400 XOTOCIRRUS SCOTICTTS. 



Grube in 1871 instituted tlie genus Maclovia for De Quatref age's Lumbriconereis 

 gigantea, and in his later publication (1879) adheres to the genus, distinguishing it from 

 Arabella by the presence in the latter of only four pairs of jaws. In Maclovia, again, 

 Grube assigned four large basal teeth to the first pair of jaws (Kieferpaares), whereas in 

 such forms as Verrill's Arabella opalina the four basal teeth of the first pair are small. 



The Arabella opalina of Verrill, which Treadwell 1 also found at Porto Rico, seems to 

 be a closely related form common on the American coast, where formerly Leidy termed 

 it Lumbriconereis splendid a, 2 Webster and Benedict found it at low water in sand. 3 



The note on the synonymy of this species by Dr. Willey, 1900, did good service in 

 drawing attention to the confusion on the subject, especially in connection with the 

 supposition that Notocirrus scoticus, McL, was the same species. The two forms are 

 readily discriminated by the naked eye. 



Genus LXVII. — Notocirrus, Schmarda, 1861. Char, emend. 



Head rounded and devoid of appendages. Eyes present or absent. Body firm, of 

 moderate length, deeply segmented so as to be more or less moniliform. Maxillae with 

 long fangs ; four pairs of jaw- plates, the first with uniformly toothed edge, the second 

 dissimilar ; very long posterior processes. Mandibles pointed posteriorly. Foot with a 

 stumpy rounded dorsal and ventral cirrus. Bristles simple, with short tips and broad 

 wings. 



Ehlers 4 describes this genus as having a rounded naked head. Foot with a stumpy 

 rounded dorsal and ventral cirrus, simple bristles with sparsely toothed wings. Upper 

 jaw with long fangs, four pairs of jaw-plates, the first with uniformly toothed edge 

 and without end hook, the second dissimilar. 



Claparede (1868) observed that De Quatrefages considered the absence of eyes 

 diagnostic, yet two species he described were furnished with four. Then he did not 

 think the presence of a dorsal cirrus of much differential weight in connection with 

 Lumbriconereis. On the other hand, the cirrus or tubercle sometimes representing it 

 always had a group of small spines. These are absent in the Lumbriconereids. He 

 evidently included Arabella as a chief type, and thus his views differ from those in 

 the present work. 



1. Notocirrus scoticus, Mcintosh, 1869. Plate LXII, figs. 9-9 I — body and teeth; Plate 

 LXXIV, figs. 6 and 6a— feet; Plate LXXXIII, fig. 3— bristles. 



Specific Characters.— Bead acutely conical with two distinct eyes at its posterior 

 border. Body about 3 ins. long, of a general reddish-brown colour, and less iridescent 



1 < Journ. Acad. Nat. Sc. Philad./ vol. iii, p. 147. 



2 < Eep. U. S. Comm. F. and F./ 1884, p. 721 ; and Webster, < 32nd Ann. Rep. X. York Mas./ p. 

 116, 1879. 



3 < Eep. IT. S. Comm. F. and F./ 1901, p. 199. 



4 'Borstenw./ ii, p. 406, 1868. 



