118 



Gen. 28. DySpOntiUS, Tliorell, 1859. 



Syn: Gallopontius, Giesbrecht. 



Generic Characters. Anterior division of body broad and expanded, 

 with the epimeral lappets well marked ; those of penultimate segment, however, 

 very small. Tail short, with the genital segment considerably expanded. Anterior 

 antennae in female generally 9-articulate, with the 2nd joint the largest. Siphon 

 rather strong, with the basal part only slightly dilated. Maxillae with the lobes 

 not very unequal, the inner one carrying a single apical seta, the outer one 2 such 

 setse. Maxillipeds moderately slender. Natatory legs with the rami comparatively 

 narrow, terminal joint of outer ramus in 1st pair small, with only 2 spines out- 

 side and 2 setse inside. 4th pair of legs with the outer ramus well developed, 

 inner however wholly absent. Free joint of last pair of legs with only 2 apical 

 bristles. 



Remarks. This genus, the type of the present family, was established 

 in the year 1859 by Thorell, who placed it together with the genus Ascomyzon 

 within his family Ascomyzontidce. The genus Gallopontius, at first established 

 by Giesbrecht for a Neapolitan species, G. fringilla, was subsequently withdrawn 

 by that author and identified with Thorell's genus. In addition to the above- 

 named species another Neapolitan species was described as D. passer, 



The chief characters of the present genus are found in the form of the 

 siphon, the armature of the terminal joint of the outer ramus in the 1st pair of 

 legs, and the total absence of an inner ramus in the 4th pair. In the last-named 

 character it however agrees with 2 other genera, viz., Cryplopontius and Ptero- 

 pouthfs. To the fauna of Norway belongs only the type species, to be de- 

 scribed below. 



66. Dyspontius striatus, Thorell. 



(PL LXX). 



Dyftpnntim strifttufi, Thorell, Bidrag til kannedomen om Crustaceer, som lefva i arter af sla^gtet 



Ascidia, p. 81. PL XIV, fig. 22. 



Syn: Gallopontius rotundus, Giesbrecht. 



Specific Characters. Female. Body pronouncedly depressed, with the 

 anterior division broad and expanded, greatest width almost equalling the length. 

 Cephalic segment very large, occupying rather more than half the total length, 

 postero-lateral corners prominent, frontal part evenly rounded, without any dorsal 

 crest; pleural parts of the segment longitudinally striated. Epimeral lappets of 

 the 2 succeeding segments well developed, those of penultimate segment, however, 



