II 

 I 



2 



3 

 6 



DEVELOPMENT OF E. SPINIFERA 295 



Illig described and figured stages IV-VI as well as stage VII which was not present 

 at St. 90, but not stage III. One of the post-larval forms from St. 90 was smaller than, 

 and differed in other ways from, any I had seen (p. 302). 



The larval stages and the number of each that I found are as follows : 



Calyptopis: Second ... ... ... ••• ••• ... ••- ••• ■•■ i 



Third 5 



Furcilia: 



Stage I. With I pair of non-setose pleopods 



With I pair of setose, 2 pairs of non-setose pleopods ... 



Stage II. With I pair of setose, 3 pairs of non-setose pleopods 



Stage III. With 4 pairs of setose, i pair of non-setose pleopods 



Stage IV. With 5 pairs of setose pleopods, antennal endopod unsegmented 



Stage V. With antennal endopod segmented, 5 terminal spines on telson 3 



Stage VI. With antennal endopod segmented, 3 terminal spines on telson 5 



Stage VII. With antennal endopod segmented, i terminal spine on telson 9 



Second Calyptopis (Fig. 40 a) 

 Only one specimen was found, 1-9 mm. long. 



The carapace is expanded over each eye. The anterior margin is emarginate between 

 the expansions; the lateral margins are constricted where the expansions end behind 

 the eyes. The margin of the carapace anterior to these constrictions is denticulate. There 

 is a very abrupt and high dorsal organ, conical in shape, and a median posterior pro- 

 jection. 



The antennular peduncle is of three indistinct segments. The antennae, mandibles, 

 first and second maxillae and the first pair of thoracic limbs are present as in this stage 

 of other species. 



The abdomen is of six segments. The telson is slightly expanded distally ; it has seven 

 terminal spines of which the innermost is the smallest and three pairs of postero-lateral 

 spines of which the middlemost is the longest. 



Third Calyptopis (Fig. 40 b) 

 Description based on the examination of four specimens, 3 -0-3 -3 mm. long. 

 The dorsal organ is conical, abrupt and high. The carapace is constricted behind the 

 eyes and broader in front, where there is a wide and rounded expansion over each eye, 

 than behind. Between the expansions the anterior margin is emarginate. The margin 

 of the front part of the carapace, anterior to the constriction behind the eyes, is beset with 

 strong denticles, those on the lateral margin directed slightly forsvards, those on the 

 anterior slightly inwards. There is a pair of lateral denticles and a strong median pos- 

 terior projection. 



The antennular peduncle is of three segments, the spine of the first longer than the 

 sum of the second and third. 



