﻿irOMALONOTUS. 



117 



species, being exactly half the breadth. The axis is broad in front, but narrows much 

 behind towards the origin of the tail ; the trilobation being quite obsolete in the body-rings, 

 while in H. Johannis it is distinct. 



The tail is a long triangle, nearly half as long again as the breadth ; and of this the 

 long-conical axis is at first more than half the breadth of the whole tail, and thence tapers 

 less slowly than in II. Johannis, but not so rapidly as in IT. delp/iinocephalus. The axis 

 is, moreover, very flat, even quite to the end, and is well distinguished, but not deeply so, 

 from the side-lobes. It is annulated by eleven furrows, of which the uppermost is much 

 the strongest ; all are angulated in the middle, not straight across as in the Wenlock 

 fossil. The sides are very convex, almost gibbous outwards, and turning down quite 

 vertically ; on their lower third they are again sharply angulated, leaving a broad rough- 

 sculptured area above the final incurvation on the lower surface, a character common to 

 all the Upper Silurian species. The side-furrows are curved, shallow even in the cast, 

 and reach only three fourths to the margin : and, except the upper three, they do not 

 coincide with the axal-furrows, while in //. Johannis at least five of them do so. 



It is unfortunate that w r e do not possess the head ; but I figure one found at Wool- 

 hope, which certainly differs in proportion 



from that of II. delphinocephalus, and was Fig. 28. 



found by the late Hugh Strickland, Esq., 

 at Woolhope. The glabella is very flat, 

 and this coincides with the character of the 

 axis in our species. It is, moreover, very 

 pyramidal, almost triangular, but truncate 

 in front. The eves are somewhat more 

 approximate than in TI. delp/iiuocep/ialus, if 

 I may trust in this respect a careful sketch 

 made some eighteen years back (fig. 28). 

 The cast is punctate all over the glabella, 

 and has larger puncta over the lower portion 

 of the fixed cheeks. 



Locality. — Woolhope Limestone of Woolhope. Plate XI, fig. 12, is in Mr. Edgell's 

 collection. Our fig. 27 is from a fine specimen in the W T oodwardian Museum. 

 Fig. 28 was in the late Mr. Hugh Strickland's cabinet. I do not know where that 

 collection now is, and shall be glad of the information. 



Head of H. cylindricus ? Woolhope Limestone. 

 Collection of the late Mr. H. Strickland. 



Homalonotus Johannis, ii. sp. PL XII, fig. 11 ; and PL XIII, figs. 1 — 7. 



H. modicus elonyatus, 6-pollicaris, scaber, cauda acuta, quam capite triangidato paullo 

 lonyior. Glabella valde distincta, pyramidafa, subcarinala, antice truncata, lobata, — lobis 



