438 Mr. H. J. Carter on the Lithistidas. 



Species in which the surface-spicule consists of a shaft and three 

 sinuous arms branched. 



Minute spicules of two kinds, viz. one long, fusiform, sub- 

 spinulate, smooth ; the other short, more or less bent or horse- 

 shoe-shaped and microspined. 



Tkeonella Swinhoei, Gray. Formosa. (4) 

 Dactyhcalyx Prattii, Bk. East Indies. (5) 



Species in which the surface-spicule consists of a shaft and three sinuous 

 arms compressed vertically ; branched and dentate or curvilinear 

 on the margins. 



Minute spicule acerate, fusiform, curved, microspined. 



MacAndrewia azortca, Gray. Azores. (6) 



= Corallistes clavatella, Schmidt. Florida. (7) 



Kaliapsis cidaris, Bowerbank. South Seas. (8) 



Species in ivhich the surface-spicule consists of a short shaft and 

 subcircular discoid head, deeply and irregularly fissured. 



Minute spicule acerate, fusiform, curved, blunt-pointed' 

 microspined. 



Corallistes polydiscus, Schmidt. Portugal, Florida, 

 Cuba. (9) 



Species in which the surface-spicule consists of a short shaft and 

 subcircular discoid head. 



Minute spicule acerate, fusiform, curved, microspined. 



Dactyhcalyx polydiscus, Bowerbank. St. Vincent, 

 Portugal. (10) 



6. B.M. P. Z. S. 1859, p. 438, pi. xv. Dactyhcalyx McAndrewii, Bk. 

 P. Z. S. 1869, p. 86, pi. iv. fig. 5. 



7. Atlantisch. Spongienf. pi. iii. f. 7. 



8. P. Z. S. 1869, p. 338, pi. xxv. figs. 2 & 5. 



9. Atlantisch. Spongienf. 1870, p. 24, pi. iii. figs. 8 & 9. 



10. B.M. P. Z. S. 1869, p. 96, pi. vi. figs. 10-14. Discodermia poly- 

 discus, Bocage, 1869, Journ. des Sc. Math. Phys. et Nat. Lisbonne, No. iv. 

 pi. xi. fig. 1, &c. 



11. B.M. See p. 442. 



12. See p. 443. 



13. Atlantisch. Spongienf. p. 23, pi. iii. fig. 6, &c. 



14. lb. p. 23, pi. iii. fig. 4. 



15. lb. p. 23, pi. iii. fig. 5. 



16. lb. p. 22, pi. iii. fig. 1. 



17. lb. p. 21, pi. iii. fig. 2. 



18. Seep. 443. 



