SALT-MARSHES OF NORTHUMBERLAND AND DURHAM. 129 



small, three-jointed, the basal joint bearing one short apical seta, 

 the second none, the last six curved apical setae, and a tuft of 

 three or four — one long, the rest short — from the middle of the 

 upper margin. Upper foot-jaw stout and powerfully clawed ; 

 lower, weak, slender, bearing three long terminal setae and se- 

 veral shorter marginal ones. Mandibles small, and slenderly 

 toothed. First four pairs of feet alike ; branches short, and 

 nearly equal, the joints very broad ; marginal spines of the in- 

 ner branch ovate-lanceolate, divaricate. First abdominal seg- 

 ment produced at each side into a slender projecting angle from 

 which springs a short bi-articulate seta, representing the fifth 

 foot. To the second abdominal segment is attached at each side 

 a conspicuous triangular lamina, the external margin of which 

 bears four spines, the first and fourth (counting from above) 

 being nearly equal, the second shorter, the third much longer 

 and setiform : margins of the appendage finely ciliated. The 

 lower angles of the abdominal segments are produced down- 

 wards, appearing like slender appressed spines. Terminal or 

 caudal segments short, bearing one short seta in the middle, and 

 four terminal seta), the longest of which considerably exceeds 

 the length of the abdomen. Ovisacs two. 



Hah. — Brackish pools at Seaton Sluice, Northumberland. 



My specimens agree so closely in many respects with the 

 figures and description of Cycloids (Bquoreus, given by Fischer, 

 that I cannot entertain mucli doubt as to their identity. The 

 lower antennae are, however, considerably stouter than those 

 figured by Fischer, and are, ay, far as I can make out, only three- 

 jointed; the spinous armature of the triangular abdominal ap- 

 pendage of Fischer's specimens also slightly differs from that of 

 mine. It appears to me that the small bi-articulate cylindrical 

 appendage, attached just above the triangular plates, is the true 

 homologue of the fifth foot, and that these plates correspond 

 with the very similar appendages which are found in C. Lnh- 

 bockii (fig. 6 a) attached to the segment below the last pan* of 

 feet. Fischer's specimens were taken in "sea-water" at Ma- 

 deira. Mr. Norman has specimens from a marsh in the West of 

 Scotland. 



