STAUROCEPHALUS RUBROVITTATUS. 353 



1. Staueocephalus rubeovittatus, Grubs, 1855. Plate LV, fig. 1; Plate LXT, figs. 7- 

 7 c— teeth ; Plate LXXIII, figs. 4-4 a— feet ; Plate LXXXI, figs. 9 and 9 a— -bristles. 



Specific Characters. — Head somewhat rectangular, with four brownish-black eyes, 

 the anterior considerably larger than the posterior and wider apart. Two short clavate 

 (four-ringed, Grube) tentacles arise between the eyes of each side, and extend nearly to 

 the anterior edge of the snout. Two curved or sickle-shaped thick palpi (sub-tentacles, 

 Grube) spring below the snout. A slight fillet occurs on each side of the head 

 posteriorly. Head and appendages pale. 



Body somewhat fusiform, with fifty-three or more bristled segments, tapered 

 from the anterior third forward, and from rather more than the posterior third backward 

 to the tail, which ends in two short cirri, two longer being in front of them (Ehlers). 

 First two segments devoid of feet. The first is fine rose-red, the second is paler. Two 

 bars of the same colour on each segment. Ground-tint of the body is flesh or cream- 

 coloured. The mouth has two lips. The dorsal dental apparatus consists of a double 

 row of horny teeth which are pinnate, the median fang of the dorsal series in front 

 being prolonged into a slender process. The lower row is the stronger, is dark brown, 

 and has about twenty to twenty-one teeth. 1 The upper row has ten to twelve teeth 

 which are well developed. The mandibles are club or wedge-shaped, the broad anterior 

 edge being coarsely crenate. The foot has a stout dorsal cirrus with a terminal articu- 

 lation which projects beyond the tip of the setigerous region. A slender spine occupies 

 its middle. Setigerous lobe large, dorsal ridge ciliated, and the free border split 

 superiorly into two conical processes, and with convex edges inferiorly. The ventral 

 lobe projects beyond the adjoining part of the setigerous lobe. A single translucent 

 spine is present. The upper bristles are transparent, gently widening upward and 

 forming a flattened blade with a serrated edge. Lower bristles equally translucent, 

 curved, dilating at the distal end of the shaft, which is bevelled, and articulates with 

 a bifid terminal piece, the secondary process being separated by a considerable interval 

 from the terminal hook. 



Synonyms. 



1855. Staurocephalus rubrovittatus, Grube. Arch. f. Naturges., xxi, p. 97, Taf. iii, f. 9. 



1860. „ „ idem. Ibid., xxvi, p. 78. 



1861. „ „ idem. Ausfhig nach Triest, pp. 24 and 140, pi. 1, f. 10 and 11. 



1864. „ ,, idem. Die Insel Lussin, p. 80. 



1865. „ erucseformis, Malmgren. Nord. Hafs-Annul., p. 184. 

 J} „ rubrovittatus, De Quatrefages. Annel., ii, p. 83. 



1866. Dorvillea lobata, Parfitt. Zoologist, 2nd ser., vol. i, p. 113. 



1867. „ „ idem. Trans. Devon Assoc, ii, p. 23 (sep. copy). 



„ Staurocephalus erucseformis, Malmgren. Annul. Polych., p. 62, Taf. viii, f. 50. 



1868. Staurocephalus erucseformis, Ehlers. Borstenw., p. 424, pi. xviii, f. 1 — 16. 



1875. „ rubrovittatus, Marion and Bobretzky. Ann. Sc. nat., 6 e ser., tome ii, p. 10. 



1879. „ erucseformis, Langerhans. Zeitschr. f. wiss. Zool., xxiii, p. 299. 



1885. „ rubrovittatus, Pruvot. Arch. Zool. exper., 2 e ser., t. iii, p. 274, pi. xi, f. 4; 



pi. xii, f. 10—13. 



1 Grube gives twenty-eight and twenty-one respectively. 



102 



