REPORT ON THE AMPHIPODA. 339 



to the tliorax a ganglion-pair too many, and in the last peraeon-segment figured a ganglion in 

 a place, where none such exists. The habitation which the female Phronima sedentaria 

 occupies is discussecL 



Phronima elongata, n. s., Taf. xix. Figs. 2, 3, 7, is described. This subsequently became the 

 type for a new genus as Phronhnella elongata. 



Phronima sedentaria, Taf. xix. Figs. 1, 4, 5, 6, is described, and the suggestion made that 

 Phronima atlantica of Gu6rin and M.-Ed wards {Phronima custos, Risso) is the not completely 

 adult form of Phronima sedentaria. With reference to the sort of metamorphosis which 

 Pagenstecher had shown that this species undergoes as it advances in age, Glaus states that 

 he has noticed similar facts in regard to Phronima elongata, in which, he says, the most 

 interesting peculiarity is " die Anwesenheit zweier einfacher stummelfcirmiger Fiihlhorner 

 unterhalb der grcisseren 2gliedrigen Antennen (Fig. 7.). Die junge Ph. elongata hat also 

 wie die iichten Hyperinen zwei Antennenpaare und es ist das obere Paar, welches in der 

 spateren Zustanden persistirt." 



1862. ClAUS, C. 



Ueber Plironima elongata Cls. Hierzu Tafel VI. (Fig. 6-11). Wiirzburger natur- 

 wissenschaftliclie Zeitschrift. III. Band. 18G2. , 



Glaus gives a further description, believing that he has found the male form. This in 1872 he 

 decided to be "das noch junge Mannchen vor Eintritt der Geschlechtreife und vor der 

 Entfaltung siimmtlicher Antennenglieder." He corrects an oversight in the previous account, 

 where the fourth pair of feet, instead of the third, was stated to be the longest. Of the 

 second uropods, he says, " das mittlere Paar der 3 Springfiisse sehen wir an dera 

 ausgebildeten Weibchen voUstandig hinwegfallen, bei dem Mannchen dagegen entwickelt 

 sicli dasselbe jederseits zu einem engen und kurzen Schlauche, der an seiner Spitze einfach 

 bleibt und kaum iiber das letzte Leibes-segment hinaus ragt. Die hakenformige Anlage 

 dieser Extremitat, wie wir sie in den 4-5 Mm. langen Jugend-stadien antretfen, wiirde 

 demnach in beiden Geschlechtern eine versehiedene Veriinderung im Laufe des weiteren 

 "Wachsthums erleiden." He figures and describes the mouth-organs. 



1862. Costa, Achille. 



Osservazionc sidgenere Lysianassa e descrizione di una novella specie. Annuario 

 del Museo zoologico della E. Universita di Napoli per Achille Costa. Anno 1. 

 Napoli, 1862. pp. 79-82. 



In a species discovered by Costa the lower antennae are furnished with a slender flagellum as 

 long as the body. This seemed to him a difference of almost generic value, but the rest 

 of the organization was so perfectly identical with that of Lysianassa that he was content to 

 let it rank as a specific distinction. It is now known to be only a sexual character of the 

 adult male. He names the species Lysianassa fllicornis. The Latin description of it is : — 

 " L. aiitennis siqjerioribus corporis quarto brevioribus, jyedunculi articulo j^i'i'ino valde 

 incrassato, infra spina acuta terminate'; inferioribus seta gracillima corporis longitudinem 

 lequante ; piedibus primi pans mann elongato-conica, imguiculo validiusculo preedita, secundi 

 paris lojigioribus, grant ioribus, manu ovato-rotundato, setis terminata ; pedibus spuriis 

 abdominalibus xqtie terminatis. Longit. corp. millim. 10." Tav. II, fig. 18-23. 



