188 BE. HTKDE AIS^D MR. HOLMES OlS" SPOlS'GE-REMAIIs^S 



fathoms, and according to Mr. Carter this species is likewise 

 plentiful in the Gulf of Manaar (Ann. & Mag. N. H. s. 5, vol. vi, 

 1880, p, 46) and also at various depths in the Atlantic. 



Tihiella Spicules ofMyxilla, O. Schmidt, and other Genera. 



PI. A^II. fig. 14. Slender, regularly curved, fusiform spicule, 

 gradually tapering to either end and terminating with, a conic.'il 

 or lance-shaped inflation. Length '45 mm., thickness "01 mm. 

 Spicules of a similar character but slightly larger are present in 

 S-istoderma' appendiculatum, Cai-ter (Ann. & Mag. W. H. s. 4, 

 vol. xiv. 1874, p. 220, pi. xv. fig. 39 h), from the depths of the 

 Atlantic. 



PI. yil. fig. 48. Tihiella stout, curved, fusiform, tapering 

 gradually to each end and with inflated ovoidal extremities. 

 Length '61 mm., thickness -032 mm. This is both larger and 

 stouter than the preceding, and the inflated ends likewise diff"er. 



PI. VII. fig. 49. Tihiella subfusiform, curved, with evenly 

 rounded club-shaped terminations, not constricted near the ends. 

 Length -37 mm., thickness '012 mm. 



PI. VII. fig. 50. Stout, slightly curved, fusiform tihiella, with 

 ovoid terminal expansions. Slightly constricted near the ends. 

 Length -72 mm., thickness "06 mm. 



PI. VIII. fig. 1. Tihiella with smooth, nearly evenly cylindrical, 

 curved shaft and elongate club-shaped terminations. Length 

 ■412 mm., thickness '017 mm. 



PI. VIII. fig. 2. Slender, smooth, slightly undulating cylin- 

 drical shaft with clavate terminations. Length '365 mm., 

 thickness "006 mm. Spicules similar in form but slightly 

 larger are present in 'Forcepia colonensis, Carter (Ann. & Mag. 

 N. H. s. 5, vol. XV. 1885, p. 110, pi. iv. fig. 2 «), from off Port 

 Phillip Heads, Australia, at a depth of 19 fathoms. 



PI. VIII. fig. 3. Tihiella with elongate, cylindrical, irregularly 

 curved shaft and prominent club-shaped ends. Length '765 mm., 

 thickness -008 mm. Slightly shorter, but otherwise similar 

 spicules occur in Phloeodictyon hirotuliferum, Carter (Ann. & Mag. 

 IN". H. s. 5, vol. xviii. p. 447, pi. x. fig. 2 6), from ofli" Western 

 Austraha. 



PI- VIII. fig. 4. Very slender tihiella with curved cylin- 

 drical shaft and elongate club-shaped terminations. Length 

 •215 mm., thickness "003 mm. Very similar spicules are present 

 in Halichondria infrequens. Carter (Ann. & Mag. N. H. s. 5, 

 vol. vii. 1881, p. 309, pi. xviii. fig. 9 6), from the Grulf of Manaar. 



