550 



REVISION OF THE AXINELLIDiE, 11., 



with their length) but slightly curved, often somewhat flexuously; 

 and with extremely rare exceptions are unprovided with a sub- 

 basal annular inflation : otherwise, in shape, they are similar to 

 the preceding, with which they form a continuous series. In the 

 typical specimen, they range from somewhat less than 1000 to 

 upwards of 1500/x (rarely to nearly 1600/x) in length, and up to 

 IS/A in diameter, spicules between 900 and 1000/x in length being 

 comparatively rare; in the other specimen, they are of equal 

 stoutness, Init seldom surpass 1250/x, and veiy rarely if ever 

 attain to more than 1400/a in length, while individuals between 

 900 and 1000/x long are comparatively frequent. 



Mkrosderes. — The trichites, both composing the dragmata and 

 scattered singly, are very slender, always less than 0-5/x in 

 diameter, and vary in length from 75 to 110/'.; they are very 

 frequently curved or Hexuous. The dragmata are seldom as 

 much as 5/x in diameter, and as a rule they are very compactly 

 composed and somewhat fusiform in shape; they are often much 

 longer than the trichites, occasionally attaining a length of 200/a. 



EXPLANATION OF PLATES. 



Plate xxix., fig. 4. 

 Eig.4. — AVanlopliora jjliaihi AVhitelegi,'c; .showing the skeleton (photo- 

 graphed by tiansniitted light) of portion of a lamella of the tyjx-- 

 specimen, the lamella varying in thickness from 1-8 mm.; (nat size). 



Plate XXX. 

 Fig. 1. — A//(iiifojilinr<( j//iri(/(( \Vhitelegge; jjoilion of a spiriL-speeimen; 



Fig. "2. — A. ^/^?V'r^/r6* Whitelegge ; portion of a lamella i>i the partially 

 maeeiated, dried type-specimen; (nat. size). 



Fig..'{. — A. plicata Whiteleggc; an entire lamella of a dry, wasiied-out 

 specimen, showing the texture of the skeleton; (nat. size). 



Figs. 4, o. — A. rictoriaii't, sp.nov.; specimens of massive form (r;/'. Pi. xxxi., 

 Hg.3);(^A). 



Fig.H. — A. ciocdlyptoides Dendj^ ; a subniassive, digitate .specimen, at- 

 tached to a stone; ( x x\)- 



Fig. 7. — A. ciocalyptoide^' Dendy ; a semi -encrusting specimen, growing 

 upon a stone; (/j). 



Fig. 8. — A. ciocaJyjdoklea, var. reducta, var.nov. ; ( x /j). 



