﻿LINGULOCARIS. 



83 



whose labours in elucidating these old Phyllopodous forms are well known. 

 It was found by Dr. R. Roberts in the Tu-hwnt-i'r-bwlch quarry at Portmadoc, with 



Asaphus. 



Another of the old associates of Hymenocaris in the Tremadoc series is the 

 "second specimen" mentioned at p. 220 of our First Report (1883). Though 

 smaller than the foregoing (2f Xyf inches, 70 by 21 mm.), it is of a somewhat 

 similar shape, having been acute at both ends (probably, though one is broken), 

 elliptically curved below and nearly straight above, thus having the outline of a 

 sharp-ended boat (fig. 7 in our Sixth Report (for 1888), p. 179). It is not really 

 " emarginate " at one end, as stated at p. 220 of the First Report, that appearance 

 being due to a slight transverse crack and some inequality of the surface near 

 the end, which was probably acute, but has been squeezed out of shape and 

 frayed away by the longitudinal plaiting of the hard, compressed, slaty shale or 

 mudstone. The cross-pressure has also coarsely plaited the valve throughout, and 

 somewhat lengthened it. 



From the upper part of the Lower Lingula-flags at Cae'n-y-coed, near 

 Maentwrog. Coll. Mr. D. Homfray. Woodwardian Museum, Cambridge (i4o)- 



A somewhat similar but badly preserved fossil, from the Brathay Flags of 

 Long Sleddale (Marr Coll. in the Cambridge Museum), is probably a Lingulocaris of 

 the same or a closely allied species (' Catal. Type Foss. Camb. Mus.,' 1891, p. 136). 



4. Lingulocaris, sp. Plate XIV, figs. 5 a, 5 b. 



'Eeport. Brit. Assoc' for 1889 (1890), p. 65. 



An interesting specimen in M. Lebesconte's collection (at Angers) from the 

 • Schiste ardoisier inferieur (Faune 2 de ) ' of Angers (Maine et Loire), very closely 

 resembles Lingulocaris Salteriana, J. and W., shown by fig. 6, at p. 179 of our 

 Sixth Report (for 1888), and in PI. XIV, figs. 1 and 2. Unfortunately it is badly 

 preserved and not quite perfect. 



It was probably about 80 mm. long when perfect ; it is 21 mm. broad (high) 

 where widest, at a third of its length from one end, which, if it be the anterior, is 

 more acute than in L. siliquiformis. The dorsal line was gently convex, and the 

 ventral was much fuller, with a somewhat angular convexity. Fig. 5 b shows the 

 sectional area at the widest part ; its contours may have been modified by pressure. 

 Much of the surface of the cast is thickly dotted over with possible indications of 

 spinules or small tubercles. 



