’s Paper “ On the Development of 
a Freshwater Macrurous Crustacean, Atyephira com- 
pressa, De Haan.” 
List of Reference Letters, 
amb. Ambulatory leg. an. Anus. At. 1. Antenna. At. 2. Antennule. 
b. c. Blood-corpuscles, bl. Blastoderm, b. s. Blood space, bp. Basipodite. 
c. d. Cephalic depression. ce. Caecum. cp. Carapace. exp, Coxopodite. 
cx. s. Coxopoditic setae, c. t. Connective tissue. d. s. Dorsal spine, e. e. 
External epithelium, en. Endopodite. ep. Ectoderm, f. e. Follicular epi- 
thelium. f. m. Flexor muscle, ger. Germogen. g. g. Green gland, g. m. 
Gastrula mouth, h. Heart, hy. Endoderm. i. e. o. Internal epithelium of 
the ovary, i. e. od. Internal epithelium of the oviduct, in. Intestine, lb. 
Labrum. Iv. Liver, mb. Structureless membrane. md. Mandible. nix. 
Maxilla, mxp. Maxillipede. ms. Mesoderm, n. Nerve, n. c. Nucleus of 
the connective tissue, o. od. External orifice of the oviduct, od. Oviduct. 
ocl. Simple eye. OC. Compound eye. ol. s. Olfactory setae, ce. (Esophagus. 
p.F Palp? pd. Proctodaeum. p.o. Primordial ova. pdb'. Podobranchia 
modified, rs. Rostrum, sd. Stomodaeum. sg. Scaphognathite. s.gn. Supra- 
cesophageal nerve ganglion. s. ms. Secondary mesoderm, nil. Vitellogen. 
vac. Vacuole, w. y. White yolk. y.s. Yolk-spheiule. y. sg. Yolk-segment. 
Fig. 1. — Coxopodite of the third ambulatory leg of the female Atyephira, 
showing the external orifice of the oviduct. X 12. 
