CRUSTACEA PROM KUTCH AND SIND. 



15 



to resemble more those seen in Xantholites and Xanthopsia than in Carpilius 

 and allied genera. With Galena, and the fossil Galenopsis, there appear to be also 

 some marked affinities, as, for instance, the tumidity of the anterior part of the 

 pleural region, giving a considerable thickness to the front part of the carapace, 

 the comparatively small rounded orbits, with a hiatus at the inner angle, and 

 the very small size of the basilar joint of the antennae. Among other fossil genera, 

 Typilobm appears to possess also a great resemblance to Bell's Flagiolophus*w\Ac\\ 

 Milne-Edwards classes with Galena in one group. The outer maxillipeds of 

 Flagiolophus are not well known, but they also in some respects appear to resemble 

 those of the present genus. 



By much the prevailing characters of Typilohus seem, however, to show decided 

 affinities to the Leucosidm, a family of the microcephalic Urachyura, formerly 

 generally called Oxystomata. In that family the carapace is more or less rounded, 

 slightly wider than long, the front edge is short, slightly projecting, orbits close 

 together, and their inner hiatus filled in by the antennulary basal joint, while the 

 antennae are very small. They are almost the only family in which the first joints 

 of the outer-maxillipeds are very long, and the last joints externally not, or barely, 

 visible ; they also have the second endopodite of about equal width with the cor- 

 responding exopodite. Eor a comparison, nay, almost identity, in the form of these 

 joints of Typilohus, I may particularly refer to the recent genus Ebalia, as figured 

 in Cuvier's Regno animale, pi. 24. 



The only peculiarity to be observed in Typilobm, distinct from other Leucosiv^, 

 is the form of the tail in the female, being of equal width throughout, while in 

 Ebalia, Ixa, and allied genera the median joints are sub-circularly enlarged. 



There appear to be as yet very few fossil Leucosid^ known. Al. Milne- 

 Edwards suggestsf that Bell's MythraciaX (baud MithraxJ probably belongs to 

 the present family. 



TyPILOBTJS GEANUIOSUS, Stol., PI. Ill, Eigs. 3—5. 



Carapace transversally ovate, its length being in proportion to width very 

 nearly as 8 : 10 ; the anterior larger half nearly semicircular, the posterior smaller, 

 gradually narrowed and truncate at the posterior edge, with a small tubercle at each 

 end; upper surface rather coarsely, equally, and very densely granular, or when 

 the surface is not well preserved, provided with numerous shallow pits_ of equal 

 size; the sub-hepatic and pleural regions are simUarly marked, sub-branchial region 

 only finely rugose. ' Division of lobes typical for the genus; the lateral groovfes 

 defining the gastric region are anteriorly rather indistinct, posteriorly, where they 

 contract, mucE deeper; groove between the hepatic and branchial -gion slight ; 

 cardiac lobe very convex, transversally sub-ovate, somewhat wider than the has 

 of the gastric, and separated by a flattened area from the posterior --S^" ^^ ^he 

 carapace. Branchial region mostly elevated near the base of the gastric, and poste- 



* Monog. foss. Make. Crustacea of Great Britain, Part I, 1857, p. 191, Pal^ontographical Society of London, 

 t Crust. PodopMhalmaires, Vol. I, p. 62. 

 X Monog. foss. Mai. Crust., etc., p. 9. 



