'210 SUMMARY OF CURRENT RESEARCHES RELATING TO 



position of the genital aperture near the tip of a tentacle, the calcareous 

 ring, the pulsating peritoneal saccules or contractile rosettes, the stato- 

 cysts, the touch-papillae, the genital sinus. He also discusses, with 

 reference to L. minnta, the derivation of the anchor from the primary 

 cross, and the alleged homology between Synaptidand Molpadid anchors. 

 Some other interesting points are discussed, such as the viviparity of 

 this species. 



New Starfishes.* — R. Koehler describes Pentaceros bedoti sp. n., 

 characterized by the complete absence of spines on the marginal dorsal 

 plates, by the presence of a few small spines on the last marginal ventral 

 plates, and by the weak development of pedicellarias ; Goniodon angustus 

 sp. n., from New Zealand, which is nearly related to G.dilatatus ; Luidia 

 marginata sp. n. ; and Asterias spinigera sp. n., from Singapore, which 

 has a characteristic appearance due to a number of large and prominent 

 regularly arranged dorsal plates, bearing tufts of strong spines. 



Remarkable Permian Echinoderm.f — J. Wanner describes Timor- 

 echinus g. n. from Permian deposits in the island of Timor, a remarkable 

 type with some affinities with Cystoids, Blastoids, and Echinoids. In 

 the position of the Blastoid stalk there is the mouth, and if this be taken 

 as the under surface then the position of the mouth and anus is identical 

 with that of many irregular Echinoids. Perhaps it may be regarded as 

 a Blastoid form, making an attempt, as it were, towards an irregular 

 Echinoid type. 



Coelentera. 



New Octoradiate Coral. % — Sydney J. Hickson describes PyrophyUin 

 inflata g. et sp. n. from a depth of 150 fathoms in the Gulf of Oman 

 (Persian Gulf). It is a solitary unattached form, with some characters 

 reminiscent of the extinct Rugosa, but with a closer approach to Guynia 

 annulata Duncan. The author considers that Guynia and Pyrophyll ia 

 should be placed in a distinct family of Zoantharia, the Guyniidee, and 

 that this family should be placed next to the family Turbinolida3. 



History of the Study of HydrozoaJ — M. Bedot has brought up 

 his laborious history, which will save future workers much time, to the 

 date 1871. 



Regeneration in Corymorpha.|| — H. B. Torrey describes the re- 

 generation of the hydranth and holdfast in this hydroid. The plasticity 

 which is so conspicuous a characteristic of the normal development of 

 Corymorpha is also a striking feature of the regenerative development. 

 The latter approximates to the former, in fact, at every possible point, 

 varying from it in detail only with the advancing differentiation of the 

 regenerating piece. Tissues in larval stages of differentiation will 

 produce larval structures in the larval way, whether in regeneration or 

 normal development. Adult structures arising on an adult stem vary 

 from this early normal type in the details of their development. The 

 rootlets of the holdfast show the least difference in this respect, de- 



* Rev. Suisse Zool., xis. (1911) No. 1, pp. 1-22 (1 pi.). 



t Zeitschr. Induk. Abstain., iv. (1910) pp. 123-42 (2 pis. and 3 figs.). 



J Mem. Proc. Manchester Lit. Phil. Soc, liv. (1910), No. 12, pp. 1-7 (4 figs.). 



§ Rev. Suisse Zool., xviii. (1910) pp. 189-490. 



|| Publications Univ. California (Zoologv), vi. (1910) pp. 205-21 (16 figs.). 



