450 Mr. II. J. Carter on Sjjecimens 



the spire by the stolonic siphon mentioned (fig. 6, c) . Surface 

 of the chamber smooth, indistinctly microspinate and micro- 

 punctate (fig. 6, e). Size of the group about l-36th inch in 

 diameter. 



Hah. Marine, in minute cavities of the Melobesian nodules, 

 which have been excavated by lithodomous sponges. 



Loc. Gulf of Manaar. 



Obs. Besides the specimens which come from the cavities 

 above mentioned in the Melobesian nodules, I possess pieces 

 of old Stylaster sanguineus from the South Pacific Ocean 

 bearing several specimens on the surface (fig. 6,/). Like 

 the last chamber in the figured specimen from the Gulf of 

 Manaar, which has put forth two stolonic knotted tubular 

 filaments and was in the act of putting forth more (fig. 6, dd), 

 some of those on the surface of the Stylaster coral are con- 

 nected with a similar filament. How far the chambers of 

 those from the Gulf of Manaar were originally arranged to- 

 gether in juxtaposition and spirally I am not able to state, 

 further than that their forms indicate it, since to see them 

 satisfactorily it was necessary to dissolve them out of the 

 Melobesian substance with acid and mount them in Canada 

 balsam, during which the chambers became separated. 



Ceratesfina tessellata, n. sp. 

 (PI. XIX. fig. 7, a-h.) 



Test lobular, adenoid, connected with a crooked, knotted, 

 stolonic filamentous tube. Consistence horny. Colour dark 

 amber (PI. XIX. fig. 7, a, b). Developed upon a stolonic 

 tubular filament in a globular form (fig. 7, c), which, becoming 

 multiplied as the mass increases in size, passes into a lobu- 

 lated group whose walls are traversed by straight unbranched 

 lines of fibre intersecting each other at various angles, and thus 

 giving the surface a meridionated or tessellated appearance 

 (fig. 7, d) , not rising above the level of the outer surface, but 

 sending inwards processes which in the living state may 

 have supported delicate partitions, and thus have rendered the 

 interior multilocular (fig. 7,f). External surface of the wall 

 smooth, with the exception of microscopic points which are 

 sparsely scattered over it (fig. 7, h). Stolonic tubular fila- 

 ments, which are often knotted (that is, bearing several suc- 

 cessive dilatations and here and there conical processes indi- 

 cative of budding development), hollow, and characterized 

 throughout by the tessellated fibrous structure above described, 

 only in a less visible degree (fig. 7, g). Size of largest group 

 or specimen l-25th by l-45th inch in its greatest dimen- 

 sions. 



