REPORT ON THE HEXACTINELLIDA. 341 



(PI. XCVIII. fig. 10), and also the singular spicules already described by Marshall 

 as aberrant broom-forks (Besengabcln), which indeed resemble the scopulse in many 

 respects, though not agreeing with them completely. The somewhat rough straight 

 shaft, which runs out at one extremity into an abrupt point, is more or less richly 

 beset with rough finger-like or conical teeth of variable size, and perpendicularly inserted. 

 On the other somewhat thickened extremity it bears four, more rarely five or three, 

 rough finger-like terminal rays, which diverge more or less markedly, and are, as a rule, 

 slightly curved {PI. XCVIII. figs. 7, 8). 



It is improbable that the floricome-like hexacts with spherical terminal knobs, which 

 are to be found in the dried specimens here and there between the beams of the network 

 of the dictyonal framework, are to be regarded as parenchymal spicules. I am rather of 

 opinion that they are accidental additions to the parenchyma, and derived from the skin. 



Tribe II. INERMIA, F. E. Schulze (Pis. XCIX.-CI. ; Pis. CIII., CIV.). 

 Dictyonina without uncinates and scopulte. 



Family M^ANDROSPONGiDJi:, Zittel (Pis. XCIX.-CI. ; Pis. CIII., CIV.). 



The body consists of a system of rounded, anastomosing tubes of tolerably uniform 

 calibre, with a system of cavities between. Through the latter the water reaches the 

 interior, passing through the wall of the tubes, and is passed out through their lumen 

 either into the gastral cavity or directly to the exterior. 



Genus 1. Dactylocalyx, Stutchbury (Pis. XCIX., C). 



1780. Rozier, Journal de Physique, October, t. xvi. p. 315, pi. i. 



1781. Lichtenberg, Magaziu fiir das Neueste aus dor Physik und Naturgeschichte, Gotha, 1781, 



Bd. i. pp. 68, 69. 

 1841. Stutchbury, Proc. Zool. Sec. Lond., vol. ix. p. 86; Ann. and Mag. Nat. Hist., ser. 1, 

 vol. ix. p. 504 {DadylocaliiK pnmiceus). 



1858. Bowerbank, Phil. Trans., vol. cxlviii. p. 279. 



1859. Gray, Proc. Zool. Soc. Lond., vol. xxvii. p. 437 ; Ann. and Mag. Nat. Hist., ser. 3, 



vol. V. p. 495 (Macandrewia). 



1860. Max Schultze, Hyalonema. 



1861. Ehrenberg, Monatsber. d. k. preuss. Akad. d. Wiss. Berlin, vol. i. p. 448. 



1862. Bowerbank, PhO. Trans., vol. clii. p. 747. 



1863. Johnson, Proc. Zool. Soc. Lend., p. 257; Ann. and Mag. Nat. Hist., ser. 3, vol. xiii. p. 257. 



1864. Bowerbank, Monograph of the British Spongiadoe, vol. i. 

 1864. KulLiker, Icones hist., Protoz. 



1867. Gray, Proc. Zool. Soc. Lond., p. 492. 



1868. Gray, Ann. and Mag. Nat. Hist., ser. 4, vol. i. p. 161. 



