ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 59 



(Eleutlieroblastus). Numerous new species are described from the 

 author's very large collection. 



Revision of Palaeozoic Palseechinoidea.* — Mary J. Klem lays 

 emphasis on the amount of variation, e.g. in the different parts of the 

 corona. " Deviations from the pentamerous arrangement are the rule 

 rather than the exception." Many alleged new species are merely 

 variations. The sub-class is divided into three orders : Cystocidaroida, 

 Bothriocidaroida, and Perischoechinoida. Twelve doubtful genera are 

 left unclassified. A synopsis of all the known species is given, and the 

 author has notes on the development of the test-plates individually 

 and of the various areas of the test. 



Ccelentera. 



Reproduction and Variation in Sagartia luciae.f — Gertrude Crotty 

 Davenport gives a full account of her observations on this sea-anemone. 

 Longitudinal division is very common, and may take place in a few 

 hours. Basal fragmentation is probably common in nature. A piece 

 cut off will produce a normal individual with tentacles in from four to 

 seven days. By longitudinal division the stripes are apportioned to the 

 two daughter individuals, 8-4, 5-7, 9-3, and so on. The individuals 

 are always tending by means of regeneration in the direction of twelve 

 stripes and forty-eight r mesenteries. Triglyphic forms occur and are apt 

 to possess more than twelve stripes. By division of the twelve-striped 

 condition or by division before the twelve-striped condition is attained, 

 the mass of individuals may fall short of twelve stripes. 



Anatomy of Madreporaria.J — A. Heicke has investigated some 

 points in the anatomy of Rhodanca lagrenm and Ccrloria sinensis, both 

 from Singapore. In the former the polyps are of the actinian type. 

 On the tentacles are tactile sense-buds. The mesenteries of each polyp 

 bear both types of sex-cells. The characters of the archenteron are 

 analogous to those of the Alcyonaria, especially those of the more 

 highly differentiated genera of the Alcyonacea. The development of 

 the asexual yonng individuals is very similar to that of the polyp from 

 the fertilised egg. In C. sinensis the directive mesenteries are absent, 

 and the number of mesenteries present is not uniform. This is related 

 to the irregular processes of division, which also interfere with the usual 

 multiple-of-six arrangement. 



Medusae from the Devonian. § — F. Kinkelin describes from the 

 middle Devonian Orthoceras-beds near Laurenburg on the Lahn, a 

 fossil Medusa, one of the Discomedusas, referable to Walcott's genus 

 liroolcsella. He names it Brooksella rhenana sp. n., and signalises it as 

 the first medusa from Devonian strata. 



Antarctic Hydroids.|j — Elof Jiiderholm makes a preliminary note 

 on the collection made by the Swedish Antarctic expedition (1901-8). 



* Trans. Acad. Sci. St. Louis, xiv. (1904) pp. 1-98 (6 pis.). 

 + Mark Anniv. Vol., 1903, pp. 137-46(1 pi.). 

 X Arch, fur Naturgeschichte, i. (1904) pp. 253-96 (1 pi.). 

 § Ber. Senckenberg Nat. Gcs., 1903, pp. 89-96 (1 pi.). 

 || Arch. Zool. Expe'r., iii. (1904) Notes et Revue, pp. i-xiv. 



