558 " THETIS " SCIENTIFIC RESULTS. 



only indication of the pouch is a very slight depression of the 

 upper euds of the five ambulacra. The dimensions of the female 

 are as follows : — length, 3'3 mm.; width, 2*4 mm.; height of test, 

 l"7mm.; distance of anterior edge of actinostome from anterior 

 end of test, l-o mm.; diameter of actinostome, "8 mm. Males are 

 £t trifle smaller. Pedicellarise of two kinds, tridentate and 

 ophicephalous ; former very infrequent, the valves (Plate Iviii., 

 fig. 3) with remarkably wide bases and expanded, coarsely dentate 

 tips ; ophicephalous pedicellarise (Plate Iviii, figs, 1 and 2) with 

 enormously enlarged loops and powerful dentate jaws. 8pines 

 with somewhat flaring tips (Plate Iviii., fig. 4), made up of eight 

 pointed rods. Colour, very pale brown. 



85 specimens from Station 13. Off Cape Three Points, 41-50 

 fathoms ; sticky mud and shell. 



2 specimens from Station 57. Off Wata Mooli, 54-59 fathoms;. 

 all mud. 



Among the novelties taken by the " Thetis," none is more 

 interesting than this remarkable little Echinoid, the only Ciype- 

 astroid known in which the test of the female is profoundly 

 modified for the purpose of caring for the young. On account 

 of the complete absence of petals I was at first inclined to 

 establish a new genus for this peculiar species, but as the species 

 of Fihularia and Echinocyamus have the petals more or less 

 reduced, it has seemed that this character can hardly be used for a 

 generic difference. In its internal anatomy (Plate Iviii., figs. 10 

 and 11) this species is a typical Fihularia, but reveals certain 

 peculiarities of its OM'n. The posterior position of the mouth, 

 the short intestine, and the powerful jaws, forming a lantern 

 which is bilaterally symmetrical but radially most asymmetrical, 

 are all noteworthy features. Only two of the females actually 

 had young in the brood-pouch ; in each case there were two 

 young ones present. These young were nearly spherical, and. 

 measured about -5 mm. in diameter. It is worthy of remark 

 that this species was found on muddy, rather than sandy, 

 bottom, in company with Echinocyamus and seven other 

 Echinoderms. 



ECHINANTHUS TESTUDINARI CIS. 



Echinanthus testudinarius, Gray, Proc. Zool. Soc. 1851, p. 35. 



1 specimen from Station 36, Off Botany Bay, 20-23 fathoms; 

 sand to rock. 



5 specimens from Station 41. Off Wata Mooli, 52-71 fathoms; 

 soft mud. 



7 specimens from Station (?) 



