REPORT ON THE STOMATOPODA. 
Ill 
and with a wide telson with the marginal spines on its posterior edge. For this genus I 
have proposed the name Coronidci, 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 
w r hich both of these larvse may be derived. The Challenger collection contains no larvae 
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 Squillerichthus larva which has ever 
been described, resembling in this respect an Alima larva, and like the advanced Alima 
larvae it has well developed gills, a long annulated flagellum on the second antennae, 
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 Alima larvae and 
differs from all Erichthus larvae in the presence of numerous (twelve) secondary spines 
between the intermediate and submedian spines of the telson. Like all Alima larvae, 
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 
in all other respects it is an Erichthus. The many points in which it resembles Erichthus 
and differs from all Alimse, joined to many other points of resemblance to Alima and 
difference 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 shown in 
Claus’s figure, and the adult rostrum with a long acute median spine is visible under the 
cuticle. As it has a wdcle 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 synthetic type, and 
while 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- 
thalima synthetica. 
Pseuderichthus and the Metamorphosis of Pseudosquilla. 
Claus has traced to the adult Pseudosquilla a long narrow Erichthus larva which 
differs from Lysioerichthus in the shape of the carapace, which is narrow and short, and 
