26 



TABLES OF ASTROPHYTONS AND ASTROSCHEMA. 



Table of the simple-armed Astrophytons. 



Teeth, tooth-pajnlloe and 

 mouth-paiiilUe reinesented by 

 a rliiiiii) of sinootli, rounded, ' 

 tapering sjiines, chiefly at 

 inner angle of jaws. 



Teeth, tooth-papinte, and 

 mouth-papilhe all spiniforni, 

 but arranged somewhat as 

 among Ophiurans, on the 

 point of the jaws and along 

 the lower edges of the mouth- 

 slits. 



True teeth as among Ophi- 

 uridie. Xo tooth-papillaj or 

 mouth-papillse. 



Genital openings at outer corners of interbracliial spaces, 

 and parallel to the anns. Skin granulate. Numerous peg- 

 like tentacle-spines 



Astrotoma. 



Genital openings at inner angle of iuterbrachial space. Skin 

 naked and soft. Thorny, hooked tentacle -spines .... 



Genital openings near outer comers of iuterbrachial space 

 and parallel to arms. Skin granulate and beset with stumps 

 or spines. Arms prolonged into the disk as strong ridges 

 occupying most of its upper surface. Numerous tentacle- 

 spines with thorny ends 



Genital openings near outer corner of iuterbrachial space 



and parallel to arms. Skin granidate and beset with stumps 



or spines. Disk rising distinct from the arms. Numerous 



. tentacle-spines with thoruy ends 



Astronyz. 



Astroporpa. 



Astrogomphus. 



Genital openiugs vertical and at inner angle of interbrachial 

 space. Skin naked and soft, a few (usually two) tentacle- 

 spines to each pore Ophiocreas. 



Genital openings vertical and at inner angle of interbrachial 

 space. Skin granulate. A few (usually two) tentacle-spines 

 to each pore 



Astroschema. 



Table of the species of Astroschema. 



Tentacle-spines 



Diameter of disk 



Lenfrth of arm . 



Width of arm . 



Grains on upper 

 surface of arm 

 in a mm. long . 



Disk 



A. oligactes. 



Two, rounded tap 

 ering, to each pore. 

 Towards middle of 

 arm, the one next 

 median line 

 much longer and 

 stouter, andthorny 

 at the tip, but not 



lub-shape. 



gmm. 



140" 



2.5= 



53" 



4 or 5 ; pointed 



Radial ribs wide, 

 not ju'ominent ; 

 margin of disk 

 angular ; surface 

 rough, with sharp 

 grains. 



A. tenue. 



One small and 

 spiniform on each 

 of first two pairs of 

 pores ; beyond that, 

 two to each pore. 

 Towards middle of 

 arm, the larger one 

 is short, club-shape, 

 imm. long, and 

 slightly thorny. 



gmm. 

 200"™- 



1,5mm. 



8 or 9 ; smooth 



Radial ribs nar- 

 row and not prom 

 inent ; margin of 

 disk angular ; sur- 

 face smooth, with 

 small grains. 



A. IsBve. 



None on first 

 pair, or two pairs 

 of pores ; a single 

 flat one till the 8th 

 pore, where begins 

 a small additional 

 one, at middle of 

 arm, about as in 

 A. oligactes. (?) 



A. Steenstrupii. 



None on first 

 pair of pores ; on 

 all beyond two 

 short and thick 



135°""- 



3.5" 



' gmro. 



93" 



9 to 15 ; smooth 



Radial ribs wide 

 and arched, occu 

 pyingthewholeui> 

 per surface ; the mar 

 gin with 10 curves. 

 fJranulation fine 

 and smooth. 



A. sulcatum. 



None on first 

 two pairs ; then a 

 single small one ; 

 farther out, two. 

 Near middle of arm 

 the lai-ger spine is 

 long, bent club- 

 shape, and strongly 

 thorny at the end. 



About as in ^. 

 oligacles. 



2.5mm. 



Grains not close, 

 but set in lines. 



Radial ribs and 

 margin as in A 

 Iccvc. Granulation 

 an-anged in more 

 or less concentric 

 lines. 



About 9 to 15 ; 

 smooth. 



Radial ribs nar- 

 row and not run- 

 ning to the centre. 

 Granulation fine. 



