PHOLIDOPHORIDJE. 
453 
Pholidophorus pachysomus, Egerton. 
[Plate XII. fig. 3.] 
1852. Pholidophorus pachysomus , Sir P. Egerton, Figs. & Descript. 
Brit. Organic Remains, dec. vi. (Mem. Geol. Surv.), no. 4, pi. iv. 
Type. Imperfect distorted fish ; British Museum. 
A species (? or variety) differing only from P. hechei in its stouter 
proportions and the relatively larger size of the scales. Maximum 
depth of trunk contained not more than three-and-a-half times in 
the total length of the fish. 
Egerton’s statement that the scales of the lateral line number 
only 30 is founded upon the type specimen, which is proved by 
later specimens to be imperfect. As in P. hechei, the number of 
transverse series of scales in P. pachysomus is approximately 40. 
Form. Sf Loc. Lower Lias : Dorsetshire. 
The following specimens were all obtained from the neighbour¬ 
hood of Lyme Regis:— 
P. 571. Type specimen, much fractured, crushed and distorted. 
Egerton Coll. 
28281. Fish about 0T7 in length and 0*045 in maximum depth, 
with imperfect head, shown in PL XII. fig. 3. 
Purchased , 1853. 
35557. Smaller and more imperfect fish, exhibiting minute fulcra 
on the right pelvic fin. Purchased , 1858. 
39855. Fine specimen 0*105 in length, with remarkably narrow 
caudal pedicle. Purchased , 1866. 
P. 1049 a, b, P.1052. Three imperfect crushed and fractured spe¬ 
cimens. Egerton Coll. 
38475. Distorted fish. Purchased , 1862. 
P. 1049 c, d. Two specimens showing remains of the head and 
abdominal region. Egerton Coll. 
38740. Small imperfect fish 0*1 in length, probably referable to this 
species. Purchased , 1865. 
A fish not yet clearly distinguished from P. pachysomus also 
occurs in the Upper Lias of Wiirtemberg, and has already been 
noticed by Quenstedt (Handb. Petrefakt. 1852, p. 207, pi. xvii. 
fig. 15, and Der Jura, 1858, p. 234). The following are examples 
of this form : — 
