-'352 5IR. ALBANY HANCOCK ON 



C. globuUfera. PI. XVII, fig. 2. 



Sponge of a pale clear yellow colour when dry ? composed of 

 numerous globules or rounded lobes about one-fifth of an inch 

 wide, united by short, cylindrical more or less constricted stems, 

 and so crowded that the usual dendritic character is scarcely dis- 

 cernible ; the terminal twigs are excessively short, and there are 

 very few spine-like processes : papillse few and large, measuring 

 sometimes as much as -^-ths of an inch in diameter. Spicula pin- 

 like, -gVth of an inch long, usually straight, occasionally a little 

 bent, tapering gradually to the pointed extremity ; the head oval, 

 mostly placed a considerable way from the end, which is rounded ; 

 frequently the head is almost obsolete, sometimes is entirely want- 

 ing, and two heads are not by any means uncommon, one placed 

 a little below the other. 



A finely developed specimen of this species has penetrated the 

 shell of Sponclylus gmcleropus, from the Mediterranean. It is 

 allied to C. celata as is evinced by their being only one kind of 

 spiculum, and that pin-like. The form of this organ is however 

 sufficiently characteristic ; but perhaps the colour of the sponge, 

 the delicacy of its texture, and the lobulated mode of its growth, 

 are the best distinguishing features. 



C. Carpenteri. PI. XVII, fig. 4. 



Sponge when dry of a pale yellowish colour, formed of numer- 

 ous, crowded, angulated lobes, scarcely -^-ths of an inch wide, 

 each united to its neighbours by two or three short, much con- 

 stricted, cylindrical stems : papillse about aVth of an inch in dia- 

 meter, not very numerous, varying little in size, and scattered 

 without apparent order. Spicula of three kinds : the first pin- 

 like, T Joth of an inch long, straight, slender, rarely a little bent, 

 with the head distinct, perfectly globular, and exactly terminal : 

 the second kind, which is half the length of the first, is fusiform, 

 unusually stout, with occasionally an indistinct narrow nodule 

 in the centre, where'" it is suddenly bent ; the extremities are 

 very sharply pointed : the third form is very minute, being only 

 TToVoth of an inch long; it is usually straight, slightly fusiform, 



