262 SPIROGRAPHIS SPALLANZANTI. 
and taper distally. They have a translucent skeletogenous support internally. The filaments 
are long and with a strong tendency to spiral coils (six and a half as a rule). They 
are coloured brown, white, violet, and orange—forming successive zones; sometimes uniformly 
coloured, or pale. The body is long, and slightly flattened both dorsally and ventrally, 
though less so than in Bispira, measures six to twelve inches, is of nearly equal diameter 
in the preparation till near the tail, where it is diminished to a blunt point. The segments 
are well marked, somewhat broader in front and narrower behind, where the segments are 
corrugated and marked by a median furrow. ‘The thoracic region has eight segments, the 
dorsal bristles of opposite sides, as in its allies, approaching each other more closely. The 
copragogue passes dorsally behind the eighth bristle-tuft on the right. The colour of 
the body is dull brown on the ventral surface, greyish dorsally. A spot of white occurs at the 
ventral end of the thoracic tori, and at the dorsal end of the abdominal tori. The bristles 
are brownish by transmitted light, golden by reflected. The first tuft has more slender shafts, 
and tapering tips with narrow wings, the curve at the tip being shght, and the same type 
continues to the eighth. Posterior bristles in brush-like fascicles, with shorter tips and 
broader wings. Hooks typically Sabellid, the anterior considerably larger than the posterior. 
The serrations on the edge above the chief fang are very fine, the prow is rounded and the 
space above it larger, thus differmg in the more elongated neck, the distinct serrations on 
the crown and the longer and bolder striz of the body from those of Baspira. Moreover, 
the occurrence of the short bristles with the broad paddle-like tips in the thoracic tori is 
a feature of moment. 
Tube greyish, covered with sand-particles. 
SYNONYMS. 
1558. Pinceaw de mer, Rondeletius. Lib. ii des poissons, p. 76. 
1755. Corallina tubularia melitensis, Ellis. Corallines, p. 92, pl. xxxiu. 
1766. Nereis lutaria, Pallas. Misc. Zool., p. 116, Tab. x, fig. 1. 
1767. Sabella penicillus, Linneeus. Syst. Nat., Edit. xii, p. 1269. 
1802. es a Viviani. Journ. de Phys., ann. 1803, p. 321. 
1805. Spirographis spallanzani, idem. Phosphor. Mar., p. 14, pls. iv and vy. 
1818. Amphitrite ventilabrum, Lamarck. Hist. Anim., t. v, p. 356. 
1820. Sabella Savigny. Syst. Annel., p. 81. 
ps ‘ unispira, idem. Ibid., p. 80. 
»  NSptrographis spallanzani, Schweigger. Handbuch Nat., p. 600. 
1826. Amphitrite ventilabrum, Risso. Hist. Nat. Hur. Mérid., t. iv, p. 410. 
., se Josephine, idem. Ibid., t. iv, p. 410. 
1830. E. penicillus, Bosc. Hist. Nat. Vers., vol. iii (2nd edit.), p. 199. 
»  Sptrographis spallanzani, Cuvier. Régne Anim., t. iii, p. 193. 
»  NSabella umspira, idem. Ibid., pl. iv, fig. 1. 
1838. ? Amphitrite ventilabrum, De Blainville. Dict. Sc. nat., art. vers, p. 434. 
3 oP spallanzani, idem. Ibid., p. 434, pl. ii, fig. 5. 
»  NSabella unispira, Grube. Anat. Kiemenwiirmer, p- 24. 
1841. »  ventilabrum, Delle Chiaje. Descriz., t. ii, p. 71. 
1846. » Josephine, Grube. Arch. f. Naturges., p. 53, Taf. ii, fig. 6. 
1851. me ventilabrum and spallanzani, idem. Fam. Annel., p. 88. 
3 yp unisptra, Williams. Rep. Brit. Assoc., p. 193, etc. 
es RA idem. Ann. Nat. Hist., 2nd ser., vol. xii, p. 395. 
