12 \y. 'S\. TATTERSALL. 



hitter size the species has all I lie adult characters, except perhaps the rostriiin, wlmli 

 has the margins hardly as concave as fully adult sj)ociiiu'ns. Examples of I o iiini. 

 in length are to ])e met with in January, and so were presumedly larv;e of the 

 preceding season, from which it would appear that the species takes at least one 

 year, and very prol)alilv longer, to reach the final adult size of ;32 mm. 



EUPH A USIA TIU ACAN T H A. 



(Plate IV., Figs. 1-3.) 

 Eiiphausia iriacant/ta. Holt and Tattersall, IDoC (1). 



Locdliti/ of ctipiure:— hat. 6G° 52' 00" ^., long. 178" 08' 15" E., 20:50 fathoms; 

 one specimen, immature male, 23 mm. 



Carapace (Plate IV., Fig. l), with a single lateral denticle posterior to the centre 

 of the lower margin of the carapace ; antero-lateral margins somewhat inflated over 

 the eyestalks, and then produced into a long and very acute rostrum, which extends 

 beyond the eyes and almost to the distal end of the basal joint of the antennular 

 peduncle ; a faint keel is present on the carapace behind the rostrum. 



PU'on (Plate IV., Fig. 1) with the posterior dorsal margin of the terga 

 of the third, fourth, and fifth segments produced into rather long, slender, very acute 

 and slightly curved median spines ; sixth segment rather long, nearly twice as long 

 as the fifth segment without the spine. 



E_yes somewhat damaged in the single specimen, but apparently rather small, 

 pyriform in shape. 



Autetiinilnr peduncle (Plate IV., Fig. 2) hearing on the inner distal corner of 

 the basal joint u well-developed bifid leaflet, the lappets of the leaflet of about equal 

 size; outer coiiier of the basal joint rounded and adorned with numerous rather long 

 plumose setso ; a row of six curved plumose setse on the dorsal surface of the basal 

 joint ; second joint with a simple acutely spiniform lappet arising from the median 

 anterior margin ; third joint slightly narrower and shorter than the second. 



Antennal peduncle shorter than the scale, the tliird joint a little shorter than 



the second. 



Anteniiiil siud.e reaching very slightly beyond the distal extremity of the second 

 joint of antennular peduncle, broadly oval in shape, about three times as long as 

 broad, apex broadlv and obtusely rounded, spine at the. distal end of the outer margin 

 small but distinct; spine on the out(>r distal comer of the Itasal joint long, slender 

 and smooth. 



First pleopods of the iu(d.e (Plate 1\'., Fig. ;>) oln'iously not fully metamorphosed, 

 since both the proximal and distal movable processes on the endopod ai'e small 

 and simple, and the uneinus on the middle lobe is without a secondary spinule. 



Telson with the portion between ami posterior to the suli-apieal spines acutely 

 iirodured and smodth : sulvapical spines extending beyond the apex ol' the telson, 



