The synonymy given here, whereby five suppo.-ed distinct species of En)>lm*i<i 

 .-ire merged into E. mperla, Dana, is the result of a careful examination of the 

 abundant and valuable 'Discovery' material, aided by a comparison with the 

 'Challenger' and 'Southern Cross' types (for which I am great lv indcbred to 

 Mr. E. W. L. Holt), and the small collection from the zoological museum of I'niversitv 

 < 'ollege, Dundee. 



Reasons for these views were briefly .-tated in the preliminary notice of this 

 collection, and the opinions as to the synonymy of this species, as far a- they concern 

 Euphausia antarctica and E. //ntmi?//, have recently been confirmed and adopted by 

 Coutiere (190G) as a result of his examination of the collection of the French 

 Antarctic Expedition. A fuller justification for these opinions is given below, together 

 with some notes on the growth changes, and sexual differences 



Pi-male. This sex has been very well described under the names I-'.. niiirr<ii/i by 

 <i. < I. Sars (1885), and E. <nixt,-<iHs by Hodgson (1902). 



The ' Discovery specimens present some slight differences from Sars' description. 

 but the examination of his type specimens proves them to be due to errors on Sars' 

 parr. They may be noted under their separate heads as follows : 



(1) Pmiuiil .-'I'ln,'. Sars states that this spine is wanting in E. nnin-ii;//. but the 

 type specimen shows it to be distinct, well-developed and simple, but not visible from 

 the side from which Sars took his drawing All the 'Discovery' specimens show a 

 well -developed simple preanal spine. 



(_>) Small blunt .>/<///. on t/i>- outer <Hxt,i] corner of the first joint / the antennular 

 peduncle. This spine is not shown in Sars' figures nor mentioned in his description. 

 It is. however, clearly visible in the type in lateral view, but in dorsal view is ijuiic 

 obscured by the numerous setae arming the basal joint of the peduncle, which arc well 

 preserved and very opaque. The 'Discovery' material conforms to the type in 

 possessing this spine well-developed. 



(::) Ti'nniiHil *i>h- I'll tli,' outer //*</?///// <>f tin- mil' nmil ><w/. . Sar~ mentions tins 

 spine in his description as very small, but does not figure it. It is, in tact, not visible 

 in his type from the dorsal aspect, owing to its being slightly veiltrally deflexed, and 

 the specimen is so well preserved and rigid, that the pre uiv necessary to place it 

 dorsal surface uppermost for drawing is not sufficient to straighten out the spine and 

 render it visible in dorsal view. 



(4) Shape of the epimerol />/<if>- <>/ t/m j><'iinltin><if, .*.////./// ,</'///. pleon.- Sars both 

 describes and figures the penultimate epimeral plate as acute and triangular, but in the 

 type and the 'Discovery' material, whereas these plates have substantially the.-ame 

 shape as depicted by Sars, the apex in all is bluntly rounded instead of acutely pointed. 



(5) S/iii/nl,* on ///, i/m-.^il surface /' /// telson. Sars figures and describes three 

 pairs in I-'., murrayi, but. as a matter of fact, (lie number i- subject to variation, an 

 additional pair anterior t<> the three shown by Sar> being frequently noticed. In all 



VOL. IV. K 



