3i: 



DISCOVERY REPORTS 



slightly curved and bearing a basal mucron; dermal skeleton a tangential layer of 

 tornota regularly crossing each other in all directions, supported by brushes of tornota 

 planted directly on distal ends of ascending fibres of main skeleton; tornota inequi- 

 ended, 0-25 by o-oo8 mm., with ends slightly swollen and bearing a terminal mucron 

 surrounded by numerous microspines ; microscleres sigmata of two sizes, 0-042 and 

 0-025 rnrn- chord, and ancorae spatuHferae of two sizes, 0-042 and 0-021 mm. chord. 



Remarks. The species is very closely related to M. magna, Topsent, and it is indeed 

 possible that the two may eventually prove to be identical, but the present species differs 

 from Topsent's species in external form, in the dimensions of its spicules and in the 

 presence of a basal mucron on the styli. 



A 



Fig. 26. Myxilla basimucronaia, sp.n. a, 

 style, X 240; b, end of typical tornote, 

 X 500; c, sigmata, x 500; d, chelae, x 500. 



Fig. 27. Myxilla verrucosa, sp.n. a, styli, and modifications, 

 X 300 ; b, tornota, showing variation in shape of ends, x 300 ; 

 chelae, x 500. 



Myxilla verrucosa, sp.n. (Fig. 27). 

 Holotype. B.M. 28. 2. 15. 82S. 

 Occurrence. St. WS 243 : north-east of Falkland Islands, 144-141 m. 



Diagnosis. Sponge small, irregularly massive; surface uneven, verrucose; texture 

 friable ; oscules and pores not apparent ; colour, in spirit, greenish grey ; main skeleton 



