261 



Fig. 3. Fully loniuil larva; llir liy<ln)i()cl has fdiiiicd llir priiiiaiy lobes. Tlie rudimenlary 

 ski'lolon (sk.) is sccMi. '■'",. 



- 1. Larva in a slif^hlly less advaiueil slaf^e, with a rislil liychoeoel. '"",. 



- 5. Fully formed, normal larva. The round hole seen in the slomach is the entrance 



to the reelum, which is seen here directly from above, '"/i- 



- (). Fully formed larva, in side view. The oral lobe is bent somewhat forwards so as 



to cover the oral region. 

 7. Abnormal larva. '^^^ ,. 



- 8. The young Ophiuran lyint» within the ovarial sac, on the wall of which are seen 



two small, nearly absorbed eggs (e.). *"/,. 



- 9. An ovary, attached to the genital rhachis; a tralxcule ol coniuclive tissue is pro- 



ceeding from the ovary. 'Vi- 



a. c. anterior coelom; e. egg; h. hydrocoel; ni. moulli: ii. nerv(?); p. c. posterior 

 coelom: r. rectum; rli. rhachis; sk. skeleton; si. stomach; Ir. trabecule. 



Plate XXXIII. 



Fig. 1. Larva of Asterina pedinifera (M. Tr.); 18 days old. Drawn from life. '""/i. 



- 2. Fully formed larva of same si)ecies; same age. Drawn from life. '°7,. 



- 3. Larva of Astropeden scopariiis M. Tr., 7 days old. s. c. suboral cavity. "Vi- 



- 4. Larva of same species, 19 days old. Side view. »^,. 



5. Larva of same species, in metamorphosis. 19 — 21 days old. ^/i- 



- 6. Larva of (iymnaslcria carinifern (Lamk); 26 days old. '''"/i- 

 7. liipinnuriu sp. from I lie Red Sea. ""/,. 



- 8. Larva of Slichopus californicus (Slimps.), 6 days old. Drawn from life, "/i- 



- 9. Larva of same species, same age; side view. Drawn from life, "/i- 



