550 SUMMARY OF CURRENT RESEARCHES RELATING TO 



found also in temperate seas ; Eusirus propinquus and Melphidippa 

 macrura have only been recorded before from the more northern 

 waters of Norway ; the ascidiicolous Leucothce, spinicarpa seems to be 

 ubiquitous, and Walker finds no difference between those taken from 

 the ' Discovery's ' winter quarters and those from our own seas and from 

 the tropical seas of Ceylon and the Maldives. Among the peculiar 

 forms may be noted Hyperiopsis australis, belonging to a rare genus, 

 Thawnatelson herdmani, which is the only known Amphipod with its 

 telson set in a vertical plane ; Epimeria macrodonta, with long curved 

 and sharp teeth on the body segments, and Iphimedia hodgsoni so 

 densely clothed with fine spines directed backwards that it has a shaggy 

 appearance. 



Antarctic Species of Nebalia.* — Joh. Thiele finds that all the 

 Leptostraca collected by the ' Discovery ' belong to one species, also 

 obtained by the ' Valdivia ' and the ' Gauss,' namely, Nehalia longicornis 

 magellanica, 



Antarctic Ostracods.t — G. Stewardson Brady found in fifty-seven 

 gatherings made by the ' Discovery ' (in a limited number of small and 

 often similar areas) only nine species of Ostracods. Of these all but 

 two are new, viz. Conchcecia iniiominata, Gypridina glacialis, Philomedes 

 antarctka, and two other species of this genus, Xestoleberis reniformis 

 and LinocheUs vagans g. et sp. n. The new genus is one of the 

 Cytheridffi, and differs from the typical forms in the greatly elongated 

 and thread-like legs of the third pair, and in the abnormally formed 

 copulatory plate of the male. 



Antarctic Cirripeds.| — A. Gruvel finds in the ' Discovery ' collec- 

 tion the following forms : Balanus psittacus, Elminius rugosus, and two 

 new species of Scalpellum. 



Antarctic Decapods.§ — W. T. Caiman describes two species of 

 Decapod Crustacea obtained by the ' Discovery ' within the Antarctic 

 circle, viz. Chorismus antarcticus (= Hippolyte antarctka Pfeffer) and 

 Crangon antarctkiis Pfeffer, both of which were also collected by the 

 German Polar Commission of 18S2-3 at South Georgia. With the 

 exception of Crangon capensis Stimpson, which is very imperfectly 

 known, C. antarctkus is the only species of the genus inhabiting the 

 Southern hemisphere, and is widely separated from all the other species, 

 which are confined to the temperate and (if Sderocrangon be included) 

 the Arctic regions of the Atlantic and Pacific. 



Classification of Decapod Crustaceans. || — L. A. Borradaile makes 

 an important contribution to the taxonomy of the Decapod Ci-usta- 

 ceans. A search for the most primitive group leads, beyond all doubt, 

 to the Pen^idea. From the original Decapod stock, whose nearest 

 descendants are the modern Penseids, the Eeptantia and Caridea must 



* National Antarctic Expedition, iii. (1907). Crustacea, IV., 2 pp., 2 figs, 

 t Tom. cit. Crustacea, V., 9 pp., 3 pis. 

 X Tom. cit. Crustacea, VI., 4 pp., 1 pi. 

 § Op. cit. ii. (1907). Crustacea, I., 7 pp. 

 II Ann. Nat. Hist., xix. (1907) pp. 457-86. 



