THE GENUS ERETMOCARIS 359 



It will be seen that this stage differs very much from the corresponding stage in 

 species I in having legs i and 5 fully developed. In this respect it agrees with L. seti- 

 cmidata as described by Caroli. It is very doubtful if species I really belongs to this 

 genus. 



I have seen no specimens of stage III. 



Stage IV.? Length 4-3 mm. (Figs. 13-15). 



Rostrum very small. Carapace with minute tooth in front of anterior tubercle; 

 supra-orbital spine absent, but antennal and pterygostomial spines present. 



Telson widest at end ; greatest width equal to half length ; one pair of lateral spines 

 and two small spines at each angle, 8 + 8 in all. Anal spine absent. 



Eye with stalk to body as i : 3-5. Antennular peduncle as long as eye. Antennal scale 

 slender, with outer distal spine and no segmentation ; flagellum very small. 



Legs 1 , 2 and 5 fully developed, but leg 5 lost. Legs 3 and 4 rudimentary. Pleopods 

 absent. Endopod of uropod with setae. 



Stage V.-" Length 5-45 mm. 



Rostrum small, without teeth. Carapace with median dorsal tooth. There is a well- 

 marked groove in the gastric region from which lines can be faintly traced forwards and 

 downwards. These lines seem to be characteristic of this type of larva and will be shown 

 in figures of other forms in which they are clearer. 



Telson nearly three times as long as wide, with 6+6 spines, of which one pair is 

 lateral and one at the angle ; apparently one of the small spines at the angle and the 

 innermost spine are lost at this stage. 



Peduncle of antennule 1-4 mm., with rudiment of stylocerite; flagella about two-thirds 

 length of peduncle. Antennal scale nine times as long as wide; fiagellum one-sixth of 

 its length. Mouth-parts differing little from stage I. Exopod of maxilla with fifteen 

 setae, broad in front. 



Maxillipede i with endopod of four segments ; coxa well developed with long setae ; 

 exopod with five setae. All legs fully developed, but leg 5 lost. Pleopods absent. 



Between stage V and the last stage I have only a single specimen. Judging by the 

 increase in length of the carapace, it seems there must be three, or perhaps four, 

 intermediate stages, making eight or nine in all. Caroli describes eight stages in L. seti- 

 caudata, but admits that there may be a stage intermediate between his sixth and 

 "penultimate", making a total of nine. 



Stage VIII? Length 7 mm. 



Rostrum with one large dorsal spine. Carapace with supra-orbital, antennal and 

 pterygostomial spines, and with large median dorsal spine; surface with lines well 

 marked. 



Telson nearly three times as long as wide, with two pairs of small lateral spines and 

 5+5 distal "spines. 



Eye with stalk about one-third length of body. Peduncle of antennule 1-9 mm.; 



