REPORT ON THE STOMATOPODA. 79 



iu 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 theii* 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 hradyi of A. Milne-Edwards, and Gono- 

 dactyhis trachurus, Miers, resemble each other very closely and present many points of 

 resemblance to the genus Protosquilla, but they are quite 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 similar 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 in a distinct genus 

 Chlorida, 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 iu 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 on the posterior end of the body are strikingly like those of Protosquilla 

 guerinii, since Milne-Edwards describes this part of the body of Coronida hradyi 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 



