128 SAN DIEGO SOCIETY OF NATURAL HISTORY 



WALCOTT (Charles P.)— Continued 



is a larger species tliaii the cenotvpe. ./. aslrr has a frontal boss mvich like the tvpe. 

 Acrocephaliles mul/isegmf/ittis lias 25 thoiacic segments. .1. aoris, a species much like 

 A. tutus ; also A. glomeratus, a species like A. ? majus. 



The author describes seven species under Lorenz's genus Alokistocare, of which A. 

 (ilthra, A . f lahrosun, A. fomona and A. tinda are new. He refers Ptychnpar'ia ? 

 Linnarssoni and P. ? prospecteuse to the genus, and includes a figure and description 

 of the genotype ConocepliUiles suhcornatus Hall and Whitfield, which he compares 

 with the new species A. aliliea. 



The author includes under the genus Lonchocephalus eight species, fi^■e of which are 

 described as new: Lonchocephalus appalachia, L. bunus, L. pholus, L. plena, L. sospifa. 



Describes and illustrates the genotype L. Chippezcaensls Owen. Refers Shumard's 

 Conocephalites minor and C. minutus Bradley to the genus. 



. Dr. Owen, plate 1-A, fig. 15, Geol. Sur. Wis., Iowa and Minnesota, 1852, p. 624, 

 refers to Lonchocephalus ? a pygidium with lateral spines, similar to Dikelocephalus 

 lowensis, which Walcott places as the genotype of Crepicephalus. 



The author remarks that Lonchocephalus is most nearly related to Liostracus An- 

 gelin, with only the cranidiiim for comparison. The difference between them is in the 

 frontal limb and rim, and the absence of well-defined glabella furrows in Liostracus. 



The author uses the Conocephalites calciferous for the genotype of a new genus 

 Saratogia,, placing under it six species, four new: S. arses, S. ariino, S. hera and S. 

 volux, with Crepicephalus jrisconsensis Owen ; including as syn. Dikelocephalus lati- 

 frons, described by Hall, also by Shumard, under this genus. 



In the family Ceratopygidae, genus Crepicephalus Walcott (not Owen), the author 

 includes some 20 species. 



Walcott uses Dikelocephalus ? loivensis Owen, for the genotype. 



Owen's genus, as the name implies, was for a slipper-shaped, tapering glabella, a 

 true Ptychoparia species, which Corda named in 1847. Dr. Owen used the term 

 Dikelocephalus for the mattock-shaped heads, and refers to Dikelocephalus such species 

 as Walcott genotype, although Owen referred to Lonchocephalus, a form like Crepi- 

 cephalus Io^uensis Walcott, on p. 624, pi. 1-A, fig. 15. 



Lonchocephalus might replace in part Anomocare, and Crepicephalus be referred to 

 Lonchocephalus for Owen's Lonchocephalus, p. 624, pi. 1-A, fig. 15. 



Walcott divides the pygidae into two groups: 



1. The Crepicephalus loiuenis group. 



In which the postero-lateral margins of the pygidium extend backward on each side 

 from a broad base into a sharp, narrow spine. Test nearlv smooth. Upper Cambrian. 



2. Crepicephalus Texanus group. 



In which the postero-lateral spines are long, slender, and attached to the side of the 

 pleural lobe above the margin. Test granulated. Lower Cambrian. 



The author describes and figures Crepicephalus ani^usfa, C. camiro, C. comus, C. 

 cossensis, C. coria, C. dis, C. lo-cvensis (Owen) A. Liliana, C. Texan,us (Shumard) var. 

 danace and elongatus, C. thoosa, C. tripuncfatus (Whitfield) also var. magnispinus, C. 

 tumidus, C. unca, C. tinzia, C. upis, and two doubtful species. 



Under the Family Oryctocephalidae, the author includes the new genus \'anuxemella. 

 This genus, represented by J', contracia and I', nortia, from tlie Lower Cambrian, has 

 a simple form, with some features sugcesting A'bertella. It differs in,' absence of 

 glabellar furrows, shorter eye lobes, absence of prolonged third segment of thorax, 

 with only four thoracic segments. The long spines of the tail spring from about the 

 fifth segment, while in Albertella they appear to be the extension of the first or second 

 anterior segment. 



Walcott includes under his genus Karlia the genotype A', minor and Menoccphalus 



