430 ME. F. E. COWPER EEED ON THE [Aug. 1 896, 



nearly half the length of the anterior side-lobes. The basal lobes 

 are distinct, and form right-angled triangles with an inner angle of 

 rather over 30°. Measured along the axal furrow their length is 

 quite three-fourths that of the preceding side-lobe. 



The neck-segment is rounded and convex, somewhat raised 

 behind, and broadest in its middle portion behind the horizontal 

 part of the neck-furrow ; on each side of this it decreases gradually 

 in width to the axal furrows. 



The fixed cheeks are only partially preserved. Their anterior 

 pointed end reaches forward only so tar as the middle of the 

 glabella. The palpebral lobe, or rather band, runs as a narrow 

 rounded border along the outer edge of the fixed cheek, but it is 

 badly shown in our specimens ; it extends forward around the 

 front end of the anterior side-lobe of the glabella, to pass into the 

 true anterior margin at the point of union of the axal, marginal, 

 and first side -furrows. The palpebral band is marked off by a 

 shallow furrow — the eye-furrow — from the rest of the fixed cheek, 

 just as in L. angustus, Beyr., and L. Eichwaldi. Nieszk. 



The whole surface of the middle shield is thickly studded with 

 tubercles of various sizes. 



Measurements. .„. 



Length of glabella , 12*5 



Breadth of glabella at middle side-furrows 11*0 



,, ,, base (between posterior ends of 



axal furi'ows) 14 - 



Breadth of front of frontal lobe 10*0 



There is a fine specimen from Kildare in the Woodwardian 

 Museum ; and in the Museum of Practical Geology, Jermyn Street, 

 are two specimens of head-shields from the same locality and lime- 

 stone. With one of these head-shields is mounted on the same 

 tablet a very peculiar pygidium of a IAchas unlike any found at 

 Keisley, with a long axis with four rings and a terminal piece 

 nearly -J- the width of the pygidium and fully f its length ; the 

 three pairs of pleurae are short and broad, with long free points. 

 This tablet has a label with the name Liclias bulbiceps, Phill. MS., 

 and it was catalogued in 1865 with this specific name. Another 

 tablet with a similar head-shield, but the utterly different pygidium, 

 which I have called L. bifurcatus, is also labelled L. bulbiceps, MS., 

 and bears the note, ' identical with Gaspe's species, Logan.' This 

 also is entered in the 1865 catalogue as L. bulbiceps. Mr. E. T. 

 Newton thinks that the specific name was given by Salter, but no 

 description or further reference to the fossil can be found. Prom 

 the name itself the species was no doubt founded on a head-shield, 

 and so I think it is as well to retain this name for the head-shield 

 which I have described above. But since there is a doubt whether 

 either of the pygidia mounted with the head-shields in the Jermyn 

 Street Museum really belongs to the same species, I prefer to call 

 the one there on tablet 7, flat case 5 (p. 39 of Cat. Camb. Sil. 

 Possils, 1878), by a new name — L. bifurcatus (q. v.). 



