580 SUMMARY OF CURRENT RESEARCHES RELATING TO 



New Indian Phylactolaemata.* — N. Annandale describes Plumatella 

 bombayensis sp. n. and Pectinatella burmanka sp. n., the latter being 

 established on the state-blasts only, which were found attached to the 

 protective tube of the Oligochaete worm Aulophorus tongkinensis, a 

 most industrious collector of gemniules and statoblasts. 



Brachiopods from Bay of Biscay. f — A. Reynell notes that the 

 ' Huxley ' collected in 1906 from the north side of the Bay of Biscay 

 the following three species — Magellania cranium Miiller, M. septigera 

 Loven, and Miihlfeldtia truncata Linne. The last is probably a new 

 record, Turton's Torbay locality being very doubtful. 



Echinoderma. 



Cross-fertilised Echinoid Ova. J — D. H. Tennent has made sections 

 of Toxopneustes variegatus eggs fertilised with the sperm of Moira 

 atropos (a Spatangoid), and of Arbacia punctulata eggs fertilised with 

 Moira sperm. The results of the study may be summarised as 

 follows : — The equatorial plate of the Moira- Toxopneustes cross shows 

 a mixture of two kinds of chromosomes not sufficiently unlike one 

 another to enable a positive distinction between the two to be drawn. 

 (2) The equatorial plate of the Moira- Arbacia cross shows a mixture of 

 two kinds of chromosomes, one variety long, the other variety short. 

 These differences in form are correlated with the spermatozoon and the 

 egg respectively. 



Regeneration in Ophiuroids.§ — C. R. Stockard, who has made 

 many interesting experiments on Medusae, has also worked with 

 Ophiocoma riisei and another Ophiuroid. Both species regenerate their 

 arms more rapidly when cut close to the disk than when cut at greater 

 distances away. The deeper the level of the cut the more rapidly will 

 the ensuing regeneration take place. Individuals of both species were 

 selected and divided into groups, from which different numbers of arms 

 were removed, all arms being cut at a distance of 1 cm. from the disk ; 

 0. riisei regenerated its arms at rates entirely indifferent to the degree 

 of injury inflicted ; the other (undetermined) species regenerated its 

 arms fastest when few had been removed, and distinctly slower when 

 many had been removed. Starfish, with five arms cut off, regenerated 

 only three-fourths as rapidly as those with one arm removed. These 

 results are the opposite of those obtained from Medusae. 



New Crinoids. — A. H. Clark|| describes, in the first place, two new 

 Stalked Crinoids from the Eastern coast of North America, — Bathycrinus 

 serratus sp. n., and Rhizocrinus verrilli sp. n. 



He goes on II to describe twenty-four new species of free Crinoids, 

 chiefly from the Hawaiian Islands, " a collection of very exceptional 

 interest, quite as much through the forms which are lacking as through 



* Records Indian Museum, ii. (1908) pp. 169-74 (5 figs.), 

 t Journ. Mar. Biol. Assoc, viii. (1909) pp. 392-3. 

 % Biol. Bulletin, xv. No. 3 (1908) pp. 127-34 (1 pi.). 

 § Carnegie Inst. Washington, Yearbook No. 7 (1908) p. 131. 

 | Proc. U.S. Nat. Museum, xxxiv. (1908) pp. 205-S (3 figs.). 

 i Tom. cit., pp. 209-39. 



