AOANTHICOLEPIS ASPERRIMA. 311 



Genus XII. — Aoanthicolepis {Norman MS.); 1 Dasylepis, Malmgren, 1867. 



Body elongate-oblong or sublinear. Head produced anteriorly into two pointed lobes 

 on each side of the median tentacle, below the base of which the lateral tentacles spring. 

 Byes as in Eunoa. Scales eighteen pairs, coarsely spinous, overlapping each other 

 and covering the entire dorsum. Dorsal bristles stronger than the ventral, tapering 

 from the middle to the tip. Yentral bristles with short, bare, hooked tips, above the 

 spinous rows, with a minute secondary process in some towards the upper third of the 

 series. Segmental eminence distinct, papilla somewhat long and slender anteriorly, short 

 posteriorly. 



Aoanthicolepis asperrima, Sars, 1860. 



Specific Characters. — Body rather broad and thick, tapered slightly anteriorly, and 

 still more posteriorly. Segments about fort}^-one. Byes large, visible from the dorsum, 

 two in front of the nuchal fold, and two somewhat lateral in position about the middle 

 of the head, or perhaps a little anterior to it. Palpi of moderate length (in spirit), with 

 minute cylindrical papillae. The other appendages of the head have a slight enlargement 

 below the long tapering tip, the region above and below the enlargement having long 

 cilia. Tentacle and dorsal cirri similar. The ventral cirri are of moderate length, and 

 have short cilia. Scales eighteen pairs ; the first pair rounded, the rest more or less 

 reniform, roughened, with long and strong horny spines, especially towards the free 

 border. The tips of the spines are often bifid. 



Habitat. — The only British locality seems to be the Frith of Clyde, where it was 

 obtained by the veteran naturalist of that region, Dr. D. Robertson. It ranges to 

 Norway, where it was procured by Sars, and lately by Canon Norman in his productive 

 dr edgings. 



Synonyms. 



1860. Polynoe asperrima, Sars. Forh. Vid. Selsk. Christ., 1860, p. 59. 

 1865. Lepidonotus pharetratus ? Baird. Johnst. Cat., B. M. Suppl., p. 340. 

 1867. Dasylepis asperrima, Malmgren. Ann. Polych.,, p. 7. 

 1873. „ „ Sars. Bid. Christ. Faun., p. 2. 



1876. „ „ Mcintosh. Trans. Z. S., ix, p. 374, pi. lxvii, f. 9— 11. 



1879. „ „ Tauber. Ann. Danic, 82. 



1883. „ „ Levinsen. Nord. Annul. Vidensk. Meddel. f. d. Nat. For. i Kiobenhavn, 



188 and 195. 



The length of the example in the British Museum is about an inch. 



The head (Plate XXVII, fig. 6) is somewhat longer than broad, with a well-marked 



1 As the title Dasylepis has been pre-occupied by Pander for a Silurian Ganoid (1856), the 

 name suggested by Canon Norman, viz. Aoanthicolepis, may be substituted. 



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