CRUSTACEA. 629 
Sp. Bomolochus parvulus V. Norvm. 1. 1. p. 135;—Bomol. Belones Burm. 
1. 1. Tab. xxiv. figs. 1—6. 
Ergasilus Norpm. Antenne four; anterior setaceous, sexarti- 
culate, posterior quadriarticulate, large, resembling arms, with last 
joint incurved, acuminate. Mouth inferior, resembling a conical 
tubercle in the middle nearly of cephalothorax. Ocellus single, 
frontal. Four natatory feet divided into two oars. Abdomen 
attenuated, terminated by double setiferous appendage. 
Sp. Ergasilus Sieboldii Norv. 1. 1. Tab. 11.; Hrgasilus gibbus Norpa. ib. 
Tab. 1. figs. 1—6, &c. To this genus also belongs, as KRorYER justly 
remarked, the Lernea Lavareti described by Orro Fasricius, Skrivter of 
naturh, Selskabet. U1. 2, 1794, p. 21, Tab. 111. figs. 1—5. 
Family V. Caligina. Body suboval, covered with a test 
above. Cephalothoracie shield large, broader than the rest of 
body, with anterior margin on each side mostly running out into a 
transverse process or frontal lamina. Anterior antenne with two or 
more, rarely with three joints, broad, short; posterior antenne biar- 
ticulate, uncinate, placed in front of the tubular mouth. Feet of 
the second pair uncinate. Ovaries external, filiform. Animals 
mostly not affixed, living parasitically upon the body of marine 
fishes. 
These crustaceans appear to me, more than the other families of 
this order, to approach the Xiphosura, a group that otherwise stands 
much apart. 
A. Lamellose appendages on the back. 
* Receptacles of eggs contortuplicate, covered by shield. 
Lemargus Kronyer. Anterior antenne triarticulate. Frontal 
lamine none. Feet of the fourth, fifth and sixth pairs branchial, 
with oars large, lamelliform and basal joints minute. 
Sp. Lemargus muricatus KRoeyER 1. 1. 1. pp. 487—501, Tab. v. figs. A—E, 
Mitne Epwarps Hist. d. Crust. Pl. 39, fig. 2; found on Orthagoriscus 
mola. 
Cecrops Leach. Frontal margin of cephalothoracic shield ex- 
cised in the middle, produced at the sides into a rounded lobe. 
Anterior antenne biarticulate. Feet of fourth, fifth and sixth pair 
with basal joints large, lamellose, branchial and oars short, narrow. 
