EEPORT ON THE STOMATOPODA. 55 



both the Atlantic and the Pacific, with slight difi'erences between the specimens from 

 widely separated localities, and Pseudosquilla oculata, BruUe, from the Canaries and 

 Madeira, may possibly prove to be one of these varieties of Pseudosquilla ciliata, but 

 the species of Pseudosquilla aU need careful revision, as there is evidently considerable 

 variability. Peculiarities of colouration are unsafe guides in the study of preserved 

 specimens, and most of the other marks for the discrimination of species are known to 

 vary. Thus Heller says that his Pseiidosquilla oculata (Pseudosquilla ornata, jNIiers) 

 may be distinguished from Pseudosquilla stylifera [Pseudosquilla ciliata, Miers) by the 

 fact that the spine of the uropod is longer than the endopodite, but Miers' figure of 

 Pseudosquilla ciliata (Squillid^e, pi. iii. fig. 8) represents the spine as longer than the 

 endopodite uropod, and this is true of the Challenger specimens also. 



Genus Gonodactylus, Latreille. 



Diagnosis. — Stomatopoda with the sixth abdominal somite separated from the 

 telson by a movable joint ; the hind Ijody convex ; and the dactylus of the raptorial 

 claw enlarged at the base, and without marginal spines. Larva, an Erichthus, has the 

 postero-lateral spines of the carapace near the dorsal middle line, the lateral edges not 

 infolded, aud hatches from the egg as an Erichthoidina, which becomes converted into 

 an Erichthus without the loss of any of its appendages. 



Remarks. — All the Stomatopods with a dilated unarmed dactylus on the second 

 maxilliped are usually grouped in a single genus, Gonodactylus, but the collection of 

 species which are thus brought together is a very heterogeneous one, and little examina- 

 tion is necessary to show that the genus, as usually characterised, includes at least three 

 distinct assemblages of species. The species which have the sixth abdominal somite 

 immovably fused with the telson are obviously more closely related to each other than 

 they are to the other species of Gonodactylus, and as this fact should find its expression 

 in .the systematic zoology of the group I have placed these species by themselves in a 

 distinct genus Protosquilla, retaining in the genus Gonodactylus only those species 

 which have the telson movable. In the genus as thus restricted, two species, Gonodac- 

 tylus (Squilla) hradyi, A. Milne-Edwards, and Gonodactylus trachurus, Miers, differ 

 from all the remaining species in many features, such as the small size of the eyes, the 

 scales of the second antennae and the uropods ; the depression of the hind body, and the 

 presence of dentations on the inner edge of the dactylus of the raptorial claw. The pro- 

 priety of separating these species from the true Gonodactyli seems ob^'iou8, and as they 

 present many points of resemblance to both Lysiosquilla and Squilla, especially to the 

 least specialised species in these two genera, I suggest for them the generic name, 

 Coronida, compounded from Coronis, the generic name proposed by Latreille for the 

 Lysiosquilla with dilated appendages on the exposed thoracic limbs, and Chlorida, 



