POLYOPHTHALMUS PICTUS. 21 



Habits. — Like its congeners this species is an active inhabitant of muddy sand, and it 

 swims through the water swiftly, like an eel. 



The Armaudia Dollfusi of De St. Joseph 1 has a long filiform process (tentacle, De St. 

 Joseph) at the tip of the snout, and the anal funnel also differs, though both have two 

 longer ventral cirri, and the dorsal slit of the caudal region is carried forward. It also 

 appears to differ from Kukenthal's A. potyophthalma, as described by him and Lo Bianco, 

 in the anal funnel and other parts. 



This form likewise differs from Armandia intermedia, Fauvel, 2 in having no long 

 unpaired cirrus between the longer ventral pair of cirri. 



Genus LXXXIII. — Polyophthalmus, De Quatrefages, 1850. 



Head short, rounded, with a vertical fissure on each side for the protrusible nuchal 

 organ, infundibulariform in outline, and with a folded margin. Buccal segment with 

 bristles. Exsertile pharynx patelliform. Body smooth, ventral region separated from the 

 lateral by a groove, the middle region having ventro-lateral eyes with a single crystalline 

 body, slightly diminished posteriorly, and ending in an anus with cirri. No branchiae. 

 Minute capillary bristles ventro-lateral in position. 



Mario Lessona 3 in 1883 gave the anatomy of Poly ophthalmitis. 



The close relationship of Polyophthalmus with the Opheliidas was pointed out both 

 by Filippi 4 and Grube. 5 



1. Polyophthalmus piotus, Dajardin, 1839. Plate LXXXVIII, fig. 2; Plate C, fig. 11 — 



foot and bristles. 



Specific Characters. — Head bluntly rounded, with well-marked nuchal organs, and 

 occasionally a pigment-speck on each side in front of the nuchal brown band. Body 

 about an inch in length, elongated, somewhat fusiform, rounded dorsally, and grooved 

 ventrally, the ventral longitudinal muscles being prominent. Segments, about thirty, 

 biannulate. Posteriorly it tapers to the abruptly diminished caudal process, which forms 

 a short cone with a few short terminal cirri. Dorsum marked by about thirty transverse 

 bars of brown, with a fine dusting of the same pigment between and beyond them. Along 

 the lateral groove is a single series of pigment-spots symmetrically arranged. Some of 

 Claparede's examples were brownish green. 



Synonyms. 



1839. Nais picta, Dujardin. Ann. Sc. nafc., 2 e ser., t. xi, p. 293, pi. vii, figs. 9 — 12. 



1850. Polyophthalmus p*ictus, De Quatrefages. Ann. Sc. nafc., 3 e ser., t. xiii, p. 11, pi. ii, figs. 1 — 15. 



1 'Ann. Sc. nat./ 7 e ser., xvii, p. 114, pi. vi, figs. 148—151. 



3 ' Bull. Soc. Linn. Normaudie/ 5 e ser., 5 e vol., p. 86, text-figs. 29 and 30, 1902. 



3 ' Mem. Accad. Torino/ ser. 2, t. xxxv, 1883. 



4 { Archivio per la Zoologia, lAnatomia/ etc., Grenova, 1861, p. 315. 



5 c Ausflug nacli Triest/ etc., p. 49 ; and c Arch. f. Naturg./ xxix, 1865, p. 49. 



