252 



tornote, and not styles with a tornote point such as Bowerbank 

 figures. 



The specimen is crowded in parts with small developing 

 seed-like embryos, solitary or in clusters, each coated with a 

 special layer of spined styles, more slender and less spined than 

 the spicules of the general network. 



Locality B. — Cape St. Blaize, 45 fms. ; bottom, fine sand. 



Distribution. — Great Britain, West Indies, South Africa, 

 Falkland Islands. 



Genus Desmacidon (Bowerbank). 

 Desmacidon ramosum (Ridley and Dendy). 



1886. Desmacidon (f) ratnosa, Ridley and Dendy [14, p. 346]. 



1887. Desmacidon (?) ramosa, Ridley and Dendy [15, p. 107, pi. xxiii. fig. 4-4C, 



pi. xxiv. fig. 4, pi. xlvii. fig. 6]. 



One small cylindrical fragment. 



Locality C. — Off Tugela River mouth, 65-80 fms. ; hard 

 ground. 



Distribution. — South of Cape of Good Hope, 150 fms., and 

 Marion Island, 50-75 fms. ("Challenger"). 



The collection contains one small cylindrical fragment. 

 Although the skeleton approximates more to a radial than to 

 a reticulate type, yet a certain amount of reticulation is present ; 

 accordingly the specimen is here definitely placed in the genus 

 Desmacidon. 



Desmacidon grrande (Ridley and Dendy). 



1886. Homoeodictya ^randis, Ridley and Dendy [14, p. 347]. 



1887. Desmacidon grandis, Ridley and Dendy [15, p. in, pi. xxii., pi. xxix., 



figs. 7, 7a]'. 



This collection includes a fine series of specimens of this 

 species, showing interesting variations in form. 



All expand from a short thick rounded stem into a thin soft 

 flabellate growth. In some the flap is entire, in others the 

 margin is continued into flat digitate flaps longer than the 

 undivided basal portion. 



The largest specimen is 40 cm. high and 32 cm. broad. 



The type specimen obtained by the "Challenger" from 

 Simon's Bay has a much smoother surface and more clearly 

 defined oscules than any of the present series, the surfaces of 

 which are strongly tufted. A well-marked umbo is usually 

 (and not exceptionally) present at the centre of the concavity 

 of the keel of the isocheles in Dr. Gilchrist's specimens. 



