240 Mr. A. Hancock on new Species of Excavating Sponges. 



crowded and confused, composed of numerous series of irregular 

 elongated lobes about -^ inch wide, which communicate with 

 each other by constricted stems ; papillae not numerous, varying 

 in size, the largest about -pV ii^ch wide. Spicula of two kinds : 

 one, -i-^ inch long, is pin-like, unusually stout, mostly a little 

 bent, with the head terminal, broadly ovate, the wide extremity in 

 connexion with the shaft ; the other form, which is scarcely one- 

 fourth the length of the pin-like kind, is rather stout, cylindrical, 

 arched, worm-like, undulated frequently three or four times, with 

 the extremities obtuse. Both kinds are numerous. 



Two specimens of this well-marked species have occurred, 

 both in a species of Chama in my cabinet. The spicula are very 

 characteristic. I have met with no other species which has the 

 undulated or worm-like kind ; and the stout shaft and broadly 

 ovate head of the pin-like form are very striking. The surface 

 of the excavations is strongly ehagreened, and exhibits a few 

 scattered punctures. 



Cliona Mazatlanensis. PI. VIII. fig. 1. 



Sponge, when dried, of a soiled brown or pale drab-colour, 

 made up of a vast number of minute lobes about -j-V inch wide, 

 irregularly rounded, united by very short constricted stems, and 

 so crowded that the mode of branching is perceptible only at 

 the margin of growth, where it is seen to be dichotomous, the 

 terminal twigs being rather short, delicate, and obtuse; papillse 

 very numerous and minute, distributed without apparent order, 

 J^ inch wide ; there are a few larger ones scattered amidst the 

 others, and about three times their size. Spicula of three kinds : 

 the first is pin-like, -pfr i^^ch long, with the shaft straight, deli- 

 cate, and gradually tapering to a fine point at one end, the other 

 exactly terminated by a large oval head, within which a cavity is 

 distinctly seen ; the second kind is fusiform, about half the 

 length of the former, most minutely spined, pretty regularly 

 arched, and with both ends sharply pointed ; the third form is 

 quite minute, not more than ttW ii^ch long, cylindrical, sharply 

 bent in the centre, roughened or minutely spined, and with the 

 extremities obtuse. 



I have seen but one specimen of this species : it has overrun 

 the entire surface of a Purpura from Mazatlan, presented to the 

 Newcastle Museum by Dr. P. P. Carpenter, The surface of the 

 burrow is strongly shagreen ed. 



Cliona glohulifera. Plate VIII. fig. 3. 



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

 numerous globules or rounded lobes, about j- inch wide, united 

 by short, cylindrical, more or less constricted stems, and so 



