560 SUMMARY OF CUKKENT RESEARCHES RELATING TO 



glandular cells, and cnidoblasts were found in the endoderm. Testes 

 and ova were found close together on the same mesentery. The ova of 

 L. tkyrsoides (160-200 ju, in diam.) are surrounded by a follicle of 

 endoderm-cells, which forms internally a fine lamella. The spherical 

 testis has a diameter of 160 jx, including the follicle. All the species of 

 Lithophytum seem to have abundant symbiotic AlgaB, but none were found 

 in Dendronephthya. 



Caligorgia flabellum from Port Philip.* — S. J. Hickson notes that 

 what he namedj as Primnoella australasm Gray (obtained at Port Philip) 

 was really Caligorgia flabellum (Ehrenberg). 



Wrightia coccinea,| — E. S. Eussell gives a description and figure 

 of this hydroid which he found at Millport. It was first described by 

 T. S.Wright in 1H61, under the name Atractylis coccmea, but it must be 

 assigned to the genus Wrightia AUman (1872). Thehydranth makes an 

 obtuse angle with the stem, and is closely invested up to the bases of the 

 tentacles by a hydrothecal expansion of the perisarc, into which, how- 

 ever, it is not retractile. The gonophore resembles in structure that of 

 Garveia nutans. It is pointed out that Wrightia and allied genera have 

 a marked resemblance to Calyptoblasts in having a protective cup for 

 the hydranth and a single verticil of filiform tentacles surrounding a 

 conical hypostome. The Bougainvilliidge may form a transition vStage 

 between the sub-orders Gymnoblastea and Calyptoblastea. 



Antarctic Hydroids.§ — S. J. Hickson and F. H. Gravely report on 

 the ' Discovery ' collection of hydroid zoophytes, which includes 25 

 species. Twenty-three of these represent the hydroid fauna of the most 

 southerly limit of our knowledge of marine zoology, for only two species 

 in the collection were found outside the limits of MacMurdo Bay and the 

 edge of the great ice barrier. Ten species are certainly new, and five 

 more are probably new, which is a, very large proportion in a collection 

 of 25. There is no definitely new generic tjrpe. Three species occur which 

 are common on the British coast. The most interesting and remarkable 

 form is Hydractinia dendriiica sp. n. 



Tentacles of an Antarctic Siphonophore.|l — John Rennie makes a 

 note on the long tentacles of a Siphonophore, each of which, " as stout 

 as an ordinary bootlace," seems to have been nearly 20 feet long. 

 Hodgson gives a graphic account of the difficulties attending their 

 capture. 



Antarctic Alcyonarians.f — S. J. Hickson describes Geratoisis 

 spicata sp. n., an important connecting link between the groups of 

 species formerly separated into two genera, Geratoisis and Primnoisis. 

 The latter name should now disappear. Another new discovery is 

 Frimnoella divergens, which links Primnoella and Galigorgia. The other 



* Proc. R. Soc. Victoria, xix. (1907) p. 46. t Op. cit., ii. (1890) p. 138. 



X Ann. Nat. Hist., xx. (1907) pp. 52-5 (1 fig.). 



§ National Antarctic Expedition, iii. (1907). Hydroid Zoophytes, 34 pp., 4 pis. 

 II Op. cit. 1907, 8 pp., 5 figs. 

 ^ Op. cit., iii. (1907). Alcyonaria, 15 pp., 2 pis. 



