ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 30: J 



pares the new form with G. urna and G. rugosa, and has some remarks 

 on the Gyrocotyle in general. Thus he shows reason for regarding the 

 sucker end as anterior. 



North American Trematodes.* — H. S. Pratt has published another 

 of the useful synopses of North American Invertebrates. It deals with 

 the digenetic forms, — Aspidocotylea and Malacotylea, and gives the 

 usual diagnostic keys. 



Sub-CEsophageal Ganglion of Liver-Fluke.t — E. Mareinowski finds 

 that there are small ganglion-cells around the whole of the pharynx and 

 cesophagus. There is too little concentration or definite localisation 

 to justify such a term as peri-pharyngeal or peri-cesophageal ganglion. 

 A comparison with the sub-cesophageal ganglia of Annelids cannot be 

 more than approximate. 



Peculiar Fluke.J — H. L. Osborn describes, as Cryptogonimus chili 



g. et sp. n., a peculiar fluke found in the stomach and intestine of the 

 black bass (Micropterus dolomieu) and other fresh-water fishes. The 

 worms appear to the naked eye as extremely minute black spots in the 

 yellowish chyle of the host. The black colour is due to numerous ova 

 in the coils of the uterus at the extreme posterior end. The oral sucker 

 is relatively large, and there are two ventral suckers, one directly behind 

 the other, and a little dorsal to it, both in the middle line. The only 

 other Distomid known having two ventral suckers is Podocotyh fracttnn 

 Rud. The genital opening lies between the two suckers, which are 

 contained within a sheath formed as a depression of the ventral surface, 

 and having a lip furnished with a circular sphincter muscle. 



Incertae Sedis. 



Re-discovery of Cephalodiscus M'Intosh.§ — K. A. Anderson on 

 the Swedish Antarctic Expedition has been fortunate enough to find in 

 four different localities specimens of this rare animal. It was previously 

 obtained by the 'Challenger' (1876) in the Magellan Straits, and 

 Anderson has the honour of finding it for the second time. It was 

 got off Cape Seymour at 150 metres, south of the Falklands at 1!>7 

 metres, at the Burdwoodbank at 150 metres, and in the Beagle Channel 

 at 80—235 metres. In each of these four dredgings several colonics 

 were got. It seems to be rather local than very rare. Some small 

 larvae were seen, in a planula-like stage. The animal seems to have its. 

 reproductive period in spring. 



Echinoderma. 



Antarctic Echinoderms.|| — F. Jeffrey Bell reports on a collection 

 made during the voyage of the ' Southern Cross.' He establishes two 

 new genera of Ophiuroids, — Ophiosteira, with five large keel-like plates 

 on the dorsal surface of the disc, each interposed between two radial 



* Amer. Natural., xxxvi. (1902) pp. 953-71 (130 figs.). 

 t Jeuaische Zeitschr. f. Naturwiss., xxxvii. (1903) pp. 544-50 (1 pi.). 

 X Zool. Anzeig., xxvi. (1903) pp. 315-8 (2 figs.). § Tom. cit, pp. 368-9. 



|| Rep. Collections in Antarctic Regions during Voyage of 'Southern Cros,' 

 London, 1902, pp. 214-20 (3 pis.). See Zool. Centralbl., x. (1903) p. 73. 



X 2 



