34 DREDGING REPORTS. 



pair of feet, in the male long and slender, pointed ; the left con- 

 sisting of three cylindrical tapering joints, of which the middle is 

 the longest; the right composed of five joints, of which the first 

 three are nearly equal, the fourth shorter, and the fifth very 

 small and sharp. The fifth pair in the female is obsolete. First 

 abdominal segment, in the female, very tumid in front. Terminal 

 abdominal segments very short. Caudal setae short ; about half 

 the length of the abdomen. 



This species was doubtfully referred, in a previous report, 

 (Trans. Tyneside Nat. Field Club, vol. YI, p. 188,) to Phdenna 

 spinifera, Claus ; but Dr. Claus has kindly examined specimens 

 which I forwarded to him, and pronounced them to belong to a 

 hitherto unclescribed species, referable to the genus Calanas, from 

 which it differs, however, in the absence of the fifth pair of feet in 

 the female. To meet this peculiarity I have slightly modified the 

 definition of the genus here given. The species is peculiarly diffi- 

 cult to examine satisfactorily on account of its extreme fragility, 

 it being scarcely possible, in any of my gatherings, to find an un- 

 mutilated specimen. By far the greater number are females devoid 

 of the rudimentary feet, but some rare specimens showed these 

 organs in a peculiar form (plate I, fig. 11), which I at one time 

 supposed to belong to the female. Dr. Claus has, however, 

 pointed out to me that these are in reality the fifth feet of the 

 immature male, and that where they occur there are always cor- 

 responding marks of immaturity in the development of the abdo- 

 minal segments. 



C. Clausii is an abundant and widely-spread species, occurring 

 both in tidal pools and in the open sea. I have specimens from 

 Shetland and the Channel Islands, and from many localities, 

 both littoral and pelagic, in the Northumberland and Durham 

 districts. 



I have much pleasure in dedicating this interesting species to 

 Dr. Claus, and I regret that the imperfect state of my specimens 

 has prevented my figuring it as fully and accurately as I could 

 have wished. 



Genus. DIAS, Lilljcborg. 



Anterior antenna composed of 19-21 joints, beset with long 



