212 A. S. Woodicard — A Microsatirian from the Coal. 



to the British Museum for determination, and a detailed study of its 

 characters proves it to represent a Microsaurian family that has not 

 previously occurred in the Carboniferous of Europe. 



The fossil was obtained from the roof of the " Bullion Coal " at 

 Trawden, near Colne, and comprises the head, abdominal region, 

 and base of the tail of a small animal, occupying the whole of an 

 elongated split nodule 0-08 m. in length. The jaw cannot have 

 measured less than 0'017 in length, and the distance between the 

 two pairs of limbs must have been about 0"036. There are also 

 indications that the trunk was comparatively robust, and also some- 

 what laterally compressed. 



Of the head, no recognizable portions remain beyond the 

 mandibular rami. The ramus of the left side, imperfect at both 

 extremities, is shown of twice the natural size from the inner aspect 

 in Fig. 1, md., and exhibits some of the conical teeth, which, though 

 robust, have a very large pulp cavity with the walls apparently 

 not folded even at the base. The axial skeleton of the trunk is also 

 unsatisfactorily preserved, the remains of vertehrce merely indicating 

 that they were well ossified and not permitting the determination of 

 their characters. Portions of some of the anterior ribs (Fig. 1, r) 

 prove their stoutness, with an expansion both proximally and 

 distally ; but whether they possessed a distinct head and tubercle 

 cannot be determined. Traces of the posterior abdominal and caudal 

 ribs suggest that these were comparatively slender. 



The interclavicle (Fig. 1, i. cl.) is relatively large, and seems to 

 have been rhomboidal in form, though the margins are not well 



Fig. 1. — Hylnnomus Wildi, sp. nov. : outlines of bones and dermal scutes. — Coal 

 measures, Trawden, near Colne. d. dorsal scutes ; f. femur ; i. cl. interclavicle 

 il. ilium ; md. mandibular ramus ; r. anterior ribs (only partially exposed) ; 

 V, w'. ventral scutes. All the figures of twice the natural size, except v^., which is 

 enlarged four times. 



shown. It must have been at least as long as broad, and the exposed 

 surface is distinctly ornamented with radiating rugse and furrows. 

 Of the pectoral limb there are only obscure indications. In the 

 pelvic arch and limb, however, some of the bones are recognizable, 

 notably the left ilium and femur. The ilium (Fig. 1, il.) is vertically 

 elongated, with a short expansion below, a mesial constriction, and 

 a gradual widening towards the truncated upper extremity. At its 

 base, part of a thin laminar bone probably represents the ischium. 

 The ilium is almost as long as ih.e femur (Fig. 1,/.)) which, though 

 fractured and perhaps in side view, seems to be comparatively 



