BIBLIOGRAPHY OF PALAOZOIC CRUSTACEA 51 
LAKE (Philip)—Continued 
Microdiscus lobatus Hall, M. speciosus Ford, M. punctatus Salter, refers M. scanicus 
Linors., M. eucentrus Linnrs. to this species. Microdiscus Sculptus Hicks. Shumardia 
pusilla Sars (refers Conophrys salopiensis Callaway to this species). Shumardia miquelt 
Pompecki, 8. bottnica Wiman. (Acanthopleurella Grindroni Groom, to this species.) 
Shumardia pusilla var. morvensis n. var. Shumardia sp. Orometopus elatifrons Ang. 
Refers this genus to the family ‘Trinucleidae as a primitive form. Orometopus prae- 
nuntius Salter (Ampyx Salter, Mem. Geol. Sur., vol. 3, p. 321, pl. 8, fig. 5). 
A Monograph of the British Trilobites. 
Part III, Paleont. Soc. London, 1908, pp. 49-64, plates V-VI. 
Olenus truncatus Brunnich, O. gibbosus Wahl., OQ. micrurus Salt., O. cataractes 
Salt., O. mundus n. sp., O. longispinus Belt. Parabolina Spinulosa Wahl. Parabolinella 
Williamsoni Belt. 
A Monograph of the British Cambrian Trilobites. 
Part 4, pp. 65-88, plates vii-x, Paleontographical Society, 1912. 
The author describes and illustrates Parabolinella caesa nov.; compares it with P. 
williamsoni, to which it is closely allied. 
Parabolinella rugosa Brogger var., P. triarthra Callaway, described by that author 
under the genus Olenus in 1877. : 
Triarthrus shinetonensis Raw. The species named by Raw, Rep. Brit. Assoc. for 
1907, p. 512, without a description or figure. 
The author compares it with 7. spinosus Billings. 
Dr. Ami, Trans. Ottawa Field Nat., vol. 1, No. 4, 1882-83, indicates that Triarthrus 
spinosus Billings, had spines on the 8th to 13th segment of the thorax. The English 
species has 14 segments in the thorax, with the 12th axis ring spined. 
Genus Spherephthalmus Angelin. 
The author remarks that the genera Leptoplastus, Spherophthalmus, Ctenopyge and 
Euryeare, form a natural group of the Olenidae, characterized by the fact, that the 
cheek spines do not spring from the posterior angles of the head, but from the middle 
of the external margin or even from the lateral angles. 
Brogger considers that all these forms should be placed in a single genus, which he 
calls Leptoplastus, divided into four subgenera. 
The author describes Sphaerophthalmus alatus Boeck. This species is the same as 
Olenus humilis Phillips, 1848, according to Linnarsson’s investigations of original 
specimen. 
Sphaerophthalmus major nov. 
Ctenopyge: The author does not agree with Brogger and Moberg that only the axial 
rings are fused, while the pleurae are free. The pleurae seem to be closely connected 
and rarely show any signs of separation. 
The author describes Ctenopyge fusiformis noy., C. bisulcatus Phillips. Salter, 
taking Angelin’s Sph. alatus figure as his guide, indicating it with Olenus bisulcatus 
Phillips; therefore this species in English publications means Ctenopyge bisulcata or 
some similar form. Ctenopyge falcifera nov., C. pecten Salter, C. expansa Salter, C. 
teretifrons Angelin, described under the generic name of Sphaerophthalmus. 
Lambert (A. E.) Description of Dalmanites lunatus. 
Bull. Geol. Soc. America, vol. 15, p. 480, plate 44, 1904. 
Lapparent (A.) De Note sur un gisement de Trilobites decouvert 
par M. Maurice Gourdon aux environs de Luchen. 
Bull. Geol. Soc. France, 3rd ser., vol. 8, 1879-1880, pp. 47-48. 
