THE GENUS ERETMOCARIS .357 



Stage II. Length 3 mm. (Figs. 8-10). 



Rostrum slender, without dorsal teeth, reaching to base of antenna! scale. Carapace 

 with small supra-orbital spines ; ventral margin with three teeth. Abdominal somite 5 

 with a pair of dorsal spines. Telson less deeply concave, with 8+8 spines. 



Eyes on long stalks about half length of eye ; eye with stalk about one-quarter length 

 of body. 



Peduncle of antennule one-quarter length of body, unsegmented, with base a little 

 enlarged ; exopod apparently lacking the feathered seta, but with five aesthetes of which 

 one, as before, has a membranous border. 



Antennal scale with ten inner and terminal setae, but only three distal segments. Outer 

 distal seta much longer than proximal one ; endopod shorter and more slender, with seta 

 as before. Exopods of maxillipedes 1-3 with four terminal setae; maxillipede 2 with six 

 and maxillipede 3 with eight lateral setae. Leg i a large biramous rudiment. 



Stage III. Length 3-5 mm. (Fig. 11). 



Rostrum short, not reaching base of antennal scale. Telson separated from somite 6, 

 slightly broader than long, with 8+8 spines, of which one is lateral. 



Eyestalk longer and more slender than in stage II; eye with stalk to body as i : 3-5. 

 Peduncle of antennule as long as eye, of two segments, and with small endopod. 

 Antennal scale unchanged ; flagellum reduced to a very small knob without a seta. 



Leg I developed, with exopod. 



Pleopods absent. Uropods developed, the endopod small, without setae. 



Of this form I have no older stages. 



Species R.S. II, Lysmata sp. 



Stage II. Length z-^-z-'] mm. (Fig. 12). 



Rostrum very small, not extending beyond frontal lobe. Carapace with anterior and 

 posterior papillae, but no median spine; supra-orbital and antennal spines absent; 

 pterygostomial spine present, and two small marginal teeth. Abdominal somite 5 

 without dorsal spines. Telson not deeply concave, with 8+8 spines (in one specimen 

 7+7 only). 



Eye with stalk about one-third length of body. Peduncle of antennule nearly one- 

 third of body length. Antennal scale very long and slender, with eleven inner and 

 terminal setae ; two distal segments distinct ; one outer seta near end ; endopod a very 

 small process one-tenth length of scale. 



Leg I fully developed, endopod very long and slender. Leg 5 fully developed, the 

 propod very long and slightly expanded; lengths of segments (in mm.): 



Ischio-merus Carpus Propodus Dactylus 



i'48 1-14 i'3 "06 



Between legs i and 5 is a single large biramous rudiment. Exopods of maxillipedes and 

 leg I with four terminal setae; total setae 5, 10, 12, 10. Pleopods absent. 

 General colour red. 



