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 



