Sponges from the Atlantic Ocean. 4()5 



expanded liy the retriictiuu of the sareude and elevation of the 

 raaiated tlcsh-spicules into a conical form. This is well repre- 

 sented in ►Sciunidt's figure 7, />, Taf. iii. (Atlantisch. Spongienf. 

 1870). 



]\Iy reason for retaining Dr. Gray's generic name of " J/aca«- 

 dreiriti^^^ and rejecting Dr. Bowerbank's sub.sequent one of 

 " D(tcti/lucnli/£^^^ can, from what has been a])ove stated, be easily- 

 understood, liesides, what student of the Invertebrata would 

 not wish to remember the name of the late Mr. !MacAndrew ? 



A single specimen of this sponge was dredged up on board 

 the * Porcu)>ine,' and, although factured and much more irre- 

 gular in its growth than the typo specimen in the British 

 ^luseuni, was, generally (as the fragments arc present and can 

 be put together), of the same form, being about 4^ inches in 

 diameter across the brim by 3 inches deep, and about tV of an 

 inch thick in the walls. It is in the same jar with the dead 

 fragments of CoraUistes Bowerhankii, on which, as before 

 stated, are the numbers " 25, 75, 374 fathoms." Having 

 been taken while living, its structure is in all respects like 

 that of the type specimen above mentioned. 



There are also two or three other small fragments of this 

 sponge diy and without number, which, having been taken 

 dead and much worn by attrition, only show the characteristic 

 groups of vents, which become exposed, as before stated, when 

 the dermal layer has been worn off. Were I to assign any 

 peculiarity to the form of the filigrecd S])icule of Mucandreivia 

 azorica, 1 should say that the tubercles of the branches had a 

 tendency to assume the form of conical, slightly curved prongs, 

 something like those on the antlers of a stag. 



Good rigures of the spicules of this species may be seen in 

 Dr. Bowerbank's illustrations of it (Proc. Zool. Soc. 1869, 

 pi. iv. fig. 5, pi. V. figs. 1-5), together with fig, 6 in pi. xxiii,, 

 which, by accident, has been figured as belonging to the 

 hexactinellid sponge ^^ Iphiteon callocyathes, Bk. 1809," = 

 Myliusia caUocyathes, Gray, 1859. No doubt the spicule of 

 Macnndreicia azorica, thickly covered by its peculiar fiesh- 

 s])icule, got by accident into the mounted preparation of 

 Iphiteon calloci/athes, and thus was drawn as a j/art of the 

 latter, just as a ])ortion of Macandrewia a.zorica got by acci- 

 dent into my mounted specimen of CoraUistes Boicerbankii as 

 before stated, and led me into a similar error, viz. that of 

 adding to the latter the fiesh-spicule of ^facandre^cia azorica^ 

 an error which I have now corrected. This shows how par- 

 ticular we shtjuld be in our mountings, or, at all events, in 

 identifying the spicules which they may contain with those 

 only belonging to the sponge we wish to illustrate. 



