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



is, however, a deep, triangular sinus between the third and fourth abdominal segments, 

 the latter being strongly protuberant, projecting over the very small fifth segment. The 

 second abdominal segment is subtruncate below, and has a deep semicircular sinus on the 

 anterior lateral margin, near its lower extremity. Eami of the last pair of caudal stylets 

 shorter than those of the second pair, and telson rather elongated and slit in two down the 

 middle. Length about one-third of an inch. It resembles an English species of which a 

 figure has been privately circulated by C Spence Bate, Esq., under the name of Lydanassa 

 Chausica, M.-Edw. Dredged in deep water by Lieut. White." 



The Lysianassa chausica here referred to was afterwards identified by Spence Bate with 

 Lysianassa longicornis, Lucas, as to which see Note on G. O. Sars, 1882. 



Gammarus suhtener has the " first, second and third joints of the abdomen armed above with a 

 sharp central spine on the posterior margin, and with four or five minute spines, or sharp 

 comb-like teeth on each side of the middle spine, the margin bearing these latter spines 

 being a little concave. At the corresponding part of the fourth and fifth abdominal 

 segments, there are also two or three spines similar to the central spine of the other 

 segments though not quite so large." Stimpson thinks it no doubt closely allied to Gam- 

 marus longicauda, Brandt, a spedes which Spence Bate renames Megam.cera longicauda, 

 and inclines to identify with Gammarus dentatus, Kr0yer. Amphithonotus septemdentatus 

 is "strongly compressed and carinated, like A. carinata." AmphUlionotus occidentalis 

 is " closely allied to the Arctic A. panopla, Kr., and the east coast species, A. cataphr actus, 

 Stm., but difi'ering from both in being more elongated, having less height and breadth." 

 The generic name Amphithonotus, as already observed, is inadmissible, having lapsed as a 

 synonym of Dexamine before it was adopted by Stimpson. Of the species which Stimpson 

 here mentions for the sake of comparison, Amphithoe carinata, Kr0yer, is now called Atylus 

 carinatus, Fabr.; Ainphitho'e pmnopila, Kroyer, is called Plevstes piamyplus, and Amphithonotus 

 cataphractus, Stimpson, is called Rhachatropis eataphracta. In Ampelisca pugetica " the 

 last three joints of the abdomen are separated from the preceding ones by a deep notch, 

 and project into two sharp teeth." 



1864. Zaddach, Ernst Gustav, born 1817, died 1881. 



Ein Amphipode im Bernstein, entdeckt durch Herrn Pfarrer von Duisburg und 

 beschrieben von G. Zaddach. Taf. 1. 12 pages. Schriften der koniglicben 

 physikaliscb-okonomisclien Gesellschaft. 5. Jahrg. Konigsberg. 1864. 



To the existing fauna of the neighbourhood in which this fossil was found Zaddach ascribes seven 

 species of Amphipods, viz., the fresh- water " Gammarus fluviatilis, Raj.," four species which 

 he dredged in the Bay of Dantzig, at some distance from the coast, and only two, he says, 

 which live near the coast, Gammarus locusta, Mont., and Talitrus saltator, Klein. Of 

 these he says that they frequently let themselves be thrown by the' waves on to the strand, 

 where, by help of their styliform uropods, they make powerful leaps, or with great dexterity 

 bury themselves in the wet sand in order to be washed back into the water by the next 

 wave, or gather round the remains of a dead fish for a meal, but never go beyond the 

 narrow selvage of shore which is regularly washed to a greater or smaller extent by the 

 waves. In these remarks Zaddach can scarcely be accurate. The sand-hopper, Talitrus 

 (saltator) locusta, lives at the edge of high water-mark, and may follow down the ebb and 

 retreat before the flow of the tide, but does not surely play with the waves in the manner 

 described. The dexterous delving in the sand seems also more appropriate to species of 

 Urothoe, Lepidactylis and Eur y dice than to the sliddering Gammarus locusta. 



