REPOET OH THE STOMATOPODA. 
79 
in Protosquilla. The sixth abdominal somite narrow, with six longitudinal promin- 
ences. Telson very short and transverse, with two slender spines projecting backwards 
from its posterior margin, with their bases in contact on the middle line, and their 
tips slightly divergent. 
Comparison with the other Protosquilla? indicates that the two long spines of this 
species are the external marginal spines of the telson, which have become approximated 
on the middle line by the disappearance of almost the whole of the posterior border 
of the telson. 
Genus Coronida, n. gen. 
The two following species Gonodactylus bradyi of A. Milne-Edwards, and Gono- 
dactylus trachurus, Miers, resemble each other very closely and present many points of 
resemblance to the genus Protosquilla, but they are cpiite anomalous in other respects, 
since they present a most interesting and suggestive resemblance to Squilla, Lysiosquilla 
and Gonodactylus. Their features of resemblance to Gonodactylus, the enlargement of 
the base of the dactylus of the raptorial claw, the flat rectangular carapace, and the pointed 
rostrum, are at the same time features of resemblance to Protosquilla, and it seems 
probable that they are the living representatives of an ancestral type which was closely 
related on the one hand to Protosquilla, while on the other hand it was very si mil ar to 
the common type of which Lysiosquilla and Squilla are the divergent descendants. As 
the most primitive species of the genus Squilla are often placed hi a distinct genus 
Chloridci, while the lowest members of the genus Lysiosquilla are often placed in a 
distinct genus, Coronis, and as the features of resemblance to Squilla and Lysiosquilla, 
exhibited by the species now under discussion, point to a relationship with the lower rather 
than with the higher forms in these genera, I propose for them a generic name which 
shall express this fact, and the generic term Coronida is a compound of the first two 
syllables of Coronis, with the last two of Chlorida. 
The two species of Coronida resemble Protosquilla in the minuteness of the antennary 
scales and uropods ; in the fact that the anterior somites of the hind body are smooth, 
and conspicuously different from the sixth abdominal somite and telson, as well as in the 
presence of a median spine on the rostrum, and the enlargement of the base of the 
dactylus of the raptorial claw, and the shape of the carapace. 
It is not stated that the sixth abdominal somite is fused with the telson, but the 
markings ou the posterior end of the body are strikingly like those of Protosquilla 
guerinii, since Milne-Edwards describes this part of the body of Coronida bradyi in 
words which perfectly fit Protosquilla guerinii, as uniformly covered with numerous 
closely placed slender spines which are longest near the posterior margin, while Miers 
says that the posterior half of the fifth abdominal somite of Coronida trachura is 
