CESTRACIONTID^.. 
2P3 
arranged, sharp distallj’, rounder and more nodose proximally ; the 
denticles are very large, placed upon a longitudinal elevation of the 
posterior face. 
42512. Tavo much abraded spines of one individual, free from matrix. 
The posterior face exhibits the median longitudinal eleva- 
tion ; and the exscrted portion of the first measures 0-355 
in length, that of the second 0-255. Purchased. 
P. 3231. Anterior dorsal spine, about 0-425 in total length, exhib- 
iting two alternating series of verj- large posterior den- 
ticles -, with three imperfect cephalic spines. 
Ennislcillen Coll. 
38544. Anterior spine, 0-48 in total length, the denticles towards 
the extremity smaller and more nuraorous than usual. 
Purchased, 1864. 
P. 5869. Crushed and broken spine, with larger denticles, exserted 
portion 0-34 in length. EumsJAllen Coll. 
39853. Much curved crushed and broken spine, the exserted portion 
measuring about 0-275 in length. Purchased, 1866. 
P. 2165. Imperfect anterior spine. Efjerton Coll. 
P. 2166. Crushed spine, about 0-42 in total length. Egerton Coll. 
P. 2802. Spine about 0-35 in total length, with several characteristic 
denticles. Ennislcillen. Coll. 
P. 4279. Large crushed spine. EnnisHllen Coll. 
P. 3164. Large crushed spine, 0-43.5 in total length, with a few 
characteristic denticles. Ennislcillen Coll. 
20006. Posterior dorsal spine, about 0-23 in total length. 
Johnson Coll. 
P. 5866. Imperfect posterior dorsal spine. Egerton Cull. 
P. 5870. Less incomplete posterior dorsal spine, with characteristic 
denticles, the exserted portion measuring about 0-19 in 
length. 
P. 2166 e. Corresponding spine, with very numerous closely arranged 
lateral ribs. Egerton Coll. 
P. 4327. Imperfect much curved posterior spine. EnnisMllen Coll. 
