IN THE LOWEE TEETIAET STEATA OF NEW ZEALAND. 219 



lu the lower of these the spines are directed obliquely downwards, 

 whilst in the two higher whorls they curve towards the apex. The 

 spines in these whorls are thickly set with secondaiy spines. 

 At the upper end is a whorl of upwardly curved spines, and a 

 single prominent spine forms the apex. Length of spicule '093 

 mm., greatest width of whorls •04<S mm., thickness of shaft 

 •013 mm. 



Latru7iculia (m). — PL XI. fig. 38. Shaft subcylindrical, with 

 two whorls of small spines at the base, succeeded above by an 

 inverted saucer-like disc with dentated margin, and a similar 

 but smaller disc with the concavity upwards. At the summit is 

 a whorl of curved teeth or spines. Length of spicule '043 mm., 

 width of lower disc "027 mm., thickness of shaft '0075 mm. 



Latrunculia (n).- — -PI. XI. figs. 39, 40. Sceptrella with slender 

 cylindrical shaft having at the base two or three whorls of 

 minute spines, and in the middle portion of the shaft two whorls 

 of lobate plates with spined margins. At the summit a whorl of 

 curved blunted spines. Pig. 11 shows, on the scale of 600 dia- 

 meters, one of the lobate whorls as seen from above, the section 

 of the circular shaft with the axial canal can be distinguished. 

 Length of spicule "075 mm., width of whorl '033 mm., thickness 

 of shaft '006 mm. 



The six forms described above (PI. XL figs. 34-39) are modi- 

 fications of a common plan. Secent flesh-spicules of this type 

 are present in the following species : — Latrunculia cratera, Socage 

 (Journ. d. Sci. Lisbonne, no. 4, 1869, pi. xi. fig. 2) ; L. Bocagei, 

 Ridley & Dendy, L. hrevis, Eidley & Dendy (Chall. Rep. vol. xx. 

 ])p. 237, 238, pi. xlv. figs. 8 a, 10 a) ; L. purpurea, Carter (Ann. & 

 Mag. jS'at. Hist. ser. 5, vol. vii. 1881, p. 380, pi. xviii. figs. 5 &, c) ; 

 and also in detached spicules described by Mr. Carter from 

 deep water off th.e Seychelles (Ann. & Mag. Nat. Hist. ser. 5, 

 vol. iii. 1879, p. 358, pi. xxix. figs. 14, 17) ; and they differ 

 from the fossil forms only in the details of size and the 

 disposition of the spines, &c. 



Latrunculia (o). — PL XL fig. 24. Sceptrella with base of 

 shaft expanded, with projecting simple spines; succeeded above 

 by a nearly median whorl of depressed spines and an upper 

 whorl of curved spines. The apex consists of a group of thin 

 vertical laminae with their edges outwards. Length of spicule 

 •04 mm., width of lower whorl '016 mm., thickness of shaft 

 •006 mm. 



