BY F. BLOCHMANK. 113 



1913. 



In outline, slender to broad pearshaped, broadest in tlie 

 middle. Beak short, with slightly pronounced edges, 

 moderately sharply curved dorsalwards. Deltidial plates 

 touching each other. Lateral edges in the neighbourhood 

 of the hinge with a weak convexity directed dorsalwards, 

 otherwise straight. Ventral valve, somewhat deeper than 

 the dorsal; both equally arched. Growth-striae invalid. 

 Colour, pure white, very transparent. The Brachial ap- 

 paratus of both the new exmples (fig. 1, 5, and 6) cor- 

 responds essentially with the charact-ers of the Challenger 

 example. In the shell illustrated in fig. 6, the bridge of 

 the Brachial apparatus is somewhat more strongly bent 

 ventralwards, and at the front edge somewhat more ex- 

 cavated than in the Challenger specimen- (The |>eculiar 

 yellowish colour of the Challenger example has arisen, as 

 the present fresh shells show, through some circumstance 

 after death of the animal.) The number of pores 



of the one example (fig. 1 and 2) amount to 136, of the 

 other ("fig. o and 4) to 104, in the Challeuger example to 

 120-130. The inner surface of the sihells shows the pre- 

 sence of mosaic, which is found in most of the Liothyrina, 

 as illustrated by me for L. vitrea (1908, Pi. 37, fi*?. 15). 

 T. fulva has no cirri bases, and in both rows of cirri slen- 

 der spicula. (As the examples at my disposal are dry, the 

 spicula of the arms are partly broken, and also somewhat 

 out of position. I am, therefore, unable to give a good 

 illustration.) The headplates on the dorsal side of the 

 sidearms in the back half are stout. and plentifully 

 branched, and fairly thickly thomed, but in the front 

 half small, with few slender extensions, sparingly thorned. 

 In the body-wall, pai'ticularly in the dorsal part, are found 

 stout strongly thorned plates, differing somewhat in for- 

 mation, in the two examined examples (fig. 12 a and b). 

 The mantle contains only in the course of the sinus^ 

 and nearly to the extreme ends of the sinvis-branches, 

 simple fine spicula; on this account the coui-se of the 

 sinus, in dry examples, stands out very distinctly. 



Dimensions of the two illustrated examples in rnillimetres. 



Fig. 1 and 2. Fig. 3 and 4. 



Leui^Hh 17-0 15-0 



Breadth 11 -5 12-0 



Thickness 9-0 9-0 



Habitat . 3 miles east of Schouten Island, on the East 

 Coast of Tasmania. Depth 73 m. (40 fathoms). This 



