HOMOLOPSIS. 23 



Species luiica. Homolopsis Edwardsii, miJii. Plate V, figs. 1,2. 



Descr. Carapace rather longer than it is broad, everywhere granulated ; the regions 

 and their lobes very distinct and strongly tuberculated ; the gastric region broad, the 

 anterior portion, comprehending the epi-, proto-, and raeso-gastric lobes, forming on each 

 side a nearly circular area, furnished vi^ith five tubercles, and separated from the raeta- 

 gastric by a well-marked furrow ; the metagastric lobe has three tubercles disposed in an 

 equilateral triangle ; its anterior process extends to just behind the front ; the hepatic 

 region is very small on the upper surface, and has a single tubercle ; the lateral portion 

 extends broadly downwards to the pterygostomian process, where it has a strong, obtuse 

 carina; the urogastric is linear, and has a few small, inconspicuous tubercles; the 

 epibranchial lobe is very convex, and has a large, strong, and prominent tubercle standing 

 outwards on the latero-anterior margin of the carapace ; the mesobranchial has a single 

 tubercle ; the metabranchial lobes very large, roughly granulated, without tubercles, of a 

 somewhat triangular figure, the lateral boundary extending forwards to half the length of 

 the carapace; a very distinct sulcus separates each metabranchial from the anterior 

 branchial lobes and from the gastric region, the two meeting in an angle at a short distance 

 from the posterior margin. The gastric region regularly pentagonal, with a single 

 tubercle. The nuchal furrow distinct and deep. The front is small, with a small tubercle 

 on each side, and its apex incurved to meet the epistome. The orbits nearly round, open 

 beneath, with a triangular fissure above near the external angle, exterior to which is a 

 large, strong spine ; the antennary fossae small, oval ; epistome large, irregularly penta- 

 gonal, with a strong, transverse carina. The broadest part of the carapace is at the 

 anterior and lateral angle of the metabranchial lobes. 



Length of the carapace, O'lO inch; breadth, 0"9 inch. 



From the Gault at Folkestone and the Greensand at Cambridge. 



Ohs. The affinity of this species to Homola was first noticed by Mr. Carter, of Cam- 

 bridge, who had applied to it in his own cabinet the generic name which I have adopted- 

 It bears a strong general resemblance to the genus DromiUtes, described in the former 

 part of this monograph ; but its relation to the Dromiada; is more apparent than real. 

 Whether it may be considered as in any way osculant between these two families, or 

 as, in some degree, confirmatory of an opinion which I have long entertained, that the 

 distinction between the Dromiadae and Homolada; is not borne out by the natural relations 

 of the genera composing the two groups, I must leave with this mere suggestion. 



The remarkable breadth of the metabranchial lobes is the character which gives it the 

 greatest prima facie likeness to Dromiliies ; but its essential characters, and in particular 

 the absence of all puncta for the insertion of hairs on the carapace, obviously remove it 

 from that genus. 



