conical tubercles. Gray, Ann. N. H. 1910, \^. 277 ; Seha, 

 iii. t. 5. f. 5, 6. Oreaster acuieatus, Miill. ^~ Trosch. Ast. 

 50. Var.? or younger? Spiue-bearing ossicula further 

 apart, with the skin and granulations worn oft' and blcachedj 

 Seba, iii. t. 7. f. 1. luhab. West Indies, St. Vincent's, 

 Rev. J. GuUdiiifi. 



Sec also Pealaceros sp'mosus. Ast. nodosa (part.), Ginel . 

 Seba, iii. t. 5. 7, 8, and vai'., Seba, iii. t. 7. f. 1, 2. Ossicula 

 oblong, with, two or three small conical tubercles. 



d. Back regularly convex, formed of flat granular ossicula, 

 with a blunt mobile spine on the centre of each ossiculum 

 below ; arms short, broad. Nidorellia, Gray, Ann. 

 N. H. 1840, p. 277. 



13. Pentaceros armatus (T. 11). Arms short, broad, the 

 lower marginal and the last three upper marginal plates at 

 the top with short blunt spines; baclv convex, with central 

 and lateral groups and a series of S])ines down each arm. 

 Young more convex ; spines shorter, blunter, and fewer. 

 Younger not so convex, without any marginal spines, and 

 only indications of them on the back. Gray, Ami. N. H. 

 1840, p. 277. Oreaster armatus, Miill. ^ Trosch. Ast. .52. 

 Gonodiscus conifer, MUbius, Abhandl. iv.lO,t.o.f. 5,G, 1860. 

 Inhab. Punto Santa Elena. Rock ground, 12 to 15 fathoms, 

 H. Cuming, Esq. 



IV. Stellastek. Body depressed, covered with large, 

 flat, regular, six-sided plates; margin with two rows of large 

 tessera; ; the lower rows with a series of compressed mobile 

 spines. Gray, Ann. N. H. 1840, p. 277 ; Miill. &• Trosch. 

 Ast. 62, 1842. 



1. Stellaster Childreni (T. 7. f. 2). Back convex, with 

 one or two blunt tubercles on the angles of the centre ; 

 arms tliree-quarters the length of the width of the body, 

 narrow, attenuated to a blunt reciu'ved tip. Young, back 

 without anv tubercles. Gray, Ami. N. H. 1840, p. 278; 

 Miill. ^ Trosch. Ast. 62, 128, t. 4. f. 3, t. 6. f. 5. Inhab. 

 China or Japan ? 



Seea. Asterias equestris,i?e/.r.i)psc/'. 12; Stellasterequcs- 

 tris, 3IUII. Sf Trosch. Ast. 62; Ocean (Mus. Lund), b. 

 Stellaster gracilis, MiJbius, Abhandl. iv. 1860, ii. t. 11. 

 f. 3, 4, which is very nearly allied, if not the same in a 

 rather diti'crent state. This state has also been described 

 by Dujardiu under the name of Astrozonium Souleyetii. 



2. Stellaster Belcheri (T. 7. f. 1). Back convex, with two 

 or three large conical tubercles on the line extending to 

 the centre of the arms. Arms slender, taj)cring, rather 

 longer than the diameter of the disk. Gray, P. Z. S, 1847, 

 p. 76. Inhab. Amboina or New Guinea. 



This species is intermediate between S. Childreni and 

 S. Incei, having the white colour and the slender arms of 

 the former, and the convex back and tubercles of the latter ; 

 but the tubercles are larger and fewer, and the arms ai'e 

 more slender, having only a single series of plates between 

 the marginal ones. There are two specimens in spirits, 

 and one cb'v, in the British Museum collection. 



down the centres of the arms largest. The lower marginal 

 plates are flattish. Gray, P. Z. S. 1817, p. 76. Inhab. 

 North Australia. 



This species is very like Stellaster Childreni, Gray, Ann. 

 & Mag. Nat. Hist. 1810, p. 278; Miiller, Aster. 62, 128, 

 t. 4. f 3; Asterias equestris, Retzius, Diss. 12 ; but it is pur- 

 plish when dry ; the buck is tubercular ; the whole surface 

 is minutely granular ; while the Japanese species is always 

 white, the back smooth, and the granules of the sm-face 

 are so minute aiul thin that they are very easily eroded, 

 and the lower marginal plates are more convex and the 

 central ones much larger than the others. 



V. DoRiGONA. Body depressed, 5-rayed, smooth ; the 

 dorsal and oral disk covered with many smooth, flat, poly- 

 gonal squares ; the marginal ossicules without any mobile 

 spine. 



1. Dorigona Reevesii (T. 7. f. 3) . Inhab. China or Japan ; 

 common in l)0xes of insects brought from China and Japan. 



See a. Dorigona longimaua=x\.strogonium lougimanum, 

 Mobius, Abhandl. iv. (1860) 7, t. 1. f. 5, 6. 



VI. CoMPToNiA. Body depressed, spinous (?); dorsal and 

 oral disk covered with very small flat plates ; marginal 

 ossicula large, without any mobile spines. Gray, Ann. 

 N. H. 1840, p. 278. 



1. Comptonia elegans. The fossil genus Ccelaster, Agassiz, 

 from Maestricht, appears to be most nearly allied to this 

 genus ; but the plates of the oral disk (wliich alone are 

 known) appear to be linear longitudinal. Gray, Ann. 

 N. H. 1840, p. 278. Fossil. Black Down. 



VII. Calliderma. Body flat, five-sided; rays rather 

 elongated ; attenuated end only formed of the marginal 

 plates. Ossicula all minutely granulated ; the dorsal 

 ossicula flat-tipped, six-sided, some with a larger, globular 

 central tubercle-like granule. The marginal ossicula 

 broad, gradually becoming smaller near the tip, short-edged, 

 minutely granular, those of the upper and lower series 

 alternating; the upper ones with some indistinct spines 

 on the margin, the lower ones with scattered mobile spines 

 on the oral sm-face. The ossicula of the oral surface 

 three-, four-, or six-sided, granular, with one (rarely two) 

 central, compressed, acute, mobile sjDine. The ambulacral 

 spines very small, close, fourteen or sixteen on each ossi- 

 culum, forming a rounder group, with two or three series 

 of large, scattered, mobile, acute spines on the outer side. 

 Gray, P. Z. S. 1847, p. 76. 



This genus resembles Stellaster, but diflers from it in 

 the oral surface being furnished with scattered spines. 

 There is a fossil species, very like the one here described, 

 found in the chalk, and figured in Mr. Dixon's work on 

 the fossils of Worthing, which I propose to call Calliderma 

 Dixonii. There are probably several other fossil species 

 i'rom tlie same locality ; they have been referred to the 

 to the genus Tosia, but the ossicula are granular and the 

 oral surface spinous. 



3. Stellaster Incei (T. 5. f. 1). Purplish, minutely gra- 1. Ca/Z/rfenwa jBwHwa (T. 15). Flat, pentangular, the sides 



nular; back with scattered, conical, convex tubercles, those concave, the arms elongated, produced, tapering to a fine 



