1 50 



7 joints, the 2nd of which is invariably the longest. Posterior antennae more 

 or less pronouncedly prehensile, being armed at the tip with a varying number 

 of curved claws. Oral area far remote from the antenna! one, and occupying 

 about the centre of the ventral face of the cephalic segment. Anterior lip 

 deeply cleft in the middle or bilobate, edges of the lobes smooth. Lateral lips 

 absent. Maxillae terminating in a lamellar falciform lappet curving anteriorly 

 and exserted to a thin flexible point; palp in most cases of inconsiderable 

 size. Anterior maxillipeds with the proximal joint naked, distal joint provided 

 inside with a slender spine, its end being, as a rule, exserted to a thin seti- 

 form lash abruptly bent at the base and turned anteriorly, with the outer edge 

 finely spinulose. Posterior maxillipeds more or less imperfectly developed in 

 female, but transformed in male to strong grasping organs. Natatory legs, as 

 a rule, of normal structure, though the inner ramus of the 4th pair may in 

 some cases be more or less reduced. Last pair of legs, as a rule, represented 

 on each side by a single joint extended laterally. 



Remarks. The type of the present family is the genus Lichomolgus 

 of Thorell, with which in recent times a number of more or less nearly allied 

 genera have been associated, to form a quite natural group. From the 

 Clausidiidce this family is pretty well distinguished by the generally pronoun- 

 cedly prehensile character of the posterior antennae, as also by the rather 

 different structure of the oral parts. In these respects it agrees much more 

 closely with another family, viz., the Sapphirinidce, and indeed, for this reason, 

 Thorell referred his genus Lichomolgus to that family. The external appea- 

 rance of the body is however very unlike that met with in the said family, 

 being perfectly cyclopoid. Nor are there any traces of the peculiar ocular 

 lenses so characteristic of the Sapphirinidce. The present family is well repre- 

 sented in the Fauna of Norway, several genera and species having been 

 observed, to be described in the succeeding pages. 



Gen. 38. Lichomolgus, Thorell, 1860. 



Generic Characters. Anterior division of body rather dilated and pro- 

 nouncedly applanated, with the 1st trunk-segment in most cases defined from 

 the cephalon by a well-marked suture dorsally. Tail slender and composed 

 of the usual number of segments; the genital one in male greatly inflated. 

 Integuments, as a rule, very thin and soft. Anterior antennas slender and 



