20 TH. MORTENSEN, ECHINOIDEA. 



From the same locality, together with the specimen of Fibularia volva, there 

 is a small specimen, 7 mm long, of another species of Fibularia, which is, in any 

 case, related to F. cribellum De Meijere, but may perhaps be a new species. I do 

 not think it possible to reach a definite conclusion about it at present, and as it is 

 an immature specimen and, moreover, in a poor state of preservation I shall give 

 only these remarks about it at the present occasion. 



In any case it is proved herewith that at least two different species of Fibu- 

 laria occur at the West Australian coast, none being known from there previously. 



14. Breynia australasiae (Leach). 



Pl. V, Figs. 2, 18, 19, 22. 



Breynia australasiae. Agassiz. 1873. Revision of the Ecliini, p. 578, Pl. XV, a, 7—9, Pl. XXV, 32, 

 Pl. XXVI, 20. 

 » » De Meijere. 1904. »Siboga» Echinoidea, p. 192. 



» » Döderlein. 1914. Echinoidea. Fauna S.W. Australiens, p. 491. 



» » IT. L. Clark. 1914. Echinoderms W. A. Museum, p. 169. 



» II. L. Clark. 1917. Hawaiian a. o. Pacific Echini. The Echinoneidae .... 



Spatangidae. Mem. Mus. C. Z. XLVI, p. 250, Pl. 146, 31. 



48 miles S.W. of Cape Jaubert, 12 m. (3/VI. 1911), 10 large and 3 smaller specimens, 

 45 » W.S.W. » » 24 » (8— 14/VII. 1911), 1 large specimen, 80 mm long. 



There are also some dried specimens, mainly naked tests, from Cape Jaubert, 

 probably from the beach. 



In the small specimens (13 — 14 mm long) the genital pores have not been formed. 

 The inner fasciole is as yet distinct only in the part near the apical system. 



The pedicellariae. Besides the forms described by H. L. Clark (1917), I have 

 found globiferous pedicellariae in some specimens, especially in the large specimen from 

 24 m. They were found only in the posterior ambulacra on the naked part between the 

 peristome and the hind end, and always along their outer side, sometimes also a few 

 among the spines to the outside of these ambulacra. They are of a very simple structure 

 (Pl. V, Figs. 2, 22), without any finer structure at the point; the stalk is quite short. 

 In these ambulacra also the ophicephalous pedicellariae arenumerous; it is a remark- 

 able fact that those of the young specimens differ in their structure quite noticeably 

 from those of the grown specimens (Pl. V, Figs. 18—19). In the very large rostrate 

 pedicellariae found mainly ronnd the peristome the basal part of the valves is remarkably 

 flat, and consists of a very open, irregular meshwork outside, while the inside is 

 filled with a fine-meshed network. 



