254 F. R. CoH'per Reed — On the Genus Conocoryphe. 



after a careful examination of it I have much doubt ^ if ej^es really 

 existed, though the species has been described as possessing them. 

 The number of thoracic segments and the shape of the pleurae are 

 the same as in Conocoryphe, sens, str., and the genal angles similarly 

 bear spines. The pygidium, according to Hicks, has fewer segments 

 than in C. Siilzeri, but the state of preservation of this member is 

 very poor. With much probability this species may therefore rightly 

 be left in the genus Conocoryphe. 



C. humerosa, Salter (Rep. Brit. Assoc, 1865, p. 285 ; Q.J.G.S., 

 vol. XXV, 1868, p. 54, pi. ii, fig. 7). — The specimen on which this 

 species was founded has the head-shield very much crushed, and the 

 ■characters given by Salter (op. cit.) are very imperfectly seen, so 

 that not much weight can be attached to them. The ornamentation 

 of the crust is, however, distinct, and the neck-spine is preserved 

 fairly well. The portion of the thorax is nearly perfect, and all the 

 features mentioned by Salter can be made out, as well as some others 

 not recorded. But all the characters are absolutely different to any 

 found in the thorax of any species of Conocoryphe, sens, str., and it 

 can be positively asserted that it does not belong to this genus. 

 The spine on the neck-segment, followed by those on the axial rings 

 of the thorax, the shape, the groove, and free spinose ends of the 

 pleura suggest the genus Olenoides. The peculiar radiate " venulose 

 lines " and granulation ornamenting the surface of 0. typicalis 

 (Walcott) described by Walcott ^ are distinctly visible on the head- 

 shield of the type-specimen of C. humerosa ; and comparison with 

 specimens of Olenoides from America shows that the spines on the 

 axis closely resemble those in 0. typicalis, while the pleuree are 

 more like those of 0. nevadensis (Meek). The geological age of the 

 beds in which Olenoides occurs is approximately the same as that in 

 which C. humerosa was found, and there seems to be no reason for 

 hesitating to ascribe this species to the genus Olenoides. 



C. invita, Salter (Dec. Geol. Surv., 1865, pi. vii, fig. 6).— This 

 species has been referred by Brogger ^ to his new genus ApatoJcephalus, 

 as I have recently mentioned.'* The characteristic features of this 

 genus, which shows many points of resemblance to Euloma and 

 Bicellocephalus, are well exhibited in the head-shields of this form, 

 and Brogger's view needs no further comment. 



C.l longispina. Belt (Geol. Mag., Vol. V, 1868, p. 9, PI. II, 

 Figs. 12-14). — By the characters of the head-shield we can at once 

 decide that this species does not belong to Conocoryphe. Judging 

 from Belt's figures and description, it may without hesitation be 

 referred to the genus Olenus, and probably to its subgenus 

 ParahoJinella, as indicated by the course of the facial suture and 

 position of the eyes, but the shortness of the glabella is remarkable. 



a Lyelli, Hicks (Q.J.G.S., vol. xxvii, 1871, p. 339, pi. xvi, 

 figs. 1-7).— On a former occasion^ I have stated that this species is 



' Geol. Mag., Dec. IV, Vol. V (1898), p. 495. 



2 Bull. U.S. Geol. Surv., No. 30 (1886), p. 180, pi. xxv, fio;s. 2, 2a, 7. 



3 Nyt Maijazin fur Naturvidenskabeme, Bd. xxxv (1896), pp. 179-185, 200. 



4 Geol. Mag., Dec. IV, Vol. VII (1900), p. 46. 

 * Geol. Mag., Dec. IV, Vol. V (1898), p. 495. 



