330 SUMMARY OF ci;kk?:nt researches relating to 



Ccelentera. 



Structure of Favia.— George Matthai {Brit. Antarctic ^' Terra 

 Nova " Exped., Zoolof/i/, 1919, 5, 69-9(1, 4 pis., 2 figs.). In Astr^id^e 

 the formation of colonies takes place by extra-tentacular and intra- 

 tentacular liuddintj— i.e.by the formation of ne\Ystomod8ea, hence of buds, 

 outside or inside the tentacular rings of older polyps. In both cases new 

 stomodiea arise afresh in diverticula by invagination of the oral disc or 

 bj union of the margins of the brv;ader mesenteries, without involving 

 the longitudinal fission of existing stomodaea. In Favia colony-formation 

 is mainly by intra-tentacular budding, but extra-tentacular budding 

 unaccompanied by bilateral and hexameral symmetry occurs at the 

 growing edges of colonies. A description is given of the corallum and 

 polyps of Favia conferta, which is compared in detail with F. frag urn. A 

 survey is taken of the Atlantic species. J. A. T. 



West African Antipatharians. — H.jalmar Broch (Antipatharia, 

 1920, 18-22, 2 figs.). Little is known of Antipatharians from West 

 African waters. A description is given of Antipathes (?) spinescens 

 Gray and Sticfiopathes (?) occidentalis (Gray) Brook. The dubiety 

 refers to the absence of polyps. Attention is directed to fragments of 

 a very large form with a sinuous main axis {Ih cm. in diameter), few 

 lateral branches, and almost vestigial spines. The form suggests Eoule's 

 Antipathes grimaldii. J. A. T. 



Leptogorg-ia irramosa (Grieg). — Arvid R. Molander {Arlciv f. 

 ZooL, 1919, 12, No. 5, 1-7, 2 figs.). A revision of this species 

 ( = Gorgonia pinnata). The main stem is not prominent ; the branch- 

 ing is irregular ; the polyps are about 2 mm. long, and irregularly or 

 alternatively disposed on the stem and branches ; the calyx is usually 

 distinct and about 1 mm. high ; the coenenchyma includes spindles and 

 double stars; the polyps show spindles which form eight longitudinal 

 douljle rows near the base of the tentacles. The description and 

 photograph given do not convince the recorder that L. irramosa is a 

 Leptogorgia at all, for members of this genus are marked by minute 

 double spindles and the verruca; are typically low and inconspicuous. 

 The suggestion that Stenogorgia and Call iateph anus may be included in 

 tlie Liciius Leptogorgia does not seem to the recorder to be warranted. 



J. A. T. 



Hydroids of Ingolf Expedition.— Hjal^iar Brock (Danish Ingolf 

 Expedition, 1918, 5, l-2<ir), 1 pi., 1 chart, 95 figs.). The thecaphore 

 hydroids fall into four main groups or series of families, the most 

 primitive being the Hebellina with conical proboscis and homogeneous 

 gastral endodertn. From this are derived the Haleciinaand Sertulariina, 

 with the .gastral endoderm not homogeneous. An exceptional position 

 is that of the Proboscoida with clul)-shaped proboscis. The author 

 gives an account of a large collection including two new genera, 

 Nemertesia and Nematocarpus, and some new species. To the athecate 

 forms previously dealt with is added Branchiocerianthus reniformis sp. n. 

 A zoogeographical survey is taken of the Hydroid Fauna of the North 



