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



Spencer, 1885. In regard to the concretions found in the gland-tubes of Orehesfia he is 

 also corroborated by Spencer, Tyho found such in Talitrus locusta, though apparently of a 

 somewhat different chemical composition. 

 A section is devoted to the rectum of Orchestia, and another to a comparison of its branchiae 

 with those of other Crevettina. A further section discusses the production of ova in the 

 testes of Orchestia. The curious fact is affirmed that the males of Orchestia produce, not, 

 as the Cymothoidse, at one time spermatozoa and at another time ova, but both sexual 

 products in parallel development at one and the same time, although the eggs are never 

 laid, and there is no brood-pouch for hatching them if they were. 

 In the section headed " Beobachtungen iiber die Crevettinenia,a.na. des Triester Hafens," under 

 Orchestia cariviana, Heller, Nebeski remarks that this, which was originally regarded by 

 Heller as a fresh-water form, must really be considered, like Talitrus, a land-Amphipod, since 

 it soon dies whether placed in fresh or salt water. 

 In the Gammaridffi, subfamily Stegocephalinaj, Nebeski gives Protjolium tergestinum, n. s. 

 (fig. 39), " Artcharaktere : 3. Glied der ISIaxillarfiisse bedeutend verlangert. 6. Glied des 

 ersten Fusspaares langHch viereckig, vorne abgestutzt, 4. und 5. Glied vorue in nach unten 

 Torspringende Lappen ausgezogen." It is said to be very near Proholiuni monoculoides, nor 

 am I inclined to separate it from that species (Stcnothoe monoculoides, Montagu), even as a 

 variety. The figures given by Nebeski seem to me to agi-ee with those given by Boeck 

 with even more than the usual exactness to be found between authors figuring quite 

 independently of one another. 

 In the subfamily Gammarinse, under Dexamine, Loach, he notices the large comparative size of 

 the first three pleon-segments as well in this genus as in Atylus, Pherusa and Calliope, 

 giving room for powerful muscles to work the relatively large pleopoda of these capital 

 swimmers. He gives Dexamine dolichonyx, n. s. (fig. 40), " Artcharaktere : 1. Glied der 

 oberen Antennen kurz und gedrungen, ohne Zahnfortsatz ; das breite Handglied des 

 zweiten Gnathopodenpaares beim Mannchen am Oberrande tief ausgebuchtet : Klauen 

 der Thoracalbeine sehr lang ; das 2., 3. und 4. Segment des Abdomens am dorsalen 

 Hiuterrande in einem spitzen Zahn ausgezogen." The deep narrow cavity in the back of 

 the hand of the second gnathopod was only found in the two male specimens, not in the 

 females. A specimen of this curious species, from the Clyde, sent me by Mr. David 

 Robertson, of Glasgow, shows in the perieopods a short hand and wrist preceded by a very 

 long joint, which is characteristic of Boeck's genus Tritxta. The species should, I think, 

 be named Tritxtcc dolichonyx. The branehire have lateral dilatations. 

 Nebeski gives "Pherusa Mspinosa [ = Atylus hispinosus Sp. B.)," with the remark that "this 

 species, as long as the artificial separation of the genera Pherusa and Atylus is maintained, 

 must be referred to Pherusa, as it possesses a completely lanceolate telson, which is 

 precisely the character that differentiates Pherusa from Atylus." He seems unaware that 

 Boeck has already named it Halirages hispinosus. 

 " Gammarus Edward.si," Sp. Bate, is considered by Nebeski as undoubtedly not more than a 



variety of Gammarus locusta. 

 In the Corophiida», subfamily Podocerinoe, he discusses the connection of the telson and the last 

 uropods with the mode of life. He thinks that Aora and Stimpsonia will probably have 

 to be transferred to the Podocerinee, in which Heller has already placed Microdeutopius. 

 (It is, indeed, quite certain that those three genera cannot stand in different subfamilies.) 

 Very near to Amphithoe pe^iiciUuta, Costa, which is among the commonest Amphipods of 

 Trieste Harbour, he places Amphithoe lonyicornis and Amphithoe largimana, placed by 

 Heller in the genus Podocerus because of the uniarticulate secondary fiagellum, although 

 in other respects, Nebeski says, they clearly belong to Amphithoe. The four so-called 

 species of Podocerus, named variegatus, x>elagicus, pulchellus and falcatus, he unites into one 



