198 ROYAL SOCIETY OF CANADA 



Sculpture. — Billings makes no reference to the surface marks which 

 are similar to those of the preceding species, but less prominent and not 

 running into tuberculations on the posterior half of the glabella ; the 

 flattening of the ridgelets on the surface of the test in the small examples 

 gives their surface a more glossy aspect than is found on the larger 

 example from Long Beach. 



Billings says the posterior glabellar furrows are barely perceptible ; 

 in the small specimens from the limestone they are distinct, but not deep^ 

 and the place of the two next furrows is clearly indicated by a variation 

 of the surface markings. The large specimen shows very distinct 

 anastomosing raised lines on the glabella. 



Billings does not mention the small spine in which the occipital ring 

 ends, this being deficient in the sandstone cast. 



The description of the characters of the glabella in Olenoides Bllsi, 

 as given b}' Walcott, strikingly conform to those of this species, but the 

 ocular fillet is represented as further from the marginal furrow than I 

 find to be the case in D. parvula. The pygidium given as that of Ellst 

 also differs from the one I find with D. parvula, and has the typical 

 number of spines of a Dorypyge. The variation in the furrows of large 

 and small heads in the last-named species also follows the rule found by 

 Walcott in heads of B. Ellsi? 



Three examples of a pygidium are associated on the tablet with the 

 heads of D. parvula, but as Billings does not mention the pygidium, it 

 would appear that they were not before him when he wrote his descrip- 

 tion of the species. Nevertheless, as they are interesting forms of the 

 Dorypyge type they are figured here. Though not having the typical 

 number of spines of a Dorypyge pygidium they have its general aspect. 

 The normal number of spines is twelve, but, as remarked in a previous 

 part of this article, one occurs with six spines, and. this one has only two. 



ANOMOCAEE, Angelin. 

 Anomocare Tucer, Billings sp. (PI. IV., tig. 8.) 



Conocephalites Tucer, Bill., Geol. Vermont, vol. ii., p. 951, fig. 356. 

 Conocepltalites Tucer, Bill., Pala^oz. Foss , vol. i., p. 13, fig. 16. 

 Ptychoparia Tucer, Walcott, U. S. Geol. Surv., Bull. 30, p. 197, pi. xxvi.. 

 fig. 3. 



Ptychoparia Tucer, Wale, Fauna of Olenellus Zone, p. 652, pi. xcvi., fig. 3. 



The sides of the middle piece of the head-shield figured by Billings 

 are crushed in, hence the form is not as he represents it ; the position of 

 the eyelobe is given, allowing for the distortion. As restored from the 

 two examples preserved, I suppose this species to be an Anomocare, 

 though the furrows and form of the glabella are moi'e like Ptychoparia. 



1 Olenellus Fauna, page 642, last paragraph. 



2 U. S. Geol. Surv., Bull. 30, p. 201, pi. xxvi., figs. 2 and 2 a. 



