72 Professor T. T. Groom — New TriloUte from Malvern. 



The second specimen (Fig. 4) belongs to an individual somewhat 

 larger than the first. The length and breadth of the thorax are 0*62 

 and 14 millimeter respectively, and those of the pygidium 0"35 

 and 0'85 millimeter. The specimen, moreover, is less convex, 

 perhaps partly owing to pressure, and the axis of the thorax is 

 broader ; in front it occupies nearly one-half of the total breadth 

 of the thorax, and behind about one-third of the breadth at that 

 point. The ridges connecting the axes with the pleurse are, 

 moreover, broader. Apart from these differences in proportion the 

 two specimens agree, but the details of the thorax and pygidium 

 are better shown in the second specimen. The spines of the first 

 three thoracic rings are more perfectly shown, and those, at any 

 rate, of the second and third extend backwards for a considerable 

 distance. The pygidium shows more definite indications of 

 a composition out of two segments in front, and an obscurely 

 segmented or unsegmented portion behind ; the rather narrow 



raised margin of the limbs is very 

 distinct, and is entire. The anterior 

 angles appear to be rounded. Of the 

 head little more than a part of the 

 neck-segment is preserved. 



Fig. 3. 



Fig. 4. 



Fig. 3. — Head, thorax, and pygidium of Acanthnplcurella Grindrodi, gen. etsp. nov., 

 X 37, as made out with the aid of photographs and drawings. The specimen 

 heing partly enrolled, all three parts have been drawn separately. 



Fig. 4. — Thorax, pygidium, and a portion of the head of Acanthopleurella Grindrodi, 

 gen. et sp. nov. x 31. The outlines of this figure were traced from 

 a photograph, with the exception of the portions defined by dotted lines, 

 which have been made from freehand and camera lucida sketches. 



Both specimens were obtained from the grey shales of the 

 Southern Malverns, in which also Cheirurus Frederici, Salter, Agnostus 

 dux, Call., and certain imperfect Asaphids and Olenids have been 

 found. These probably include Platijpeltis Croftii, Call., AsnpheUus 

 affinis, McCoy, Niohe Homfrayi, Salter, Niobe, sp., and Farabolinella ? 

 triarthrus, Call. 



The affinities of this little trilobite are obscure. The diminutive 

 size, the small number of segments, and the apparent absence of 



