14 STOLICZKA :— TERTIARY 



endopodite possessing a sub-median, slightly oblique, longitudinal groove, and 

 another near the inner margin, which is serrated or denticulate: a character 

 apparently of very rare occurrence in other Canceridce. It is indicated in 

 deHaan's Acanthodes, and with this genus also the form of the third endopodite 

 agrees, possessing two diagonal sulcations on the surface. The antennae must 

 be very small in Galenopsis ; the basilar joint lies in a depression between the 

 well-developed auditory tubercle, the inner edge of the orbit, and the flattened 

 outer side of the large basilar joint of the antennulse; the antennulary pit is 

 narrow and greatly elongated, communicating by an open groove with the orbit ; 

 the inter-antennulary ridge is apparently quite separate from the anterior median 

 projection of the endostome, and this latter is fully as long, or even a little longer 

 than the front margin. 



Locality. — Hala range in Sind, in a white nummulitic limestone. 



Fa/mily^—LUUCOSIDJE. 

 TYPILOBUS, n. gen. 



Carapace transversally oval, moderately convex ; front lobes small, gastric lobe 

 reversely bottle-shaped, truncate below ; hepatic region small, very little elevated ; 

 branchial large, tumid ; cardiac transversally oval, very convex, and circumscribed 

 by a deep sulcus : none of these five principal lobes are sub-divided ; front very 

 narrow, above longitudinally grooved in the middle and slightly projecting at the 

 edge ; orbits close together, small, sub-circular, inner angle with a wide hiatus ; 

 basilar joint of the antennulse slightly ovally rounded, occupying its whole cavity 

 and directly adjoining the inner hiatus of the orbit ; basilar joint of the antennae 

 very small, wedged in between the former joint, the small auditory tubercle and 

 the orbit ; epistome as long as the front margin ; outer maxillipeds long ; the second 

 endopodite is equally broad as the corresponding exoppdite; third endopodite 

 sub-pyramidal, upper end roundly obtuse, all joints smooth, not sulcated; sub- 

 hepatic region very narrow, anterior part of pleural region tumid ; sternum com- 

 paratively broad, with long, narrow sternites. Tail of female about half the length 

 of the body, with sub-parallel sides, consisting of seven joints : tail of male a 

 little longer, narrow, obtuse at the end ; third, fourth, and fifth joints united. 



Although none of the extremities have as yet been found preserved in the 

 single species to be described, this peculiar genus can readily be distinguished from 

 any other by the strict definition of each of the five lobes into which the carapace 

 is usually divided; by the very narrow, and in the middle slightly projecting, front 

 edge and approximate orbits ; by the equal or sub-equal width of the second endo- 

 and exo-podites of the outer maxillipeds, and the sub-pyramidal form of the third 

 endopodite; &c., &c. 



As regards the true classification of the genus, it is for the present somewhat 

 difficult to give a quite satisfactory opinion. The transversally ovate form of the 

 carapace and that of the taO. would apparently indicate a Qanceride Cyclometope. 

 With the Carpilius group agrees the somewhat predominant length of the antero- 

 ateral over the postero-lateral margin; but the form of the marginal spines appears 



