261 



Fig. 3. Fully formed larva: the hydrocoel lias formed the primary lobes. The ruilinientary 

 skeleton (sk.) is MTU. 150 /,. 



- 4. Larva in a slightly less advanced stage, with a right hydroeoel. '"" ,. 



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

 to the rectum, which is seen here directly from above. 150 /i- 



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



to cover I lie oral region. 



7. Abnormal larva. '"" ,. 



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

 two small, nearly absorbed eggs (e.). '%. 



!). An ovary, attached to the genital rhachis; a trabecule of connective (issue is pro- 

 ceeding from the ovary. 85 /i- 



a. c. anterior coelom: e. egg; h. hydroeoel: m. month; n. nerv(?); p. c. posterior 

 coeloin; r. rectum: rh. rhachis; sk. skeleton; st. stomach; tr. trabecule. 



Plate XXXIII. 



Fig. 1. Larva of Axtirina pi-ctinifrra (M. Tr.): 18 days old. Drawn from life. '"" ,. 



2. Fully formed larva of same species; same age. Drawn from life, '""/i- 



I!. Larva of Axlropirli-n xrtipariim M. Tr., 7 days old. s. c. suhoral cavity. 86 / 1 . 



1. Larva of same species, 1!) days old. Side view. 85 /,. 



f>. Larva of same species, in metamorphosis. 19 21 days old. <*/,. 



6. Larva of (ii/nuuixliTia carinifera (Lamk): 26 days old. 150 /j. 



7. Hipiniiaria s|>. from the Ked Sea. 60 /i- 



8. Larva of SlidKi/nis ctili/ornii-nx (Stimps.). li days old. Drawn from life. ,. 

 C J. Larva of same species, same age; side view. Drawn from life. 75 /i- 



