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



have been called in question. In a note to p. 41 Professor Sars says that in some males of 

 the genus Tanais the eyes are not only pedunculate (pedicell(5s) but even mobile. This 

 statement, to say the least, requires confirmation. In regard to the apparatus for the 

 circulation of the blood, Delage observes that, while Sars is the first who clearly pointed out 

 the existence of a posterior aorta with definite walls, he reproduces the old mistake of 

 attributing to the heart six, instead of three, pairs of lateral slits (valvules) ; nor does he 

 recognise the delicate walls which more or less confine the currents of the blood. In 

 regard to the species Gammarus negledus, which Sars describes with so much valuable 

 detail, Fr. Meiaert inclines to believe that it should not be separated from Gammarus 

 jmlex, auctoTum, the difi"erences being at best minute, and these capable of being bridged 

 over by intermediate examples. If the species stands, Meinert thinks it should retain the 

 name Gammarus lacustris, which Sars gave it in 1863. For altering this Sars gives the 

 insufficient reason that he had met with a casual reference in Nilsson's " Skandinavisk 

 Fauna," tome 4, page 420, to a species named in parenthesis " (Gammarus neglectus 

 Lilljeborg)," on which the trout, var. Salmo 2mndatus, fatten in the Scandinavian 

 mountain-tarns. It is certainly an error to suppose, as Sars appears to do on the authority 

 of Hosius, that Gammarus pulex is only found in very rapid rivers. 



On page 59, under the heading Organes excreteurs, Sars observes " Comme organes excr^teurs at 

 avant tout urinaires, correspondant aux vaisseaux de Malpighi des insectes, on doit indubi- 

 tablement considerer les 2 minces appendices cyliudriques (pi. 5, fig. 25 p.), qui 

 debouchent en haut dans I'iutestin k la naissance du rectum. Places I'un tout centre I'autre 

 et centre la face dorsale de I'intestin, ces appendices pentStrent profondemeut, chez les 

 individus adultes, avec leurs bouts obtusement arrondis dans le dernier segment thoracique. 

 .... On doit sans doute encore faire entrer dans cette categoric un canal flexueux en 

 forme de fronde, de structure glanduleuse, qui se trouve dans le premier article fortement 

 tumefie des antennes inferieures et d(5bonche sur la poiute du proces conique que le 2'' 

 article envoie en bas, la soi-disant c'pine olfactoire." The reader therefore must not be led 

 astray by the references to the " olfactory spines " on page 48, and in the descriptions of 

 pi. iv. fig. 21 and pi. vi. fig. 27. A further safeguard is supplied on page 62, where 

 Professor Sars says, " Le sens olfadif on le sens qui chez les crustaces semble s'en rapprocher 

 le plus, est, comme chez le genre Mysis, restreint a la tigelle exterieure des antennes 

 sup^rieures; chacune de ses articulations porte generalement au bout, dans le bord superieur, un 

 appendice cylindrique tr^s petit, correspondant exactement dans sa structure aux papiUes 

 appelees olfactoires des d^capodes." As to the analogy of the urinary organs first mentioned 

 with the Malpighian tubes of insects, see Note on Spencer, 1885. 



Of the pleopods Sars figures and describes the peculiar spines and special setse {k bout 

 bifurqut), which have either escaped the notice of authors in general or not been thought 

 worthy of attention. 



The other Amphipods described in this work are Pallasea cancelloides, Gerstfeldt, var. quadri- 

 spinosa, Esmark ; Gammaracanthus loricatus, Sabine, var. lacustris; Fontojporda ajinis, 

 Lindstrcim, said to come very close to Pontoporeia femorata, Kr0yer. 



1868. Bate and Westwood. 



A history of the British Sessile-eyed Crustacea, Part XXII. and Part XXIII. 



December 31, 1868. pp. 497-536, and Introduction, signed (C. S. B.), j)p. iii.-lvi. 



London. 



The gnathopods of Orchestia hrevidigitata, n. s., from Banff are figured and described. The 

 length is given as about eight-twentieths of an inch, the colour a light olive-green. It is 



