198 



Occurrence. — This form is found parasitic in the branchial cavity of spe- 

 cies of Leander (Palsemon), such as L. serratus, squilla and Raihkei, sometimes 

 on the left, sometimes on the right side, in every case causing a strong lateral tuber- 

 osity of the carapace, similar to that caused by Bopyroides hippolytes (fig. 2 x). 

 It has not yet been recorded from Norway; but as at least 2 of the species of 

 Leander, which at times are infested by this parasite, are very common on 

 our coasts, it is most likely that, on a closer investigation, it will be found 

 to belong to the fauna of Norway. The figures of the female here given 

 are from a specimen found on Leander serratus from the Danish coast; that of 

 the male is copied from Sp. Bate and Westwood's work. 



Distribution. — Danish coast (Meinert), British Isles (Sp. Bate), coast of 

 France (Giard & Bonnier), Mediterranean. 



Gen. 2. BOpyrOideS, Stimpson, 1864. 



Syn : Bojiyms, Kroyer (not Latreille) 

 „ Gyge, Sp. Bate ('not Com. & Pane.) 



Generic Characters. — Body of female resembling that of Bopyrus, though 

 having the cephalon less broad, the lateral parts of mesosome perfectly smooth, 

 and the metasome distinctly segmentated. Posterior antennae 4-articulate. 

 Terminal joint of maxillipeds well defined, but rather narrow. 1st pair of incu- 

 batory plates concealing the whole ventral face of cephalon, and having the 

 distal segment broadly securiform; the succeeding pairs, as in Bopyrus, widely 

 apai't. Legs short, more or less concealed within the lateral margins of the 

 mesosome. Pleopoda obsolete, being replaced by slight fleshy ridges. Uropoda 

 wanting. Male with the segments of metasome fused together. Parasitic in 

 the branchial cavity of species of the genus bpirontocaris (Hippolyte). 



Remarks. — This genus, established by Stimpson, is nearly allied to 

 Bopyrus, from which it is chiefly distinguished by the absence of true pleopoda, 

 and by the male having all the segments of metasome fused together. The 

 species of this genus are found parasitic in the branchial cavity of different 

 Carida belonging to the genus Spirontocaris Sp. Bate (Hippolyte Kroyer). To 

 the fauna of Norway belongs only a single species, to be described below. 



