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



1848. MiJLLER, FrIEDRICH. 



Orchestia Euchore unci C4ryphus, neue Arten aus der Ostsee, beschrieben vou 

 Dr. Friedrich Miiller. (HierzuTaf. IV.) Archiv fiir Naturgeschichte. Vierzehnter 

 Jahrgang. Erster Band. Berlin, 1848. 



Miiller notices that the genera Talitrus and Orchestia belong to the wanner seas, and seem to be 

 wanting in the arctic waters, tlie proper home of the typical Gammarina. From this point 

 of view lie thinks the discovery of two new species from the Baltic not without interest. 

 He does not consider the presence of the large second hands in Orchestia sufficient for a 

 generic distinction from Talitrus, while in the two new species, as in Orchestia platensis, 

 Kr0yer, the males belong to Orchestia, the females to Talitrus. Orchestia euchore is fully 

 described and figured, but it is, as Boeck says, not to be distinguished from Orchestin 

 f/ammarelhis. j\lUller says that the mandibles are without any trace of a palp, as if he had 

 given special attention to that point. He recognizes the great likeness between Orchestia 

 f/ryphus and Orchestia deshayesii, Audouin. In conclusion he says, " Orchestia jilaiensix, 

 Euclwre et Gryphus inter se conveniunt : 



" Antennis sup. capitis longitudinem baud aut vix superantibus ; mandibulis palpi ne vestigio 

 quidem gaudentibus : maxillarum p)aris 1' lamina interna angusta setis pinnatis curvatis 

 duabus instructa ; palpi jieduni ma.rillarium articulo ultimo brevi lato rotundato ; pedilnis 

 ir paris in $ manu valida instructis, in ? debilibus, ungue exiguo artieuli V foliaceo- 

 dilatati, cujus margini anteriori inseritur, apiccni haud superante proeditis; branchiis T paris 

 angustis elougatis flexuosis ; jiedibus saltaturiis paris ultimi exiguis conicis, stylo terminali 

 unico donatis ; lamina caudali unica crassiuscula, spinis ornata. 



" Diflerunt : 



" Orchestia platensis, Kr. Antennis superiorihus caput longitudine Eequantibus aut vix 

 superantibus ; antennis inf. vix teftiam corporis partem longitudine sequantibus, pedunculo 

 flagelhim 14 articulatum parum escedente ; vculis ellipticis ; primi pedis articulo quinto 

 apicem versus in i dilatato, haud dilatato in ? , ungue vaUdo inermi ; manu pedis secundi 

 in (J lata ovali ; pedis septimi articulo quarto in <^ incrassato, in J gracili, lamina caudali 

 truncata ; longitudine linearum 6. 



" Orchestia Euchore F. Miill. Antennis superiorihus caput, inferiorihus tertiam corporis partem, 

 harum pedunculo flagellum 18 articulatum longitudine sequantibus ; oculis rotundis; prind 

 pedis articulo quinto apicem versus in cJ dilatato, haud dilatato in J , ungue valido spiimlis 

 duabus in margine interiore armato ; manu j^edis secundi in ^ ovali ; pedis septimi articulo 

 quarto in <J incrassato, in ? gracili ; lamina caudali emarginata ; long. 5'". 



" Orchestia Gryphus F. Miill. Antennis sup. capite brevioribus ; inferiorihus in ^ dimidiam, in 9 

 quintam (1) corporis partem longitudine ajquantibus, flagello 20 articulate pedunculi 

 dimidiam snbrequante ; rtt7i7/.s rotundis ; primi 2}ed is axiicxAo quinto nee m$ , nee in J dilatato, 

 ungue valido spinula unica in margine interiore armato ; manu pedis secundi lata, incisura 

 profunda in ramos duos divisa, anteriorem longiorem latiorem unguigerum, posteriorem 

 acuminatum ; pedis septimi articulo quarto in utroque sexu gracili ; lamina cavdali 

 emarginata ; long. 4'"." 



Another notice, headed " Bemerkungen zu Zaddach's Synopseos Crustaceorum Borussicorum 

 prodromus," states that Leptocheirus pilosus, Zaddach, has in fact a very rudimentary, one- 

 jointed accessory flagellum on the upper antennae, which had escaped the notice of the author 

 of the genus Leptocheirus, Avhen the absence of an accessory flagellum was made part of the 

 generic character. 



