232 SPINTHER MINIACEUS. 



2. Spintheii miniaceus, Grube, 1860. Plate XXIV, figs. 1, 2. 



Specific Characters. — Parapodia without cirri ; the dorsal lamellae are prominent 

 processes with leaf-like external borders. The supporting bristles are bifid and more 

 slender than in the previous species, and arranged in a radiate manner in the leaf-like 

 lateral lobes. The distal end of the shaft of the hook is smooth. The ventral surface 

 appears to be smooth, but it has rows of minute warts. 



Synonyms. 



1850. Oniscosoma arcticum, Sars. JSIyt. Mag. f. Naturvid., vol. vi, p. 240 (210 Sars' paper). 



1860. Spinther miniaceus, Grube. Arcniv f. Naturges, Jahrg. 26, Bd. i, p. 74, Taf. 3, figs. 3 — 3 b. 



1861. „ „ Grube. Ein Ausflug nacli Triest, pp. 31 and 140, Taf. 3, figs. 3—3 b. 

 „ „ arcticus, Sars. Sasrsk. aft. Vidensk. Forfchandl., p. 3. 



1862. „ „ Sars. Christiania Yidensk. Selsk. Forhandl., p. 52. 

 1867. „ „ Malmgren. Annul. Polychaet., p. 1. 



1876. „ oniscoides, Mcintosh. Traus. Z. S., vol. ix, p. 373, pi. lxvii, figs. 1 — 3. 



1879. „ arcticus, Tanber. Annul. Danic, 77. 



1883. ,, ,, Levinsen. Yidensk. Meddelelser; Kjobenhavn, p. 125. 



1884. ,, miniaceus, J. Y. Carus. Prodr. Faunas Medit., p. 208. 



1885. ,j „ Drasche. Beitrage zur Anat. Polycliast., Heft. 1, Taf. ii, Wien. 

 1887. „ „ Graff. Zeitsch. f. w. Zool., vol. xlvi, p. 93, Taf. i — v, and woodcuts. 



1890. „ „ Mcintosh. Ann. Nat. Hist., Aug., 1890, p. 182. 



1891. ; , oniscoides, Hornell. Trans. Liverp. B. S., p. 239. 



1896. ,, miniaceus, Racovitza. Arch. Zool. Exp., p. 197, pi. hi, figs. 22 — 26. 



Habitat. — The Minch, near North Uist, on a yellowish sponge (Mcintosh) ; on 

 Antennularia ramosa and yellow Halichondria in seventeen fathoms off Holy Island, 

 Anglesey (Hornell). Finmark and west coast of Norway ; Bay of Muggia at Trieste on 

 reddish sponges (Tedania) ; north coast of Denmark (Lutken). Stimpson (1853) found 

 the American example of the genus also on a yellowish sponge. 



Colour. — The Hebridean specimen was of a straw-yellow hue, the lamellar processes 

 at the side being pale and marked with opaque-white spots. The Mediterranean examples 

 are of a cinnabar tint, or dull reddish, brownish, or violet-brown, according to the colour 

 of the sponges which they frequent. 



Head. — The caruncle presents no feature of interest. The exserted pharynx is 

 smooth and trumpet-like, thus diverging from the condition in S. arcticus. 



Body. — Ranging from "9 to 8*5 mm., the Hebridean example being about 5 mm., with 

 a thickness in the centre of 1 mm. in the largest, ovate or somewhat oblong, with the 

 sides flanked by the translucent lamellse, which dorsally form a series of symmetrical 

 processes provided only with bifid bristles, and in the largest examples 0*4 mm, in 

 height. The lamellae on the two sides of the body are separated by a median furrow. 

 Ventrally the surface is more or less smooth, only minute warts being present, and there 

 is no well-defined median furrow. This surface is covered with areola (polygonal spaces) 



