56 PROCEEDINGS OF THE ACADEMY OF [Feb., 



aa — Teeth and dental papillae well developed, but oral papillae 

 absent or very rudimentary; oral and adoral shields 

 separated from each other by a mosaic of supplementary 



plates AsTROTOMINiE. 



A A — Arms branched many times; teeth, dental papillae and oral 

 papillae all well developed; oral and adoral shields separated 

 from each other by a mosaic of supplementary plates, 



GoRGONOCEPHALINvE, pars. 



Subfamily 1. GORGONOCEPHALINiE Doderlein, 1911 (emend.). 



(Characters as given above in keys.) 



This subfamily includes Astrogotnphus, Astrochele, Astrochlamys, 

 Asteroporpa, Astrocnida, Conocladus, Astroconus, Gorgonocephalus, 

 Astrodendrum, Astrocladus, Astrospartus, Astroboa, Astrophytum, 

 Ophiocrene, Astrochalcis, Astrogordius, Astrocyclus, Astrocaneum and 

 Astrodactylus. 



Astrocladus annulatus (Matsumoto). 



Aslrophyton annulatum, 1912. Dobuts. Z. Tokyo, 24, p. 206 (in Japanese) ; 



figs. 17, 18. 

 Astrocladus annulatus, 1912. Dobuts. Z. Tokyo, 24, p. 389. 



Diameter of disk, 22 mm. Distance from centre of disk to inter- 

 radial margin, 8.5 mm. Distance from outer end of oral slit to first 

 bifurcation of arm, 11 mm. Arms branched nineteen or twentj^ 

 times, measuring about 125 mm. in total length. Width of ventral 

 side of arm base within disk, 4.5 mm. Disk five-lobed, with concave 

 interbrachial borders, covered by a thick skin, which is apparently 

 smooth, but contains fine, close-set granules of microscopic size. 

 On the radial ribs these granules are flattened, pavement-like and 

 coarser, being even visible to the naked eye. Several smooth, 

 hemispherical tubercles are scattered on the disk. Radial ribs 

 gently raised, forming rounded ridges, with rather indistinct out- 

 lines, not quite reaching to the disk centre; their back is marked 

 with concentrically arranged swellings, corresponding to the imbri- 

 cating, soldered plates, of which the radial shield is composed. The 

 ventral surface of the disk appears smooth to the naked eye. Genital 

 slits not very large. 



Madreporic shield single, at inner corner of a ventral interbrachial 

 area, small, transversely oval. Teeth and dental papillae, conical 

 and rather stout. Oral papillae and lower dental papillae, smaller 

 and very short. 



Arms slender and branched, with distinction of trunk and lateral 

 branch even at the base ; covered on dorsal side by a finely and closely 



