ER. Cowper Reed—Girvan Crustacea, ete. 109 
light upon previously described forms, and permits some further details: 
to be added to our knowledge of them. 
ANATIFOPSIS BALCLATCHIENSIS, sp. nov. (Pl. IV, Figs, 1-4.) 
Diagnosis.—Valves oblong, about 13 times as long as high, longer: 
along ventral than dorsal margin, narrower in front than behind, 
transversely gently convex (in a dorso-ventral direction). Dorsal; 
margin nearly straight or gently arched. Anterior end narrowed> 
slightly, obliquely truncated in front, obtusely pointed below. Ventral 
margin decidedly convex, longer than dorsal. Posterior end straight, 
truncated abruptly and nearly at right angles to dorsal edge, with. 
narrow marginal raised rim, and a fairly strong narrow straight groove: 
parallel to margin and at a ‘short distance from it, followed ‘behind by 
a few finer: parallel impressed striz. From the inferior angle of the 
anterior end, a rather strongly impressed straight diagonal line 
traverses the valve, meeting the dorsal edge a little in front of its» 
middle length and thus cutting off a triangular area on the surface. 
Below and behind this impressed line the surface is ornamented with» 
longitudinal raised lines or fine lamelle, parallel to the ventral margin ;» 
these lamelle, on crossing the diagonal line, bend up suddenly to run 
parallel to the anterior end of the valve, and at the same time increase- 
somewhat in strength. A delicate transverse lineation at right angles: 
to the longitudinal lines and between them is visible in well-preserved: 
specimens. 
Dimensions : 
1 II. 
Length .. won 850 ans oa 9:5mm. 
Height (at posterior end) ee OLU Be 908 6:0 mm. 
Horizon and Locality.—Balclatchie Beds, Balclatchie, Girvan. * 
Remarks. —In 1895 Professor Rupert Jones and Dr. Henry 
Woodward’ briefly described and figured an imperfect fossil from, 
Balclatchie, which they doubtfully referred to the lamellibranch genus. 
Cypricardinia, remarking at the same time that in one position it had- 
somewhat the appearance of a broken portion of a Pinnocaris.. 
Mrs. Gray has recently submitted to me this specimen and over; 
a dozen more, some of which are much better preserved than the type. ; 
On further investigation of these fossils and comparison with Barrande’s 
Anatifopsis bohemica* of Etage Dd 3-—d5, I am convinced that they, 
must be referred to this genus, whatever its true position amongst the, 
Crustacea may be. Our specimens bear a very close resemblance to 
the one figured by Barrande in fig. 36, pl. xxvi (op. cit.), and possess all 
the essential characters of the genus. It is interesting to observe that 
Barrande himself stated that Wyville Thomson had discovered a fossil 
similar to Anatifopses in the South of Scotland. 
Nearly all our specimens are of left valves, as Barrande also remarks, 
is the case in A. bohemica. 
The peculiar transverse grooves or grooves at the posterior end of the. 
valve. are interpreted by Barrande as thoracic segments; but if ‘so, 
1. Jones & Woodward: Gzou. Mac., Dec. IV, Vol. II (1895), p. 542, Pl. XV, 
Figs. 4a, 40. [ 
* Barrande: Syst. Silur. Bohéme, vol. i, suppl. (1872), p. 578, pl. xxvi, figs. 36-416. 
