SALT-MARSHES OF NORTHUMBERLAND AND DURHAM. 131 



length of the internal, beset along nearly their whole length 

 v/ith short cilia. Length, iVth of an inch. 



Hah. — Brackish pools at Hartlepool, and in Hylton Dene, near 

 Sunderland, county of Durham ; and at Seaton Sluice, Northum- 

 berland. 



From the close agreement of my specimens, in most respects, 

 with the figures and descriptions given by Lilljeborg, I have no 

 doubt that they are referable to Tachidius brevicornis, though I 

 have not been able to make out precisely the structure of some 

 of the appendages of the mouth. A species closely allied to the 

 present, T. minutus, has recently been described by Prof. Claus.* 



Genus. DACTYLOPUS, Claus. 



General conformation of the body as in Canthocamptus. Su- 

 perior antennae mostly eight-jointed, armed with a flagellum ; 

 secondary branch of the lower antennae three -jointed. Lower 

 foot-jaws large, subchelate. Both joints of the first pair of 

 feet tri- articulate, armed with digitiform terminal setae, internal 

 branch prehensile, its first joint much elongated, apical joint 

 very short. 



Dactylopus tisboides. Clans. 



Dactylopus tisboides, Claus. Die frei lebenden Copepoden, p, 

 127, Taf. XVI., figs. 24-28; and Die Copepoden-Fauna 

 von Nizza, p. 27, Taf. III., figs. 1-7. {Not of Brady, In- 

 tellectual Observer, Vol. VII., p. 22.) 



Body rather broad and massive, often marked with reddish- 

 brown blotches. Head produced into a short, conical beak. 

 Upper antennae of the female short and densely setose along 

 their whole length, nine-jointed (eight-jointed, Claus), tapering 

 gradually from the base, the penultimate and ante-penultimate 

 joints very short. In the male the joints are twisted, and con- 

 stricted at the sutures ; no vesculiform swelling. The secondary 

 branch of the lower antenna is armed with four setee along its 

 upper margin, and three terminal setae. Last joint of the lower 



*Die Copcpotlen-Ffiinin von Nizzn. p. 24. 



