384 



Alhamj Museum Records. 



in the following particulars. 

 Salter's Specimens. 



Glabella urceolate, broadest 

 below, contracted above, and 

 blunt ;)n front margin. 



Glal)ellar furrows : first pair 

 directed forwards, basal and 

 middle ones backwards ; neck- 

 furrow straight ; facial sutures 

 do not reach front margin. 



Rostral plate narrow in front, 

 occupj'ing about one half of the 

 front margin. 



Oval flattened spaces at the 

 base of the glabella, and below 

 the ej^es, are confined by the 

 swelling of the glabella. 



Thirteen body rings. 



In the pygidium, ribs contin- 

 uous over the axis and sides (see 

 H. lex). 



Albany Museum Specimens. 



Glabella with straight sides, 

 slightly bi'oader at base. 



Glabellar furrows all directed 

 backwards (Lake defines the 

 species thus, but refigures Sal- 

 ter's type M : neck furrow with 

 strong prominence in the mid- 

 dle indenting the glabella ; 

 facial sutures reach the front 

 margin. 



Rostral plate broad in front, 

 occupying the whole of the 

 front margin. 



Oval spaces deeply indent the 

 swollen base of the glabella. 



Fourteen body rings. 

 Ribs interrupted at the junc- 

 tion of the axis with the sides. 



In the last feature Salter figures both forms, but I take it that 

 his large perfect pygidium, PI. XXIV., fig. 7, is the one which 

 he wished to make his type for it is the one he describes, while 

 fig. 4 is merely drawn to show the arrangement of the body and 

 tail. 



We have then as typical H. liersclieli :— 



Salter's figs, la, lb, 2, 3 and 4, pi. XXIV. ; Lake's figs. 2a, 2b, 

 3a, 3b, pi. XXVI. 



As probably a new species. Lake's fig. 1., i»l. XXVI. 



As H. lex probably Salter's figs. 7a, 7b, pi. XXIV. 



Ab H. perarmatus^ Freeh (=? H. horridus, mihi), Salter's 

 fig. 5, pi. XXIV. 



Salter himself states that in his material there are at most two 

 species ; it is a great pity that these specimens that were lying in 

 the Albany Museum at tne time were not sent with the others ; 

 we should then have known definitely what the species H. her- 



'Ann S'.A. Mus., Vol. IV., p. 215. 



