J. W. Gregory — Australian Echinoidea. 483 



Gen. Echinolampas, Gray, 1825. 



Echinolampas ovidum, Laube. 



Sitz. k. Ak. Wiss. Wien. lix. Abth. i. 1869, pp. 191-2. 



Laube in 1869 briefly described a specimen from the Murray 

 Cliffs, which he temporarily named E. ovulum as it was too imperfect 

 for formal diagnosis. Prof. Duncan subsequently referred a specimen 

 from Bairnsdale (B.M. E 1107) to this species. Laube's type is 

 in the Palaaontological Collection of the Hot' Museum in Vienna, and 

 owing to the kindness of the Director, Dr. Fuchs, I recently had the 

 opportunity of examining it ; there can be no doubt of the correctness 

 of Prof. Duncan's identification. As the species has hitherto been 

 neither figured nor described, this opportunity may as well be taken 

 for doing so : in the following diagnosis both specimens have been 

 used. 



Echinolampas ovidum, Laube. PI. XIII. Figs. 7-8. 



Laube, Sitz. k. Ak. Wiss. Wien. Bd. lix. Abth. i. 1869, pp. 191-2. 

 Duncan, Q.J.G.S. 1877, xxxiii. p. 66 ; 1887, xliii. p. 420. 



Outline seen from below an elongated pentagon with rounded 

 angles ; sides tumid, rounding off into the concave actinal surface : 

 tapering posteriorly to a slight rostrum, at the end of which is the 

 anus : well rounded in front. 



In elevation it is high, with the vertex behind the apical disc. 

 Vertex blunt, at the posterior third of the test. 

 Apical system anterior : details unknown. 



Ambulacra with lanceolate petals, open below. The posterior 

 pair the larger. Pores yoked. The petals extend more than two- 

 thirds to the ambitus. In the posterior ambulacra the pore areas 

 are equal (as in Palo2olampas) ; in the anterior unequal (as iu 

 Echinolampas) . 



Peristome : mouth rounded pentagonal : broader than long : 

 slightly anterior : at deepest part of the actual concavity. 

 Floscelle rudimentary, formed by slight bourrelets. 

 Anus elliptical, transverse : situated at the end of a slight rostrum. 

 Tuberculation : of close-set, uniform granules with impressed 

 areolae. 



Dimensions. Laube's type. 



Length 64 mm. 



Width: at posterior third 56 „ 



,, anterior third 52 „ 



Height 36-5 ,, 



Apical disc: distance from anterior end ... 25 ,, 



Echinolampas posterocrassus, sp. nov. PI. XIII. Figs. 4-6. 



Form a depressed rounded pentagon : sides tumid. Apex a little 

 behind the calycinal system ; anterior slope gentle. 



Apical system precentral ; basal pores large : those of the posterior 

 pair the further apart. 



Ambulacra long, narrow: slightly petaloid but almost parallel: 



