646 CLASS X. 
Calymene Bronan., Homalonotus Kornte, Asaphus BRronen. 
(Add some other genera omitted here). 
Sp. Calymene Blumenbachit Bronen., ToRRUBIA Apparato para la Historia 
natural Espanola, Madrid, 1754, fol. Tab. m1. fig. 4, p. 83; BLUMEN- 
BAcH Abb. naturhistor. Gegenstdinde, No. 50, Datm. 1. 1. Tab. 1. figs. 2, 3, 
a-c, &e. 
Note.—On these and some other genera, more numerous than 
seems to be necessary, consult the authors quoted ; on Battus Dau. 
see especially Bryricu, 1. s.44. Other genera, Hurypterus DEKAY, 
Cytherina HistncEr, seem scarcely to have their place here. 
Orper VIL. Lsopoda. 
Head distinct from the segment bearing the first pair of feet. 
Trunk divided into seven rings sustaining seven pairs of feet. 
Feet of trunk all undivided. Tail with segments different in 
number up to seven, supplied beneath with branchial foliaceous 
feet. Mandibles and maxilla mostly distinct. Antenne four, the 
lateral at least setaceous. Hyes two, sessile, in most composed of 
a cluster of ocelli, in others compound. 
Family XIV. picarides or Bopyrina. Antenne very short, 
imperfect, resembling tentacles. Feet short, incurved, hooked. 
Parasitic animalcules ; females much larger than males, broad, with 
eyes none or indistinct. 
Bopyrus LAatR. Five pairs of abdominal feet lamellose, con- 
cealed under abdomen. 
Compare H. Ratuxer, De Bopyro et Nereide commentationes anatomico- 
physiologice due. Cum tab. iii eneis. Rigze et Dorpati, 1737, 4to. 
The species hitherto known of this and the following genus live parasiti- 
cally on Palcemones (Carides), in the gill-cavity or on the ventral surface of 
these crustaceans (Bopyrus abdominalis KROEYER on Hippolyte). The sexual 
difference is in these animals when adult very great. The male is elongate, 
narrow, and keeps himself hidden between the gill-plates of the female. 
The female is much larger, broader and asymmetrical. There are seven 
pairs of short feet attached to the trunk, and five pairs of gill-leaves (abdo- 
minal feet) on the abdomen, which is divided into six rings, of which the 
hindmost is very small, and bears no gills. The young animals of each 
sex are on the contrary of similar form, with four pairs of feet and long 
posterior antenne (RaTHKE, Zur Morphologie, Reisebemerkungen aus 
Taurien, 8. 47—51). 
