Cahnterata from the JSvrth Atlantic. 425 



canals, and are upon the manubrium, as in tlie Antho- 

 medusEe. At the end of each o£ the eight canals there is 

 a tentacle. 



I have therefore no hesitation in establishing a new genus 

 for this Tiarid, Avhich seems to belong to the deep inter- 

 mediate waters or mesoplankton of the Atlantic Ocean. 



Bythotiara, gen. nov. 



Characters. Tiarid with four radial canals, which bifurcate 

 and open into the circular canal by eight adradial terminal 

 branches. Four gonads arranged iuterradially along the 

 manubrium. 



Bythotiara Murrayi, sp. n. 



Umbrella nearly as high as broad. Manubrium divided 

 into two regions ; the proximal part receiving the four radial 

 canals is squarish in cross section, bearing the gonads in 

 fonr ridges along the interradial angles. The distal region 

 is smallest, free from gonads. Mouth surrounded by four 

 oral lips. Four radial canals bifurcate close to the manu- 

 brium. Eight long tentacles at the ends of the eight adradial 

 terminal branches. 



I have much pleasure in naming the species after its 

 discoverer Mr. George Murray. 



LEPTOMEDUS^E. 



Thaumantidae. 

 Laodice Chapmani, sp. n. (PI. IX. figs. 1, 2, 3.) 



One specimen of this fine form was obtained in lat. 52° 

 18''1 N., long. 15° 53'-9 W., between 1070 fathoms and the 

 surface. It measured 17x12 milHm. It differs from other 

 species of Laodice hitherto described in the character and 

 distribution of the gonads. The reproductive cells are deve- 

 loped upon four fimbriated processes of the subumbrella 

 situated upon the course of the four radial canals at points 

 rather nearer the manubrium than the umbrella margin in 

 the proportion of 5 : 8. In L. Chapmani the gonads (fig. 2) 

 are far more restricted to one point than in L. cruciata, 

 L. calcarata, or even in L. idothrix, in all of which Atlantic 

 species they extend either to the mauubrium or to the umbral 

 margin. 



Tentacles 32 in number. Over the junctions of the radial 

 with the circular canal are four ocelli, each of which seems 



