PHYSIOLOGY AND EMBRYOLOGY. 
215 
Stebbing, T, On the Genus Bathyporeia. Ann. N. H. (4) xv. pp. 74- 
78, pi. iii. 
StuxbeRG, a. Om Nord Amerika’s Oniscider. OEfv. Ak. Forh. xxxii. 
No. 2, pp. 43-63. 
VoGL, Oajetan V. Beitrag zur Kenntniss der Land-Isopoden. Verb. 
z.-b. Wien, xxv. pp. 601-618, pis. xi. & xii. 
WiLLEMOES-SuHM, R. V. Briefe von der Challenger Expedition. Z. 
wiss. Zool. xxv. pt. 2, pp. xxv.-xlvi. 
. On some Atlantic Crustacea from the Challenger Expedition. 
Tr. L. S. (2) i. pp. 23-68, pis. vii.-x. 
Wood-Mason, J. On new or little-known Crustaceans. P. A. S. B. 1876, . 
pp. 230-232. 
Physiology and Embryology. 
A. S. Packard gives a popular account of the development in the 
different orders 6f Crustacea^ extracted from the works of Rathke, 
Thompson, Fr. Muller, Claus, Dohrn, Metschnikoff, and others, and from 
his own observations ; he recapitulates the stages through which they 
pass to the perfect state, in the following manner : — 
Barnacles and root-barnacles : 1, Morula ; 2, Nauplius or larva; 3, a 
bivalved “ pupal ” stage ; 4, Adult retrograde condition. 
Copepods : 1, Morula; 2, Nauplius ; 3, Cyclopian (in certain genera 
embryonic) stage ; 4, Adult Copepod, in some forms being a 
degraded more or less amorphous parasitic condition (^Lernmdce). 
Ostracoda and Cladocera : Nauplius stage in the egg. 
King Crab (Limulus) : 1, Peripheral or partial segmentation of the 
yelk ; 2, No true Nauplius stage, but the six legs appear simul» 
taneously; 3, Trilobitic stage ; 4, Adult Limulus iovm attained 
• before hatching. 
Phyllopods : Embryological development not known. After hatching, 
they pass through a Nauplius stage, and attain the adult condition 
after a number of moults. 
Nebalia: 1, Partial segmentation of the yelk; 2, Nauplius stage in 
the egg ; 3, Larval form like the adult, no metamorphosis. 
Tetradecapods (Isopods and Amphipods) : 1, Segmentation of the 
yelk partial or total {Morula)^ even in the same genus {Gammarus') 
both modes have been observed ; 2, Nauplius stage in the egg; 3, 
Larva hatching in the form of the adult, with the full number of 
feet, no metamorphosis, 
. Decapods : 1, Partial segmentation of the yelk ; 2, Nauplius stage, 
either free swimming {Peneus setigerus) or undergone in the egg ; 
3, Zoea stage, sometimes (common lobster) suppressed ; 4, Megalops 
stage in many crabs, in a few cases no metamorphosis ; 6, adult. 
Am. Nat. ix. pp. 682-606, with many woodcuts. 
Sars’ observations on the development of the lobster [Zool. Rec. xi. 
p. 201] are recapitulated by Gervais, J. Zool. iv. pp. 362 & 363. 
A. Sanderb, Tr. Micr. Soc. 1876, pp. 104-111, pis. liv. & Iv., has 
