REPOET ON THE STOMATOPODA. HI 



and with a wide telson with the marginal spines on its posterior edge. For this genus I 

 liave proposed the name Coronida, and I have shown that we are acquainted with two 

 species which are to be referred to it. If this phylogenetic generalisation be correct, we 

 should expect the larva of this genus to unite in itself characteristics of both Alima and 

 Erichthus, and to stand in somewhat the same relation to them as that which the adult 

 Coronida bears to Lysiosquilla and Squilla. We should expect it to be a stem-form from 

 which both of these larvge may be derived. The Challenger eoUection contains no larv^ 

 of this character, and so far as I am aware only a single specimen has been observed. 

 This remarkable and interesting form, from the Atlantic, is shown in Claus's figure 14. It 

 IS much more advanced than any other Erichthus or Squillenchthus larva which has ever 

 been described, resembling in this respect an AJima larva, and like the advanced Alima 

 larvae it has well developed gills, a long annulated flagellum on the second antenna, 

 a mandibular palpus, and its first five pairs of abdominal feet are, like those of the Alima- 

 larva, more perfectly developed than in Erichthus, and it resembles all Alirtia larv» and 

 difi-ers from all Erichthus larvae in the presence of numerous (twelve) secondary spines 

 between the intermediate and submedian spines of the telson. Like all Alima larv^, 

 and the young and a few of the old Lysiosquilla Erichthus larvae, the lateral edges of the 

 carapace are fringed with spines, but these edges are folded downwards and inwards and 

 m all other respects it is an Erichthus. The many points in which it resembles Erichthus 

 and difi-ers from all Alimie, joined to many other points of resemblance to Alima and 

 difi-erence from all Erichthi, render it peculiarly interesting. It is so far advanced that it 

 undoubtedly assumes its adult form after the moult which follows the stage sho^vn in 

 Claus's figure, and the adult rostrum with a long acute median spine is visible under the 

 cuticle. As it has a wide flat hind body and spines in the dactyle it is not a Protosquilla 

 or a Gonodactylus, or a Pseudosquilla, and the long spine on the rostrum shows that it is 

 neither a Squilla nor a Lysiosquilla. The telson is wider than long, its marginal spines 

 are crowded backwards, the figure indicates that the sixth abdominal somite Is probably 

 fused with the telson, and the uropods are very small, and the two spines are very small 

 and equal. 



All its characteristics indicate that it is a very primitive and sj-nthetic type, and 

 whUe it may possibly belong to an unknown genus, all the indirect evidence which it 

 furnishes indicates very strongly that it is either the larva of Coronida, or else of some 

 closely allied form. I propose for it the provisional generic and specific names Erich- 

 ihalima synthetica. 



Pseudeiichthus and the Metamorphosis of Pseudosquilla. 



Claus has traced to the adult Pseudosquilla a long narrow EHchthus larva which 

 diflfers from Lysioerichthus in the shape of the carapace, which is narrow and short, and 



