Palceozoic Fussils. 389 



front suture in a wide trian^fle from an almost straight junction 

 with the upper part of the head-shiekl. 



Remarks. — This form is in tj^pical specimens sharply sepa- 

 rated from H. herscheli, ; all the forms waicli I can recognise in 

 the Albany Museum consist of heads only, but some small speci- 

 mens of the body segments bearing spines, which I have called 

 H. lex may belong to this species. No. 63 of the Museum Cata- 

 logue is probably a variety ; the front margin is broadm- than in 

 the usual form and curves upwards to the apiculus ; the front 

 suture cuts across the base of the little triangular plate supporting 

 the apiculus on the upper surface. 



Type specimen. Width, 4 cm. Length from neck ring to 

 base of rostral plate, 2.0 cm. 



Glabella. Length, 1.7 cm. Width of base, 1.7 cm. Width 

 of fore part, 1.2 cm. 



Cat. Nos. &%, 03, 64 (Type). Donor : Mr. A. G. Bain ; no 

 localit5\ 



Cat. No. 1613. Donor : Mr. P. Nightingale. Locality, Clan- 

 will iam district. 



Homa/onotiis fc.r, nov. sp. 

 PI. IX.. Figs. 4a, 4b. 



This species is founded on body segments only ; a small 

 pygidium on the same block with a typical half-coiled up body 

 may belong to the same form. 



The rings show no particular features differing from che 

 usual H. liersclieli type, except in the ends, which in H. Iirrsdicli 

 are rounded in the lower margin, in this species are pointed, and 

 probably bore spines. On the back the segments bear spines, one 

 on either side of the fulcra, with sometimes small additional ones. 

 In the small specimen. No. 13 of the Museum Catalogue, the sur- 

 face of the segments is smooth except for a i-ow of very large 

 spines on the inside of the fulcra. The pygidium is of the type 

 figured by Salter, PI. XXIV., figs. 7a and 71)., that is to say the 

 ribs are continuous right ovei" tlie sui-face of the pygidium, with 

 merel}' an inclination at the junction of the side with the axis. 



