REPORT ON THE CALCAREA. 25 



2. Grantia, Fleming 1 (sensu mutato). 



Syconidse with articulated tubar skeleton, with radial tubes which have lost every 

 trace of individuality, owing to the formation of a cortex, which is quite independent, 

 however thin, its skeleton consisting mainly of triradiate spicules. 



I include in this genus the following species : — 



Grantia strdbilus, H. 

 cupula, H. 

 Icevigata, H. 



Grant ia perforata, H. 

 compressa, F. 

 tuberosa, n. sp. 



3. Ute, 0. Schmidt 2 (sensu mutato). 



Syconidse, the skeleton of whose strongly developed cortex consists principally of 

 large acerate spicules, lying in several layers parallel to the outer surface. 



There are at present only two forms which belong to this genus : — 



Ute glabra, S. Ute argentea, n. sp. 



The main character distinguishing these two species is found in the properties of 

 the tubar skeleton ; in one case it is articulated, in the other non-articulated. This 

 character is used by me with reference to the genera Grantia and Amphoriscus as 

 a generic distinction, and of course it is possible that Ute argentea stands to the genus 

 Amphoriscus in the same relation as Ute glabra to the genus Grantia; but so long 

 ;is the embryology of Ute argentea is not known, there being no intermediate stages 

 to decide the cpiestion, both the species must be united in one special genus since their 

 main character so sharply differentiates them from all other Syconidas. 



4. Iletcropegma? n. gen. 



Syconidse with articulated tubar skeleton, the skeleton of whose strongly developed 

 cortex, consisting of triradiate and quadriradiate spicules, is quite different from that 

 of the parenchyma with respect to their size. 



The tubar skeleton of this genus being articulated, it cannot be denied that the 

 differences dividing Het&ropegma from Grantia are quantitative rather than qualitative 

 in nature. Yet the distinctions are great enough, and I am still more inclined to regard 



1 HUt. of Brit. Anim., p. 524, 1824. 2 Spong. d. adriat. Meeres, Suppl. 1, p. 23, 18G4. 



:l From him; — different, and irijy^a — framework, skeleton. 



(ZUOL. CliALL. EXP. — 1'AUT XXIV. 1883.) .\ i I 



