46 P. M. DUNCAN ON THE ECHINODERMATA OF THE 



Family ECHINKLE. 

 Subfamily Temnopleueid^, Desor. 



Temnechinus lineatus, sp. nov. Plate III. figs. 3-5. 



The test is small, depressed, rather pentagonal in outline, and the 

 ambitus is rounded. The actinal surface is slightly rounded from 

 the ambitus to the mouth, but on the whole is flat. The inter- 

 ambulacra are twice the width of the ambulacra at the ambitus, and 

 about one third broader at the actinosome. The pores are in a ver- 

 tical row and slightly oblique, and their zones are sunken. The inter- 

 ambulacra have two rows of primary tubercles, which are small and 

 imperforate. Each row is separated externally by a crowd of closely 

 placed secondaries from the poriferous zone, and by a much wider space 

 from the other row. This space is marked by ridges which radiate 

 from the top and base of the primaries, and which have secondary tu- 

 bercles upon them and between them. The ridges run parallel courses 

 between the distant primaries, and are narrow, but support from 

 four to six secondaries. There are short ridges between the pri- 

 mary tubercles in each vertical series, which also carry one or 

 more secondaries. Transverse and elongated spaces exist on one 

 side of the primary tubercles at the ambitus and elsewhere where 

 this ornamentation is not seen. The primaries of the ambulacra are 

 in two vertical rows, each being close to its poriferous zone. Their 

 ornamentation by ridges and secondaries is the same as that of the 

 interambulacra ; but the ridges which pass off towards the poriferous 

 zone, cross it and separate the pores in vertical series. All this orna- 

 mentation is exsert and the plain surface of the test may be seen 

 between the ridges. Around the base of the boss of the large tuber- 

 cles the ridges often close in and produce a crenulated appearance. 



Height of test -f- inch, breadth T ^ inch. 



Locality. — Mordialloc, No. 1. 



In classifying this species in the genus Temneehinus, I have been 

 led by A. Agassiz, in his admirable criticism on this group of the 

 Temnopleuridse (op. cit. p. 286). He mentions that D'Archiac and 

 Haime have figured from the Nummulitic formation of India a 

 number of species which are usually referred either to Temnopleurus 

 or to Opechinus, but which belong to this same genus Temneehinus. 

 Probably Paracloxecldnus novas, Laube, is one of these, and has 

 had its ornamentation irregularly distributed. 



Suborder CLYPE ASTRIDE. 

 Family EUCLYPEASTRID^E. 



ECHINANTHUS TESTUDINARITTS, Gray. 



A large Echinoderm from the Mitchell-River Tertiaries, in Eastern 

 Victoria, so closely resembles the modern form from Brisbane, 

 Japan, the Sandwich Islands, and California, which has been termed 



