ACTIN'Ol'ODOrS HOI.OTHCEIOIDEA. 221 



dccklodly [)outangulai', the median ventral ambulaeruni becomin^^ 

 prominent. Those five angles correspond to tlu^ five valves by 

 wliicli the montl) is closed. Tlie tliree ventral ambulacra are 

 distinct, each sbowiiiL' about two pedicels standing side by side at 

 the ends, but in the middle more than two. In the dorsal lateral 

 rows of papilla?, the bases of these arc surrounded by spiny elevations 

 formed by calcareous plates whicli make the wliole body stiff and 

 liard. All the interambulacra are iiaked and in most specimens 

 darker colored tlian the ambulacra. Tentacles ten ; two venti'al 

 tentacles smaller than the rest. Calcareous ring simple : I can not 

 discover that any of the joints are narrower or more crowded than 

 the rest. Polian vesicle one. Stone-canal one, attached to the 

 dorsal mesentery. Genital tubes unbranched. Pietractors inserted 

 at about 1/4 of the body length. Anus with five small teeth. 

 Calcareous deposits of three kinds : (i) small reticulate hemispheres, 

 (ii) knobbed buttons, ami (iii) large plates. In addition to these 

 there are found (a) supporting rods, (//) tentacular supixjrting rods, 

 and (c) distinct end-plates. 



LovaJlhj : — -Cjipe of (to.) 1 Hope (ojirlior authors) ; Ijowcii (Li'dwig '74) ; 

 Sydney (Ludwig 7-4) ; Port Jackson (]5Eii '8G) ; Port Mollc (Peu, '8G) ; 

 New Soutli Wales (Lampkkt '8Gj ; West Australia (Lampert '86) ; Amlioina 

 (Ludwig '88, SLurraR '94) ; Bahia (Theel '8G) ; Billiton (Sluiit-r '87) ; 

 Ceylon |Pi:ar-!(W '03) ; Ivxst Coast of Japan, from IJokkaiclo to .Satsuiua. 



51. Colocfu'riis iiioriKfttts v. jMareszeixer. 

 (]'!. Till, fig. 7:5; toxtfig. 4(» . 



Cdochirm inoninfiif! v. Marenzeu.ER 1881, pp. 130 — "2, Taf. Y., Fig. 7. 

 — L.vmpert 1885, p. 1-27.— Theel l^°6n, p]i. 77, l-'o, PI. \\.. fig. 8.— 

 Lampert 1889, p. 824. 



Thyone {nornatn Tahwig 188!) — 92, p. 34(!. 



