PLATE I. 
Fig. Page 
1. CJiondrosteus acipenseroides , Egerton; lateral aspect, one- 
quarter nat. size.—Lower Lias; Lyme Begis. cl. Clavicle. 
Tim. Hyomandibular. ju. Jugal, op. Operculum, pt. 
Pterygoid, s.cl. Supraclavicle. s.op. Suboperculum. 
[P. 3366.] 28 
2. Ditto; head and pectoral arch, inferior aspect, one-half 
nat. size.—Ibid. hr. Branchiostegal rays. ch. Cerato- 
hyal. d. Dentary. i.cl. Infraclavicle, mx. Maxilla. 
so. Suborbital, x. Fracture across clavicle. Other 
letters as above. [P. 2048.] 31 
3. Ditto ; left Pterygoid ( pt .), Palatine ( pi .), Maxillary (mx.), 
and Jugal (ju.) bones, outer aspect.—Ibid. [P. 3367.] 29 
4. Ditto; neural arches of trunk, right lateral aspect.—Ibid. 
n.a. Neural arch. n.s. Neural spine. [P. 2050.] 29 
5. Ditto; portion of pectoral arch, visceral aspect.—Ibid. 
cl. Clavicle i.cl. Infraclavicle. r P. 4341 b." : 32 
