198 Part TIL — Eleventh Annual Report 



sealing-wax ; the specimen is usually divided into two parts by an incision 

 immediately in front of the first pair of swimming feet. The mouth 

 appendages and antennae, or the swimming feet, are then first carefully 

 dissected off — each pair by itself — and at once mounted under a separate 

 cover-glass (or bit of cover-glass). A complete series of appendages is 

 sometimes mounted on a single slide— this is done partly for convenience, 

 and partly to save time — and when this is done the series always begins 

 from the same end of the slide, and each appendage or pair of appendages 

 occupies a particular position on the slide ; and also, if very small, it is 

 surrounded by a minute ring drawn with common writing-ink. There is 

 thus no confusion, time is made the most of, and comparatively few slides 

 are required. 



CRUSTACEA. 

 COPEPODA. 



Family HARPACTICIDyE. 



Genus Longipedia, Claus (1863). 



Longipedia coronata, Claus. 



As there appears to have been some misconception in regard to 

 Longipedia coronata, Claus, the following description of what appears to 

 be a typical female, and of two other and distinct forms that have prob- 

 ably been accidentally included with it in the same species, may be of 

 interest. 



Longipedia coronata, Claus. (PI. II. figs. 1-13.) 



1863. Longipedia coronata., Claus, 'Die frei lebenden Copepoden,' 

 p. 110, pl. xiv. 



1864. Longipedia coronata, Boeck, ' Oversigt Norges Copepoder,' 

 p. 252. 



1880. Longipedia coronata, Brady, ' Mon. Brit. Copep.,' vol. ii. p. 



6, pis. xxxiv.-xxxv. (pars.). 

 1882. Longipedia coronata, Giesbrecht, 'Die frei lebenden Copep. 



' der Kieler Fohrde,' p. 99, pis. i., iv.-xii. (? var.). 



1892. Longipedia coronata, Canu, 'Les Copep. du Boulon.,' p. 146. 



1893. Longipedia coronata, T. and A. Scott, 'Ann. Scot. Nat. 

 ' Hist.,' vol. ii. pt. 2, p. 91, pl. ii. figs. 4-6. 



Length from apex of rostrum to end of caudal stylets (exclusive of 

 setae) 1*5 mm. ( T Yth of an inch). Rostrum broad, with a bluntly rounded 

 apex. The form of the animal seen from above is narrow, elongate, and 

 tapering gradually to the end of the abdomen ; the whole length is about 

 equal to four times the breadth at the posterior end of the first cephalo- 

 thoracic segment. Anterior antenna? short, stout, and curved ; densely 

 setiferous, most of the setae being plumose in varying degrees ; an elongate 

 sensory filament springs from the third joint, and two similar but short 

 filaments from the extremity of the antennae. Primary branch of the 

 posterior antenna?, three-jointed. The secondary branch is rather longer 

 than the primary and six-jointed; the joints become longer and narrower 

 towards the apex, so that while the length of the first joint is equal to 

 little more than half the breadth, the last is about one and a half times 

 longer than broad. The posterior antenna? bear numerous plumose 

 setae. The mandibles have the masticatory portion broad, the 

 truncate end of which is armed both with papilliform and pointed 

 teeth. The two branches of the palp arise from a dilated base ; one of 

 the branches is stout and apparently one-jointed ; the other is more 



