480 Mr. 0. P. Hay on 



by Walker, except that they are of a reddish brown, reddish 

 on the thorax. The abdomen has a row of spines pointing 

 backwards on the median line and three rows of large black 

 oblong spots on the back and sides ; the median row macular, 

 the lateral rows partly connected behind, and each marked 

 rather behind its centre with a large reddish dot. On the 

 basal segments the black markings are more or less connected 

 at the base of the segments. 



Enyaliopsis Petersii. 



Hetrodes Petersii, Schaum, Ber. Ver. Akad. Berl. 1853, p. 777 ; Peters's 

 Reise Mossamb. v. p. 119, pi. vii. fig. 7 (1862). 



1, Pretoria {Distant) ; 3, Barberton {Rendall) ; 2, Fort 

 Johnston, Nyasaland [Rendall) ; 1, Angola {Monteiro). 



The frontal horn in some of these specimens is shorter and 

 broader than usual. There are two immature specimens 

 among them. 



Acanthoproctus Howarthce. 



Acanthoproctiis Hoioarthee, Kirb. Ann. & Mag. Nat. Hist. (7) iiL 

 pp. 101, 145 (1899). 



1, Brak Kloof, near Grahamstown. 



The types were received from E. Karoo, Cape Colony. 



LXV. — On one little-hnown and one hitherto unknown 

 iSptcies of Saurocephalus. By O. P. Hay *. 



The fish Saurcccphalus hmciformis was first described and 

 named by Dr. Richard Harlan in 1824 f. This description 

 and the accompanying figures were reprinted in 1835 in the 

 same author's ' Medical and Physical Researches ' \. The 

 specimen on which the genus and species were based had 

 been collected about twenty years previously, by Lewis and 

 Clark, at some locality probably in North-eastern Nebraska. 

 It consisted of the greater portion of the left maxilla; but 

 was described by Harlan as belonging to the lower jaw. He 

 also regarded it as having belonged to a reptile allied to 

 Ichthyosaurus. Louis Agassiz first recognized the ichthyic 



* From the ' American Journal of Science,' April 1899, pp. 299-304. 

 t Jouru. Acad. Nat. Sci. Philad. (1) iii. pp. 331-3ci7, pi. xii. ligs. 1-6. 

 \ Med. Phys. Res. pp. 362-306, pi., figs. 1-5. 



