PLATE XVII. 



FIG. 1. Orthis lenticular is Ventral valve; b Dorsal valve; c Mould of interior 

 of ventral (Legend, a 1 Adductor muscle, b l Diductor muscle, d 1 Cardinal area, 

 o 1 Ovarian space); d Mould of interior of dorsal (Legend 6 1 Diductors, 

 d 1 Cardinal area, o 1 Ovarian space). All mag. f. From Band C 3c, Navy 

 island, St. John. See p. 213. 



FIG. 2. Orthis lenticularis var. lyncioides. a. Young ventral valve ; 1> Full grown 

 ventral ; --c Small dorsal valve. All Mag. From Band C 3e, Navy 

 island, St. John. See p. 217. 



FIG. 3. Orthis lenticularis var. atrypoidcs a Ventral valve ; I Dorsal valve. Both 

 Mag f . From Band C Be, Navy island, St. John. See p. 216. 



FIG. 4. Orthis lenticularis var. strophomenoidcs a Ventral valve ; b Dorsal valve. 

 Both Mag. f. From Band C 3a, Germain St., St. John. See p. 217. 



FIG. 5. Ctenopyge pccten a Middle piece of the head shield ; b Pygidium (After Lin- 

 narsson). Both Mag. f. The head from Band C 3c, at Escasonie shore, 

 East bay, N. S. See p. 229. 



FIG. G. Parabolina Dawsoni a Middle piece of head shield; b Movable check; c 

 A front joint of the thorax ; d A pleura from the middle of the thorax ; e The 

 hypostome ; / The pygidium. All mag. f . From Band C 36. Escasonie 

 shore East bay, N.S. See p. 223. 



FIG. 7. Sphcerophthalmus Flctcheri a Middle piece of head shield ; 6 Same from the 

 front ; c Same from the sida ; d Movable check ; e Hypostome ; / 

 Pygidium. All mag. $ except e and / which are f . From Band C. 36, Escas- 

 onie shore, East bay, N. S. See p. 227. 



FIG. 8. Agnostus triscctus Salt. mut. ponepunctus a Head shield ; 6 Joint of the 

 thorax ; c Pygidium. All mag. J. From Band C. 36. Escasonie shore, 

 East bay, N. S. See p. 220. 



