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the combined length of the next two segments. The anterior portion of the ventral surface is 

 produced into a blunt point. The second segment is equal to about two-thirds of the length of 

 the o-enital segment. The third and fourth segments are of equal length and are half the length 

 of the genital segment. The furcal joints are slightly longer than broad, and are as long as the 

 anal segment. 



The antennules are twenty-four-jointed and extend to near the end of the furca. 

 The antennae, mandibles, maxillae and maxillipedes are similar to those of ScolecUhricella 

 obtusifrons Sars. 



The first pair of feet is also similar to that of ScolecUhricella obtusifrons. 



The exopodite of the second pair of feet is three-jointed and the joints are moderately 

 wide. The surface of the second and third joints is well clothed with fine spinules. The second 

 joint of the endopodite is furnished with three transverse rows of moderately long spinules. 



The exopodite of the third pair of feet is three-jointed, and the surface of the joints is 

 closely set with fine points. The distal end of the surface of the second joint is furnished with 

 a horse-shoe-shaped row of small stout spines. The surface of the third joint has two horse- 

 shoe-shaped rows of spines. The second and third joints of the endopodite are each furnished 

 with two transverse rows of spines. 



The fourth pair of feet was damaged. 



The fifth pair of feet is represented by two free joints attached to a basal part. The 

 second free joint is about twice the length of the first and is narrowly pointed at the apex. 

 The second joint is furnished with one strong inner-edge spine, which is equal to two-thirds 

 of the length of the joint. The posterior surface of the spine is fringed with fine spines. The 

 apex of the joint bears one small spine. The outer margin is furnished with two spines, one 

 is about a third from the base, and the other is close to the apex. (Plate XXX, fig. 17). 



The male is unknown. 



This form is easily distinguished from any of the other species by the short, stout, bifurcate 

 filaments of the rostrum, by the broad and slightly emarginate outline of the distal end of the 

 last thoracic segment when viewed from the side, and by the armature of the second free joint 

 of the fifth feet. 



Occurrence. - - One specimen was found in the plankton collected with the Hensen 

 vertical net at Station 148, 1000 metres to the surface. 



The species is so named in compliment to Lieutenant G. F. Tydemax who commanded 

 the 'Siboga' during the expedition. 



14. Scolecitliricclla curticauda nov. sp. Plate XXX, figs. 1 — 9. 



Female — length 6 mm. 



Seen from above, the body appears elongate and narrow. The head is completely fused 



with the first thoracic segment and its combined length is twice that of the three following 



thoracic segments. The last thoracic segment is slightly produced and the posterior margin is 



rounded. The fourth and fifth thoracic segments are completely fused, but the junction of the 



segments is indicated by a faint thickening of the exoskeleton. Viewed from the side, the dorsal 



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