22 SIR CHARLES ELIOT 



by STIMPSON is not visible, and the arrangement of branchiae is not quite the same. But 

 though STIMPSON'S description is very slight and superficial, the similarity in colour and 

 in the structure of the frontal veil seems sufficiently great to warrant identification in 

 specimens from the same coast. 



This form offers resemblances to Tritonia (candiella) australis and ingolfiana, but 

 both of these have the first lateral tooth denticulate, and differ in other details. 



Tritoniopsis, gen. nov. 



The teeth of this form seem to differ from those of Tritonia too decidedly to allow 

 of its being included in the same genus. Whereas in Tritonia the median tooth is broad, 

 and the first lateral lower and of a more clumsy form than the others, in Tritoniopsis 

 the median tooth is narrow and pointed, without wings or accessory cusps. The first 

 lateral does not differ markedly from the others, but the outer laterals are very long and 

 almost filamentous in appearance. 



In the only known species there is one longitudinal and several transverse ridges 

 on the back ; the rhinophore sheaths bear appendages resembling branchise. 



I have dedicated the species to Mr BRUCE, leader of the Expedition. 



Tritoniopsis brucei, gen. et spec. nov. 



Three specimens. The label says "April 22, 1904. Fathoms 10. Temperature 

 55 F. Gough Island." 40 20' S., 9 56' W. 



The animals are of a transparent white (in one specimen with a slightly bluish 

 tinge), allowing the yellow viscera to be seen through the integuments. 



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FIG. 15. Branchia. FIG. 16. Frontal veil from below. 



Flos. 15 anil 16. J'ritoniojisis hrwn. 



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The largest specimen is much bent, but would measure about 22 mm. in length if 

 stretched out. The breadth is 8 mm., the height 8 '5. The others are slightly smaller. 

 In all the shape is high and rather narrow, rising up from the head to the centre of the 

 back, and then sloping down to the tail. 



On the dorsal margin, which does not project, are twelve to fourteen branchial tufts 

 (fig. 15), of which the alternate ones are larger and set more inward, whereas the smaller 

 are directed outwards. The longest do not project more than 2 mm. from the body and 

 are stout, but not at all arborescent or foliaceous. They consist of two or three stems, 

 arising from a prominence which hardly amounts to a common stalk. Each of these 



(ROY. soc. EDIN. TRANS., VOL. XLI., 530.) 



