1652 THE VOYAGE OF H.M.S. CHALLENGER. 



excretory ducts of the pleon-cells having their openings along the convex margin of the outer 

 ramus of the first uropods. 



In all the Ampeliscids of the Gulf of Naples, Professor Delia Valle says, the number of the eyes 

 is four, while the Ampeliscx besides the two principal pairs have a third pair of rudimentary 

 eyes. In a vertical section of the eye of Ampelisca the following strata are distinguished: — 

 (1) the lenticular cornea ; (2) the hypodermis with elongate or short cells ; (3) external rhab- 

 doms (bastoncelli); (4) crystalline cones ; (5) internal rhabdoms ; (6) reticulated membrane ; 

 (7) retinal cells. All the eye is surrounded in its distal part by a fine capsule of connective 

 tissue, across which pass the fibres of the optic nerve, which before entering the ganglion 

 form a true chiasma. 



Between the eyes of Ampelisca and Haploops the principal differences are said to be, (1) the 

 hypodermis in Ampelisca in the periphery of the cornea has some very long cells, but in 

 Haploops only short ones ; (2) in Haploops true crystalline cones are wanting, or rather these 

 are represented by the dicotyledonous body [previously described], which is without doubt 

 the union of the crystallogenous cells (nuclei of Semper); (3) the retinal cells are less elongate 

 in Haploops than in Ampelisca, and do not as in Ampelisca segregate the internal rhabdom. 



1888. GuERNE, J. DE. 



Excursions Zoologiques dans les lies cle Fayal et de San Miguel (Acores). Paris, 



1888. 



At page 46, " Orchestia Chevreuxi, nov. sp.," is described. 



1888. GUERNE, J. DE. 



Eemarques au sujet de Y Orchestia Clievreuxi et de l'adaptation des Amphipodes 

 a la vie terrestie. Extrait du Bulletin de la Societe Zoologique de France, t. xiii, 

 seance du 28 fevrier 1888. 8 pages. 



The suggestion having been made that Orchestia chevreuxi might be the same as Orchestia 

 littorea, M. de Guerne here discusses the differences in detail, and besides giving 

 comparative figures of various parts, supplies a fresh Latin definition, that which had 

 previously appeared having suffered from errors of the press ; it is as follows : — 



" Femina.- — Antennx superiores paulo ultra articnlum pedunculi penultimum antennarum 

 inferiorum porrectss. Pedes 2 di paris articulo S"° aculeis 2 armato, carpo elongato ; pal ex 

 5" paris perbreves ; pedes 7 mi paris et pedes saltatcrrii 1"" et 2** paris valde elongati. 

 Telson breve, ovatum, emarginatum. Animal roseo-violacescens. Mas ignotus. Longit. 

 15 mm." 



M. de Guerne observes that, with the exception of Orchestia cavimana, Hoek, all the terrestrial 

 Orchestiee are insular forms. 



1888. Pereyaslawzewa, S., and Rossiiskaya, M. 



Etudes sur le developpement des Amphipodes. Partie I. Le developpement 

 de Gammarus poecilurus, Rathke. Moscow, Bull. Soc. Nat., 1888. 38 pages, 

 4 plates. 



This work is mentioned in Friedlander's Natural Novitates for August, 1888. 



