202 DE. HINDE AND ME. HOLMES ON SPONGE-EEMAIKS 



correspond witli the equi an cli orates of Myxilla nohilis, Eidle}- 

 and Dendy (Chall. Eep. vol. xx. p. 140, pi. xxvii. figs. 15 c, d)^ 

 from off the Crozet Islands, at depths from 240-550 fathoms. 



PI. IX. figs. 47, 47 a. Small equianchorates, shafts curved, 

 teeth short, simple. Pig. 47 is a front view ; 47 a is a lateral 

 view of a similar but larger form. Length of spicule (fig. 47) 

 "016 mm., width across teeth "0067 mm., thickness of shaft 

 •0016 mm. 



PI. IX. figs. 51, 52. Small equianchorates with stout curved 

 shafts, ends rounded, and short, simple teeth. Length of spicule 

 •036 mm., width across teeth ^02 mm., thickness of shaft "006 

 mm. Pig. 52 is a lateral view of probably the same spicule. 



PI. IX. figs. 54, 55. Equianchorates with stout shafts, rounded 

 ends, and simple slightly extended teeth. Length (fig. 54) 

 •046 mm., width across teeth "016 mm., thickness of shaft 

 '006 mm. 



Myxilla (e). — PI. X. fig. 21. Equianchorate with strongly 

 curved shaft, and having the lateral teeth much extended and 

 curved inwards, so that they nearly meet each other. Anterior 

 tubercle elongate. Length of spicule '04 mm., of lateral teeth 

 •017 mm., width across teeth "016 mm., thickness of shaft 

 •0033 mm. 



Myxilla (f). — PI. X. fig. 22. Lateral view of equianchorate 

 with an evenly curved shaft and short incurved obtuse teeth. 

 Length of spicule '027 mm., of teeth "006 mm., thickness of 

 shaft '005 mm. Detached spicules of this form are present in 

 the ' Egeria ' dredgings off the S.W. coast of Australia, at a 

 depth of 8000 fathoms. 



Myxilla (g). — PL X. fig. 80. Equianchorate with slightly 

 curved shaft and long slender upright teeth. Length of spicule 

 •051 mm., of teeth "02 mm., thickness of shaft •OOS mm. Only 

 the lateral view known. 



Myxilla (h). — PI. X. fig. 48. Equianchorate with sharp 

 harpoon-like ends ; the lateral teeth triangular, acutely pointed, 

 anterior teeth outwardly projecting. Length of spicule '087 mm., 

 of teeth "014 mm., width across teeth "015 mm., thickness of 

 shaft '007 mm. This spicule is distinguished by the angular 

 ends and the long slender teeth. Somewhat similar but smaller 

 equianchorates are present in Myxilla veneta, Osc. Sch. (Adriat. 

 Spong. p. 71, pi. vii. fig. 4 c). 



Myxilla Dendyi, n. sp. — PI. X. figs. 49-52. Anchorate spicules 



