1112 BRITISH CAMBRIAN TRILOBITES. 



to ray notes made at the time, the head was semicircular but broken, and the thoracic 

 segments were as in Angelina sedgwicki except that posteriorly the spines seemed 

 to be somewhat larger. The principal difference from that species la}* in the tail, 

 which was entire instead of spinose. This is the only specimen from abroad 

 known to me which can be referred with any confidence to Angelina. 



Salter looked upon the genus as intermediate between Olenus and Conocon/phe 

 (a name which he used as equivalent to Barrande's Conocephalites), and the 

 characters to which he seems to have attached most importance are the absence 

 of glabellar furrows and of ocular ridges and the grooved and faceted pleurae, 

 which are bent down at the fulcrum, though not so strongly as in Gonocephalites. 

 The pleurae are not unlike those of Beltella,, and in that genus glabellar furrows 

 seem to be absent on the surface of the test, though they sometimes appear on the 

 cast. In Beltella the ocular ridges are ill-defined, but they are not entirely 

 absent. On the whole, Beltella seems to be the genus most closely allied to 

 Angel iiia, but it has only twelve thoracic segments instead of fifteen, and the 

 anterior branches of the facial sutures are much more divergent. According to 

 Brogger, 1 ' Angelina sedgwicki stands so close to Parabolinella limitis, Brogger, 

 that the two cannot belong to different genera. But with this view I am unable 

 to concur. In Parabolinella, including P. limitis, the glabella is short, nearly 

 parallel- sided, and truncate in front, and has deeply impressed glabellar furrows; 

 in Angelina it is longer and narrower, tapers slightly forwards, and is well rounded 

 in front, glabellar furrows are absent and even the neck-furrow is weak. The 

 eye, moreover, lies farther back than in Parabolinella. 



1. Angelina sedgwicki, Salter. Plate XIII, figs. 7 — 12; Plate XIV, fig. 1. 



1859. Angelina Sedgwiclcii, Salter, Murehison's Siluiia, 2ud edition, ]>. 53, Fuss. 9, fig. 2. 



1859. Angelina Bubarmata, Salter, ibid., fig. o. 



1864. Angelina sedgiricJci, Salter, Mem. Geol. Surv., Brit. Organ. Rem., dec. xi, pt. vii, p. 1, pi. vii, 

 figs. 1-5. 



1860. Angelina Sedgwickii, Salter, Mem. Geol. Surv., vol. iii, p. 308, pi. vii, figs. 1 — 5. 



General form ovate, depressed. 



Head semicircular, with the genal angles produced into long spines. 

 Glabella occupying about three-quarters of the total length of the head, sub- 

 parabolic in outline, moderately convex, neck-furrow shallow and ill-defined, 

 glabellar furrows absent or very obscurely indicated by vaguely marked depres- 

 sions. Eyes small, placed near to the glabella and about half-way between the 

 anterior and posterior margins. Facial sutures meeting in front at an obtuse 

 angle in the median line, crossing the margin very obliquely, then running in a 

 gentle curve almost directly backwards to the eye, and from the eye obliquely 



1 Euloiua-Niobe-Fnun-d, Nyt Mag. f. Naturvid., vol. xxxvi, p. 198. 



