REPORT ON THE AMPHIPODA. 263 



Posterior stylets very short and quite simple, as in Orchestia." He also observes that in 

 some species the carpus of the second pair of legs in males is " produced downwards back 

 of the hand, between the hand and the anterior extremity of the third joint (while in 

 Orchestia, the third joint is never separated from the hand by a portion of the carpus, and 

 the carpus is always short, transverse, and is situated wholly above the third joint)." 



But while AUorchedes is with sufficient clearness distinguished from OrchesHa, its own position 

 is otherwise involved in some obscurity. 



On page 1595, among the addenda et corrigenda, Dana remarks, "The genus Nicea of Nicolet 

 (loc. cit.) may possibly be the same with Allorchestes ; but the essential characteristics are 

 not given, excepting the non-palpigerous character of the mandible. Even if identical, tlie 

 genus does not antedate the author's, as the description of Allorchestes was first published 

 on July 1st of 1849. The maxillipeds are peculiar in having the surface tuberculate, and 

 the inner lamella is dentate only at apex, and there sparingly." 



Neither Dana, in describing Allorchestes, nor Nicolet, in describing Nicea, mentions the form of 

 the telson. Hence, in Mr. Faxon's opinion, the names were synonyms, and he agrees with 

 Spence Bate and Heller in allotting the name Allordiestes to the species which have the 

 telson entire, and the name Nicea to those in which the telson is divided. As shown in the 

 note on Eathke, 1837, I myself consider it right to assign the name Hyale to the latter, 

 and Hijalclla to the former. 



In passing on to the GammaridEe, it should be noiiced that, in defining the subfamily Stego- 

 cephalinffi, Dana follows Kr0yer in erroneously assigning a palp to the mandibles. The 

 genus Uristes which he places among the Lysianassinae is evidently based on misconception, 

 as Spence Bate has acutely pointed out. The description in Dana evidently corresponds 

 with the figure, and of this Spence Bate observes (B. M. Catalogue, p. 89, note), 

 " In the figure, Dana has drawn one of the first pair of pereiopoda instead of the second 

 pair of gnathopoda. The meros alirai/s overrides the carpus in the pereiopoda, and 

 underrides it in the gnathopoda." Dana places Alibrotus, Milne-Edwards, among the 

 Gammarinae, but it more probably belongs to the Lysianassinae. He separates Meera, Leach, 

 from Melita, Leach, on the ground that the former has the first antennas appendiculate and 

 the latter not so, whereas in both genera the upper antennae have an accessory flagellum. 

 His three species of Msa'a have been transferred by Spence Bate to Melita, and his Melita 

 tenuicnrnis to Msera, though with the notice that if the original description of this species, 

 assigning no secondary apjiendage to the upper antennae, is to be relied on, a new genus 

 must be formed for its reception, along with Melita Fresnelii, Savigny-Audouin. Axel 

 Boeck rests the discrimination of the two genera apparently only on these two points, that 

 in Melita the third joint of the mandibular-palp is elongate, and the inner branch of the 

 third uropods very small, while in Mai-a the third joint of the mandibular palp is not very 

 long, and the inner branch of the third uropods is nearly as long as the outer. 



The genera Dcrcothoi', Dana, and Pi/dihif, Dana, are by S. I. Smith made synonyms of Ei-ir- 

 fhonius, Milne-Edwards. A7iiso2ms, Templeton, which Dana places in his subfamily, Isapinse, 

 is doubtless identical with the later genus, Sunampldtoe, but the name Anisopus was 

 preoccupied. In his notes Dana observes that Glauconome of Kroyer has the hands and 

 antenme, and apjiarently the other characters of Unrinla, Say ; to that genus it has in fact 

 since been united by S. I. Smith. He also remarks that Bellia of C. Spence Bate (afterwards 

 named Stilcator) falls to Lepidaetylis, Say. 



Among the Hyperidw, the genus Lesfrigimns, M.-Edw., is now generally considered to l)elong to 

 Hj/peria, Latr., though Streets keeps it distinct. Dana gives two genera, distinguished 

 from one another and from Hyperia by differences in the gnathopods, viz., Metoeoux, 

 Kroyer, and Tauria, Dana. These two Boeck unites as completely synonymous under the 

 name Tauria, Meloerus, though the older, being preoccupied ; but Bovallius, 1886, considers 



