350 
ZOOLOGICAL LITEIlATUllE. 
M. Hesse says that this form is one that is common to the 
larvae of all sucking Crustacea les pattes^ qiii sont^ comme dans 
tons les embryons des Crustaces sucenrs, an nomhre de trois 
paires"’^). This assertion we most decidedly think is not in ac- 
cordance with known facts. In the family to which M. Hesse 
assigns the genus Peltofjasterj the Bopyridee, this hypothesis is 
clearly negatived — nay, in tlie very genus Cryptothiria {LiriopCj 
Rathke and Lilljehorg), to which indubitably M. Hesse^s sup- 
posed male of Peltogaster belongs ; for the larvae of Cryptoniscus, 
Cryptothiria y Entoniscus, in which the females are almost as 
degraded as in Peltogaster, are those of true Isopoda of the 
Bopyroid type. We therefore think that Professor Lilljeborg^s 
arrangement of these parasites as a suborder of Cirripedes is per- 
fectly in accordance with our scientific knowledge of the subject. 
Peltogaster paguri, female, Hesse, t. vi. pp. 327 & 359, pi. xi. figs. 15-26, 
(embryo) figs. 27-33. 
Peltogaster paguriy male, vide Cryptothiria, p. 236. 
Sacculina carcini (Bathke), Hesse, p. 332, pi. xii. figs. 1-24. Of this 
species the author describes and figures the larvae in different progressive 
stages independently of the ovum. 
