CRUSTACEA. 629 



Sp. Bomolochus parvulus V. NORDM. 1. 1. p. 135; Bomol. Belones BURM. 

 1. 1. Tab. xxiv. figs, i 6. 



Ergasilus NORDM. Antennae 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 NORDM. 1. 1. Tab. n. ; Ergasilus gibbus NORDM. ib. 

 Tab. in. figs. i6, &c. To this genus also belongs, as KROEYER justly 

 remarked, the Lerncea Lavareti described by OTTO FABRICIUS, Skrivter of 

 naturk. SelsTcabet. in. 2, 1794, p. 21, Tab. in. figs. I 5. 



Family V. Caligina. Body suboval, covered with a test 

 above. Cephalothoracic 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 antennae with two or 

 more, rarely with three joints, broad, short; posterior antennae 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. 



Lcemargus KROEYER. Anterior antennae triarticulate. Frontal 

 laminae none. Feet of the fourth, fifth and sixth pairs branchial, 

 with oars large, lamelliform and basal joints minute. 



Sp. Lcemargus muricatus KROEYER 1. 1. i. pp. 487 501, Tab. v. figs. A E, 

 MILNE EDWARDS Hist. d. Crust. PI. 39, fig. i ; found on OrikagoriscuA 

 mola. 



Cecrops LEACH. Frontal margin of cephalothoracic shield ex- 

 cised in the middle, produced at the sides into a rounded lobe. 

 Anterior antennae biarticulate. Feet of fourth, fifth and sixth pair 

 with basal joints large, lamellose, branchial and oars short, narrow. 



