Dr. T. Scott on British Copepoda. 569 



Remarks. — In Beatricella mimica the first pair of thoracic 

 feet have a close resemblance to tliose of certain species of 

 Dactylopusia and Ameira ; hence the specific name. 



Habitat. — Firtiis of Forth and Clyde, Moray Firth, vicinity 

 of Plymouth, &c., but not very common *. 



DelavaUa Normani, T. Scott, nom. nov. 



1899. DelavaUa Gieshrechti, Tar., T. Scott, Seventeenth F. B. Report, 

 part iii. p. 254, pi. xiii. figs. 20-22. 



A few specimens of a DelavaUa were obtained at Hunters ton. 

 Firth of Clyde, in the autumn of 1898 ; they resembled to 

 some extent a species previously described by T. and A. Scott 

 under the name of DelavaUa Gieshrechti, but differed in one 

 or two points, and notably in the absence of the peculiar tail- 

 setse which are so characteristic of D. Gieshrechti ; but as it 

 was considered that the differences observed might, to some 

 extent at least, be due to difference in habitat, and as only 

 one or two specimens had been noticed, they were recorded 

 simply as " DelavaUa Gieshrechti y&Y." 



Subsequently, however, it was ascertained that the Rev. 

 Canon A. M. Norman had collected the same form at 

 Salcombe, South Devon, in 1875, and again in 1903, as well 

 as at other places on the coasts of Devon and Cornwall. 

 The examination of these additional specimens showed that 

 the differences previously observed were constant and not due 

 to difference in local surroundings ; this form should there- 

 fore be regarded as a distinct species, and the name I propose 

 for it is DelavaUa Normani. 



In this species the two-jointed inner branches are only 

 slightly longer than the outer, the first joint is robust and 

 rather more than half the length of the second, while the 

 second is not only more elongated than the first, but is also 

 distinctly narrower and tapers slightly towards the distal 

 extremity ; the apical seta, which is fully longer than the 

 second joint, is moderately stout and spiniform, and there are 

 three setae on the inner margin of the second and one on the 

 first joint. 



In the fifth pair in the female the basal joint is short and 

 furnished interiorly with four tolerably long plumose setse 

 along its lower edge ; they are arranged in pairs, one pair 

 being near the inner angle, the other close behind the 



* A second species — DelavaUa {Beatricella) cemula, T. Scott, — in which 

 the three joints of the inner branches of the first pair of thoracic feet are 

 nearly of equal length, is described in the Eleventh Report of the Fishery 

 Board for Scotland, pt. iii. p. 204, pi. iv. figs. 36-47 (1893J. 



