24 BRITISH COPEPODA. 



similar size ; in the male the fifth pair of feet (fig. 14) 

 is rather smaller, and consists of two tapering laminae 

 which are closely united almost to the apices, each of 

 which bears two nearly equal spines, the external 

 margins each having two slender setae ; the first male 

 abdominal segment (fig. 15) has attached to it a pair 

 of small bisetose appendages, much like rudimentary 

 feet. Caudal segments (fig. 16) subconical, a little 

 longer than the last abdominal ring ; tail setae two, the 

 innermost much the longer, stout and finely aculeate 

 along the margins, somewhat shorter than the abdo- 

 men, but about five times as long as the outer one. 

 The animal is of a deep brown colour, and is ^th of 

 an inch in length ('65 mm.). 



The only specimens of this species which I have 

 seen occurred in a tow-net gathering made by my 

 friend, Mr. E. C. Davison, in Kinsale Harbour, 

 Ireland, during the cruise of the "Porcupine;" there 

 were several examples, but, except one or two, all were 

 males. The type-specimens described by Dr. Glaus 

 were taken at Heligoland, these two localities being at 

 present the only recorded habitats of the species. 



Genus 7. ROBERTSONIA, nov. gen. 



Abdomen separated by a distinct constriction from 

 the cephalothorax ; anterior antennae short, 7- or 8- 

 jointed ; inner branch of posterior antennae of moderate 

 size, biarticulate ; mandible-palp composed of a large 



