44 PROCEEDINGS OF THE ACADEMY OF 



Bbllinuros Dan^i, M. & W. V 



Cephalo-thoracic shield transversely crescentric, more than twice as wide 

 as long, moderately convex, the height nearly equalling half its length ; ante- 

 rior and antero-lateral margins broadly and regularly rounded ; lateral angles 

 produced obliquely backwards and outwards, with a very slight inward curve, 

 into slender mucronate spines, terminating remote from, and nearly opposite 

 the middle of the abdomen ; posterior margin on each side for about two- 

 thirds of the way in from the lateral angles, toward the middle, concave in 

 outline ; nearly straight or very slightly concave along the middle between 

 these two points. Mesial lobe small, somewhat lower than the ocular ridge 

 on either side, but rounded and well defined behind, where it supports a small 

 central tubercle (or short spine?), thence narrowing forward, and sometimes 

 showing a slight tendency to develope a second much smaller tubercle, at 

 about one-third the length of the shield from its posterior margin ; near 

 which point it suddenly contracts into a mere linear carina that extends 

 forward to the anterior transverse division of the ocular ridge. Area cir- 

 cumscribed by the ocular ridge, crown-shaped, or subquadrangular in out- 

 line, and composing the central third of the cephalo-thoracic shield ; a little 

 wider anteriorly than its length, which equals about five-sixths that of the 

 shield ; lateral margins concave in outline ; anterior side convex, with a 

 central emargination ; internal surface divided into four irregular subordi- 

 nate areas, by the mesial lobe with its linear anterior continuation, and a 

 less distinctly defined, secondary transverse linear ridge. Ocular ridge 

 narrow, but distinct, its lateral divisions arching inwards behind the eyes, 

 and terminating posteriorly at the margin of the shield nearly opposite the 

 middle of each lateral lobe of the abdomen, in a (triangular ?) spine, which is 

 directed backwards, outwards and a little upwards ; anterior transverse di- 

 vision arching forwards on each side, and curving backwards in the middle. 

 Compound ? eyes small, remote, and located one at each antero-lateral angle 

 of the crown-shaped central area, at points about one-third the length of the 

 shield from its anterior margin. (Simple eyes, if they existed, unknown.) 



Abdomen transversely suboval, or truncato-subcircular in outline, being 

 wider than long, and nearly straight anteriorly, with lateral margins rounding 

 in abruptly in front, and more gradually into the regularly rounded posterior 

 outline ; generally rather more depressed than the cephalo-thorax, particularly 

 in'front. Flattened lateral border rather narrow, and regularly scolloped be- 

 tw'een its projecting marginal spines. Mesial lobe narrow, or of about the 

 same breadth as that of the cephalo-thorax, and near half as broad as, aud a 

 little more elevated than, the lateral lobes ; segments well defined ; first and 

 third each provided with a small central tubercle ; sixth as long as any three 

 of the others, rather abruptly narrowed and depressed behind, and surmounted 

 anteriorly by a large tubercle (or spine ?). Lateral lobes somewhat flattened 

 on the inner half, and rounding down rather abruptly to the flattened free 

 borders on each side and behind ; segments defined by distinct linear ridges, 

 which are separated by flattened spaces four or five times as wide; these 

 ridges extend obliquely outwards and a little backwards across the lateral 

 lobes and their flattened borders, beyond which they are produced into slender 

 mucronate spines, of nearly equal length, curved obliquely backwards. 



Caudal segment, or stylet, apparently nearly two-thirds as long as the ab- 

 domen ; gradually tapering, and trigonal or sub-trigonal, being flat below, 

 angular on each side, and angular or rounded above. 



Appendages of the under side unknown, excepting one of the legs, which 

 is seen in one specimen, projecting out from under the cephalo-thoracic 

 shield, between its posterior margin and the abdomen. It is long and slender, 

 and shows of the first segment projecting from under the shield, a length of 

 about 0-12 inch. The next segment appears to be 0-25 inch in length, 

 with a breadth of only 004 inch. The succeeding segment can be traced in 



[Mar. 



