A Revision of the Genera of the AraneK. 5 of its cranium. The bones associated with the head comprise some of the cervical vertebrse, the greater part of the tail, one scapula and coracoid, the greater part of one wing, remains of the other wing, and one hind foot. The scapula and coracoid are fused together. The humerus, which is imjjerfect disfally, cannot have exceeded 0'07o m. in length, while (as already noted by Lydekker) the respective lengths of the second, third, and fouitli wing-phalanges are OT65 m., O'l-AO m., and O'l/iC m. respectively. The hind foot measures 0'070 m. in length, and, judging from the slenderness of its foes, the hind limb niu^t have been as small and weak as in the other species of Rhamphorliyncliux. Though equally long, the toes are oidy about half as stout as those of another portion of hind limb in the British Museum, which was also })rovisionally ascribed to ^'' lihainplwrhynclius ynindis^^ by Lydekker {loc. cit. p. 33, no. 42737). EXPLANATION OF PLATE L Fiy. \. liliamiiliorliynchuA Geimninf/i, Clever ; palatal a.-pect of skull, nat. size. — Lower Kimnieridgian (Litliofirapliic Stoue ) ; Solenhofen, ]5avaria. bpt., ba?ipter3goid processes ; iov., infraorbital va-cuity; j;n-., iuterpteiygoid vacuity ; »7f., infratemporal vacuitv ; m.i:, maxilla; pa., palatine ; pm.r., premaxilla ; jjt., pterygoid; ptv., posterotemporal vacuity; qu., quadrate; .r, supposed transverse bone. (]5rit. Mus. no. li. 2786.) Fiff. 2. Ditto ; mandible of same specimen, oral aspect, nat. size. Fiff. 3. IVmmphorhynchns lonrjiceps, sp. n. ; skull and mandible, right lateral aspect, nat. size. — Lower Kimmeridgian (Lithographic Stone) ; Eichstjidt, Bavaria, aov., autorbital vacuity ; Itv., lateral temporal vacuity; md., mandible; na., external nares ; orb., orbit ; s., hinder end of mandibular svmphysis. (Brit. Mus. no. 37002.) II. — A Revision of the Genera of the ARANE.E or Spiders with reference to their Type Species. By F. PiCKAHD Cambridge, B.A. 'The following notes contain some important conclusions with regard to the signification and synonymy of various genera and species. Many generic names which liave been treated by authors as either unsuitable or superfluous, or botli, will have to be restored, at all events to the extent of ascertaining what is their type sj)ecies. Such, for instance, are those published by Simon in 1864 and those founded by Templeton and published by Blackwall in the same year. It is p«>ssil>lc that
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