414 M. A. Boeck on the Amphipoda 



JEgina, Kroyer. — Kroyer characterizes this genus by the 

 three-jointed palpi of the mandibles, the two-jointed abdomen 

 with two pairs -of appendages, of which the first pair are two- 

 jointed, the second one-jointed. Dana refers to the genus 

 some species which differ from the typical longicornis in the 

 formation of the abdomen, and he thinks that this is of little 

 systematic importance. But as I have found two new species 

 which agree perfectly with Kroyer's characters of sEgina, and 

 also a species which resembles these in having palpi on the 

 mandibles, but in which the abdomen is constructed as in the 

 genus Caprella, I think that Dana's species must be trans- 

 ferred from jEgina to a new genus, of which this species of 

 mine is the type. To this genus I have given the name of 

 JEginella. The new species of the genus jEgina, Ki\, 

 are: — 



2E. (Caprella) echinata, Esmark. — This species, which was 

 found by Professors Rasch and Boeck at Beian and Sondmor, 

 is distinguished by its large size and spinose body. The 

 superior antennas are very long, and reach to the beginning of 

 the sixth segment. The first joint of the peduncle is of about 

 the length of the second thoracic segment, the second joint is 

 about as long as the first, and the third is shorter than this, 

 but longer than the first ; all these joints are closely beset 

 with larger and smaller tubercles. The flagellum is some- 

 what longer than the second joint of the peduncle, and con- 

 sists of eighteen joints, which gradually become longer and 

 thinner. The inferior antennas do not reach to the end of the 

 second joint of the peduncle of the superior. In these (as in 

 the other Caprellidea) the first two joints of the peduncle of 

 the inferior antennas are so closely united that they look like 

 one joint, which I have called the first. The third joint is 

 shorter but thicker than the fourth. The flagellum is two- 

 jointed. On these joints there are some small tubercles ; and 

 beneath they are furnished with short and close hairs. The 

 mandibular palpi are rather shorter than imE. longicornis ,Kr. 

 The first pair of maxillae are strong. I have not found the 

 inner lamella in this any more than in any other species of 

 this subtribe ; and as Kroyer neither mentions nor figures any 

 such organ, I cannot but think that it is constantly deficient. 

 The fourth joint or claw in the palpi of the maxillipedes is 

 much longer and stronger than in jE. longicornis. The first 

 pair of legs are small ; the fourth joint is produced downwards 

 behind into an obtuse hairy process ; and the fifth joint or 

 hand is elongate-ovate, with its hinder margin furnished with 

 small spines, which also occur on all the other joints. The 

 second pair of legs are much larger. The first joint has a 



