34 SUMMARY OF CURRENT RESEARCHES RELATING TO 



New Amphipods from Eastern Tropical Pacific.*— A. Woltereck 

 describes a number of interesting forms, e.g. Ghuneola paradoxa g. et 

 sp. n., Mimonecteola diomedese g. et sp. n., and Microphasma agassizi 

 g. et sp. n. He also discusses the " reflector-organs " of Scypholanceola, 

 which he regards as adaptations to reflect the luminosity of other creatures 

 or faint gleams from above. 



Terrestrial Species of Talitrus from Victoria.f— 0. A. Sayce 

 describes 7\ kershawi, sp. n., and gives a fuller description than hereto- 

 fore of T. sylvestris, which ranges from the seaboard to the tops of the 

 highest mountains. The two species are often together. 



New Species of Leperditia.J — Frederick Chapman describes a new 

 Ostracod, Leperddia shear sbii sp. n., in shaly micaceous mudstone 

 (Silurian) from Yass, New South Wales, the first species of this genus 

 to be described for Australia. 



Double Nauplius.§— E. Chatton describes a thoroughly double 

 nauplius in Ophioseides joubini, parasite of Microcosmus sabatieri, a rare 

 occurrence among Crustaceans. Double embryos of the lobster have 

 been described. 



Notes on Rhizocephala.||— Max Kollmann found Farthmopea on 



Galathea dkpersa, and notes that in the nauplius there is a closed 

 median endodermic vesicle. There is usually no trace of endoderm in 

 the nauplius of Rhizocephala. 



Kollmann also found Lenseodiscus yalathese on Galathea intermedia, 

 and points out that it has little influence on its host. 



He calls attention to cases of several specimens of Suceidina on one 

 crab, and from the way in which the roots unite in one system the 

 author coucludes that there is a sort of " polyembryony," one embryo 

 Driving rise to several " individuals." 



n l,i "& 



Generation-cycles in Cladocera.lf — L. Keilhack maintains that the 

 maximum number of parthenogenetic generations is hereditarily deter- 

 mined for each species. The external conditions, which are never quite 

 uniform, supply the stimulus to the onset of the sexual period, and may 

 do so before the normal time. In artificial conditions with uniformity 

 of temperature and nutrition, pathological phenomena set in after the 

 normal maximum of parthenogenetic generations. 



Rudimentary Antennary Gland in Cladocera.** — V. H. Langhans 

 notes that the glands demonstrated by Fischel, by intra-vitam neutral- 



* Bull. Mus. Cornp. Zool., Harvard, Hi. (1909) pp. 145-68 (8 pis.). 



t Proc. R. Soc. Victoria, xxii. (1909) pp. 29-34 (2 pis.). 



t Tom. cit., pp. 1-5 (2 pis.). 



S C.R. Soc. Biol. Paris, lxvii. (1909) pp. 482-4 (1 fig.). 



|| Arch. Zool. Exper., ser. 5, i. (1909) Notes et Revue, No. 2, pp. xhu.-xlix. 



(2 figs ) 



f Internat. Rev. Hydrobiol., ii. (1909) pp. 238-40. See also Zool. Zentralbl., 



xvi. (1909) pp. 624-5. 



** Interuat. Rev. Hydrobiol., ii. (1909) pp. 182-5 (1 pi.). See also Zool. Zen- 

 tralbl., xvi. (1909) p. 626. 



