6 TABLE OF CONTENTS. 
Prats IX.-XIL. Development of Ecutnorea. Figures from ALexanper Acassiz, WitniuLm Buscn, J. W. 
Fewxes, H. Garman and B. P. Couroy, Avcust Kroun, JOHANNES MUuver, and Emin Serena. 
Piare IX.— 1-16 Echinus miliaris. 4 “ '. From E. SELENKA. 
17-19 Strongylocentrotus lividus "i 5 ss ae 
20-23 Arbacia pustulosa . ; 3 , cs “ 
24-27 Echinocardium cordatum i Cs ke ° 
28,29 Arbacia pustulosa . ‘ ‘ 5 “ OW. Buscu. 
30-37 Arbacia pustulosa : 4 “ Jonannes MUiiER. 
38-40 Arbacia punctulata . : : : co J. W. Frwxes. 
41 Arbacia punctulata 3 26 8 «© ALEXANDER AGASSIZ. 
42,43 Arbacia punctulata 5 fe fe * H. GarMAN and B. P. Coiron. 
44,45 Arbacia punctulata 4 i ‘ ‘© ALEXANDER AGASSIZ. 
Puare X. — 1-44 Strongylocentrotus Drébachiensis . ce & “ 
PiatEe XI. —1, 3,5 Spatangus purpureus . : «cA. Kroun. 
2, 4, 6-9 Spatangus purpureus 3 5 5 * JoHANNES MULLER. 
10 Spatangoid Pluteus C - c Ss 03 6 
11 Echinoid Pluteus . : A Ke cs “6 
12-18 Echinus lividus . 6 6 e se sé G3 
19-27 Echinocyamus pusillus? — . 0 ce Os Cs 
28 Echinarachnius parma ? : : «© ALEXANDER AGASSIZ. 
29 Echinus acutus : 5 p : «© JOHANNES MULLER. 
30 Echinus brevispinosus . 5 : ie a cs 
Pirate XII. — Youne Sraces or Ecuint. 
1-3 Goniocidaris canaliculata . A . From ALEXANDER AGASSIZ. 
4 Dorocidaris papillata . S : ce eras OG 
5,6 <Asthenosoma hystrix : 5 E sé 6 cs 
7 Diadema setosum ‘ . , OG =e ce 
8-12 Mellita seaxforis 5 3 é 6 ve bs Se 
13,14 Mellita testudinata 3 2 : ie We ne 
15,16 Mellita longifissa . 4 5 A Gs oa OB E 
17-22 Lechinarachnius parma . 6 4 ss se es 
23, 24 Encope emarginata . 2 6 4 es 06 ce 
26-29 Conolampas Sigshet 0 9 5 se e ss 
30 Hemiaster cavernosus 3 2 3 ‘© WyvILLE THOMSON. 
31-35 Hemiaster cavernosus . 5 C ‘© ALEXANDER AGASSIZ. 
36, 36’ Spatangus purpureus c 3 6 se ss ss 
37-40 Brissopsis lyrifera 6 z i oo ce ce 
Piares XIII.-XV. Development of Hororuvroipea. Figures from D. C. DantetssEN and J. Korey, Entas 
MerscHNIkorr, JOHANNES MULieR, and Emin SELENKA. 
Prats XIII.— 1-11 Synapta—Auricularia with calcareous wheels From JOHANNES MULLER. 
12-17 Synapta (continued) . Q S «¢ FE, MreTscHNIKOFF. 
18 Auricularia with calcareous gland . 2 ‘© JOHANNES MULLER. 
19 Auricularia with eleven spheres s a < s 
20-32 Auricularia with elastic spheres. ss oo se 
33-37 Auricularia with dendritic anal gland . es sf “S 
Pirate XIV.— 1-12 Holothuria tubulosa : : 5 «cK. SELENKA. 
13-27 Holothuria tremula 5 4 5 « DP). C. DanrevssEn and J. Koren, 
Puate XV.— 1-13 Cucumaria doliolum : «© E, SELENKA. 
14-27 Homologies of Ecutnoprrm Larya2 . «© JoHANNES MULLER. 
