Mr. H. J. Carter on the Lithistidse. 439 



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

 Arms sinuous, branched, curvilinear, tubercled on the upper or 

 outer aspect, and jiligreed at the extremities ; shaft jiligreed also 

 at its extremity. 



Minute spicule long, slender, fusiform, subspinulate, smooth, 

 most numerous on the margin, where it forms a fringe. 

 Azorica Pfei fierce, Carter. Azores. (11) 



Species in which the surface-spicule is much the same as the last, but 

 with others like those of Dactylocalyx Bowerbankii and D. poly- 

 discus among the body -spicules. 



No minute spicule observed. 



Corallistes horealis. Carter. Faroe Islands. (12) 



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

 arms, bifurcated and more or less tubercled on the outer or upper 

 aspect. 



Minute spicule (in the slide at the British Museum) straight 

 or slightly curved, smooth, fusiform, acerate. 



Corallistes noli ta?igere, Schmidt. Portugal, St. 



Jago. (13) 



Species in which the surface-spicule (according to the slide in the British 

 Museum) is like that of Dactylocalyx Hasoni, with the branches 

 of the body-spicides in like manner glomerato -tubercled. 



Minute spicules in the slide of two kinds, viz. one acerate, 

 fusiform, curved, smooth ; and the other with sinuous shaft, 

 spirally covered with fine spines like that of D. Masoni. 



Corallistes microtuberculatus 7 Schmidt. St. Jago, Cape- 

 Verde Isl. (14) 



Species inwhich the surface-spicule (according to the slide in the British 

 Museum) is like that of Dactylocalyx Bowerbankii ; the rest with 

 large jiligreed head and long sinuous shaft jiligreed at the 

 extremity, as in the figure (Atlantisch. Spongienf. Taf. iii. f. 5). 



Corallistes elegantior, Schmidt. Portugal. (15) 



Species with curly jiligreed spicules (according to the slide). 



Leiodermatium ramosum, Schmidt. Florida. (16) 

 lynceus, Schmidt. Portugal. (17) 



Fossil species in which the surface-spicule is not known, but in which 

 the body-spicide has the common branched jiligreed form. 



Minute spicule not observed. 



Lithospongitis Kittonii, Carter. Carrow, hamlet ad- 

 joining Norwich. (18) 



