266 DISCOVERY REPORTS 



The antennular peduncle is of three segments ; the spine from the outer distal corner 

 of the first is as long as, or more often longer than, the sum of the second and third 

 segments. 



Small sac-like buds of the second, or of the second and third, or even of the second, 

 third and fourth thoracic limbs, are present, the second bigger than the third and so on ; 

 they are enclosed in a common integument, not "free". 



The abdomen is of seven segments and is one and a half times as long as the carapace. 

 The postero-lateral corners of the telson are rounded, the posterior margin is straight or 

 feebly convex and has seven terminal spines which become progressively smaller from 

 the outside to the centre. 



Furcilia, stage I (Figs. 36 c-e) 



Description based on the examination of over forty specimens. Fifty-three were measured and 

 were 3-8-4-3 mm. long. 



In this stage there are four pairs of non-setose pleopods. 



The carapace may have no dorsal organ or a diminutive dorsal organ or a small projec- 

 tion of a less definite and characteristic shape. The frontal plate is either rectangular, the 

 anterior margin straight, the lateral margins parallel, the distal corners right angles, and 

 the whole broader than long, or it is a little narrower distally than at the base so that the 

 corners are not right angles and the whole is as long as broad. It is always broader and 

 squarer than that of the same stage of E. vallentini. 



The antennular spine is longer than, or equal in length to, the sum of the second and 

 third peduncular segments. 



The most usual condition of the thoracic limbs is that the buds of the second and 

 third are free, the former beginning to bifurcate or bifurcated (Fig. 36 e) and a quarter 

 to half the length of the first, the third about half the length of the second ; the buds of 

 the fourth to eighth are small and enclosed in a common integument. The bud of the 

 second limb may be the only one free and may or may not be bifurcated. 



There may or may not be a pair of small lateral projections from the tergum of the 

 first abdominal somite, which are the beginnings of the "tergal wings" of the later 

 stages and the adult. 



The abdomen is one and two-thirds as long as the carapace. The uropods reach as far 

 as the lateral spines of the telson. 



Furcilia, stage II (Figs. T,6f-h) 



Description based on the examination of forty specimens. One hundred and forty-two were 

 measured; one was 6-i mm. long but the others fell between 4-7 and 5-7 mm.^ 



In this stage there are four pairs of setose and one pair of non-setose pleopods. 



The carapace may have no dorsal organ or projection, a small or, more frequently, 

 very small dorsal organ (never so high and abrupt as that of E. vallentini), or a low pro- 

 jection. The frontal plate is usually wide with a rounded anterior margin sometimes 



1 Rustad records a length so low as 4-2 mm. 



