PLATE XI. 



Fig. 1. Pentaciinoid larva, stage I, on cirrus joint, of Hathrometra 

 prolixa (Sladen). ^"'/i, 



— 2. Basai plate and lower «talk joints of Pentacrinoid larva of 



Hathrometra prolixa, stage II. ^ '/i. 



— 3. Basai plate and lower stalk joints of Pentacrinoid larva of 



Hathrometra prolixa, stage IV. *'''/i. 



— 4. Stalk joints (Nos. 23 — 24 from above) of Pentacrinoid larva 



of Hathrometra prolixa, stage IV. "^'/i. 



— 5. Calyx, seen from above, of Pentacrinoid larva of Hathrometra 



prolixa, stage I. ^^"/j. 



— 6. Calyx, seen from above, of Pentacrinoid larva of Hathrometra 



prolixa, stage IV. ''/i. 



— 7. Stalk joints, from the middle of the stalk, of Pentacrinoid 



larva of Antedon tenella. *'^'/i. 



