270 ROYAL SOCIETY OF CANADA 
EXPLANATION OF PLATES. 
PrATE, IL 
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Fig. 1.—Lingulella Selwyni, n. sp. Mag. 7. a. Ventral valve, interior showing 
lateral muscle-scars, scars of anterior adductors, vascular trunks, etc. 
b. Dorsal valve, showing cardinal and lateral muscle-scars, central group 
of four scars, vascular trunks, etc. Both from MecFee’s Point. See 
page 255. 
Fig 2.—Lingulella Roberti, n. sp. Mag. ? a. Ventral valve, showing deltidial 
area, vascular ridges, anterior adductor muscle-scars, vascular trunks, 
etc. 6. Dorsal valve, showing cardinal muscle-scar, vascular ridges, 
median septum, central group of muscle-scars. Both from McFee’s 
Point. See page 256. 
Fig. 3.—Lingula Howleyi, n. sp. Nat. Size. a. Ventral valve, abraded example, 
showing the diverging ridges and print of the rhomb at different stages 
of growth. 6. Dorsal valve, abraded example, showing pits of lateral 
muscles, etc. The large lozenge at the back of this figure shows the area 
over which the adductor muscles have moved during the growth of the 
shell, and the lanceolate area in front of the lozenge outlines, the front 
of the visceral cavity. From Kelly’s Island, Conception Bay, Newfound- 
land. See page 259. 
Fig. 4.—Lingulobolus affinis, Bill, sp. Mag. 14. a. Ventral valve mould of. 
b. Dorsal valve, mould of. See page 261. 
The following features are noted (notation that of Messrs. Davidson and King 
for the Trimerellidæ) : 
a. deltidium p. post-median scars v. central scars 
g. lozenge q. crown | w. sub-cardinal scars 
1. median plate r. side f crescent a. umbo-lateral scars 
m. median scars Sends) y. parietal scars 
n. anterior scars {. transverse scars v.f. vascular trunks 
o. lateral scars u. archlet 
c. Variety cuneata, n. var. Mag. ?. Notation as above. d. Side view of 
same, showing crescent, scars of muscles and parietal band. AI] from 
Great Bell Island, Conception Bay, Newfoundland. See page 262. 
Fig. 5.—Spherobolus spissus, Bill., sp. Mag. ?. a. Ventral valve, mould of; 
Notation as in preceding species. 06. Dorsal valve, e cardinal callosities, 
notation otherwise as above. c. Section of the two valves to show the 
convexity. All from Great Bell Island. See page 263. 
PLATE II. (PART) 
Fig. 1—Clitambonites (Gonambonites) plana, Pander, var. Mag. 7. a. Ventral 
valve, mould of, showing deltidium, shield-like scar at the umbo, strap- 
like radiating grooves, and crenulated margin. 0. Dorsal valve, mould 
of, showing low hinge area, wide deltidium, cardinal process, cruræ, 
crural plates, dorsal furrow, and vascular furrows. c. Section of the two 
valves, in profile. All from McFee’s Point, Cape Breton. See page 266. 
