502 THE VOYAGE OF H.M.S. CHALLENGER. 



second gnatliopod to the fifth perfeopod lamellate appendages are present, homologous 

 according to their position and structure to the lamellae of the female brood-pouch. 



In copulation the considerably smaller male attaches itself with its subcheliform gnathopods to 

 the back of the fifth or sixth person-segment of the female so that its body forms almost a 

 right angle with that of the female. Then it bends its body in an arc towards the 

 abdominal surface of the female, the point of its tail remaining at a good distance off from 

 her. Spasmodic movements are made by the male from time to time. As a rule two 

 suitors attach themselves at the same time to the female. The brood-pouch of the female 

 at tliis period appears always to be filled with eggs. 



Goplana polonica generally progresses with an upright walk, and even climbs the smooth walls of 

 a glass aquarium. It swims on its back, but not with facility ; at the bottom of the water 

 it hops about in an agile manner. 



Gammarus amhulans, Eriedrich Miiller, is a near relative of this fresh-water species, and is 

 therefore renamed Goplana amhulans. It may well, I think, be questioned whether 

 Goplana polonica is more than the adult of Miiller's species. 



1879. Weze^niowski, August. 



Vorlaufige Mittlieilungen liber einige Amphipodeu. Zoologischer Anzeiger, 

 II. Jahrg. 1879. pp. 322-325, 348-351. 



" Lada Chatuhi-Askii" is described, a new genus and species from shore-pools in the Gulf of Chin- 

 bote, Peru. It is distinguished from the hitherto described species of Melifa by the absence 

 in the male of a finger on the first gnathopods, and by the peculiar structure of the hand, in 

 which the front and upper edge forms a short, thick, hook- formed, downward-curved process. 

 The finger in the second gnathopods closes against the inner sm-face of the hand, as is the 

 case with Melita palmata, Leach, and the Brazilian species, Melifa messalina, F. Miiller, 

 and Melita insatiabilis, F. Miiller. The author is rather doubtful whether to insist on a 

 new genus for his species, or to regard it as a subgenus of Melita, in close relationship with 

 the species just mentioned. 



Lada in the Slav mythology represents the goddess of love. 



The females are distinguished from the males by shorter antenna;, differently formed hands of the 

 gnathopods, the first not being fingerless, and by a hooked process on the antero-inferior 

 edge of the coxa of the fourth perseopod. It is remarked that a similar process in Melita 

 pialmata is wrongly attributed by Boeck to the male instead of the female. 



" Mai7-a Miersi" a new species collected by Herr J. Stolzman together with Hyale stolzmani and 

 Lada chatnhiAsIm, belongs to the division of the genus Mmra which is made by Sp. Bate 

 to form a separate genus Megamoera. The differences between the two appear so slight that 

 Wrzesniowski follows Heller and Boeck in re-uniting them. 



Callisoma Branicldi, a new species briefly described by Professor Wrzesniowski in 1874, is here 

 compared with Calliisoma kripyeri, Bruzelius. The latter species is stated to have, in common 

 with Callisoma hranickii, Callisoma crenata and Callisoma Jwpei, on the back of the fourth 

 pleon-segment a saddle-shaped depression, the existence of which is not noticed by 

 Bruzelius, and expressly denied by Boeck. The distinctions given between Callisoma 

 hranickii and Callisoma kr^yeri refer to measurements of the eyes, antennte and hand of 

 first gnathopods, to the number of joints in the flagella of the upper antennas, and to the 

 armature of the inner rim of the finger of the first gnathopod. To my mind they together 

 barely amount to the value of specific difference. In regard to the saddle-shaped depression 

 on the fourth pleon-segment, it may be noted that this is extremely common among the 

 Amphipoda, but that, even in species which have the character well developed, it is often 



