1891.] THE 'challenger' expedition. 439 



8. Pleurotoma (Drillia) crossei. (Plate XXXIV. fig. 8.) 



Testa parva, breviter fusifonnls, alhida ; anfract. 7, supremus 

 Icevis, convexus, cceteri superne leviter concavi, rotunde angulati, 

 infra angulum arcuatim contracti, costis obliquis tenuibiis 

 circiter 15 (in cmfr. idt. inferne attenuatis) instructi, line- 

 isque elevatis ])aucis parum conspicuis infra angulum ornati ; 

 anfr. tdt. inferne valde contractus ; apertura parva, longit. totius 

 ■| adcequans ; labruni supra angidum haudprofunde sinuatum. 

 Longit. 10 milliin., diam. Sf; apertura 4 lotiga, 2 lata. 

 This species has the whorls much contracted at the lower 

 part and prominent at the rounded angle. The riblets are oblique 

 below, and flexuous in the concavity. The spiral lirse are more 

 conspicuous around the lower part of the body-whorl than elsewhere, 

 and altogether absent in the concavity below the sutural line. 



9. Pleurotoma (Drillia) hoylei. (Plate XXXIV. fig. 9.) 



Testa parva, breviter fusifonnls, albida ; anfract. 8, superne 

 oblique concavi, in medio obtuse angulati, infra angulum 

 contracti, vix convexiuscuU, costis oblique flexuosis, prcecipu^e ad 

 angidum (supra et infra mox evanidis) instructi, striisque 

 incrementi tenuissimis sculpti ; apertu^ra parva, longit. totius g 

 paulo superans ; sinus labri mediocriter profundus, in con- 

 cavitate situs. 

 Longit. 9 millim., diam. 3| ; apertura 3| longa, 1| lata. 

 The costse in this species are very short, and soon become obsolete 

 above and below the angle, so that they appear Hke a series of 

 obHque nodules. The absence of spiral sculpture is peculiar. 



10. Pleurotoma (Drillia) WATsoNi. (Plate XXXIV. fig. 10.) 

 Testa parva, breviter fusiformis, alba ; anfr. 6, supremi duo 



(nucleus) Iceves, convexi, cceteri superne oblique cleclives, dein 

 angulati, infra angulum plani, costis tenuissimis obliquis 

 circiter 20 lirisque spiralibus (in anfr. superioribus duo, in 

 ultimo circiter 14) nodose cancellati, supra angulum liris spirali- 

 bus paucis subobsoletis cincti ; anfr. ult. infra medium valde 

 contractus ; sinus 'inediocriter profundus ; labrum arcuatum, 

 prominens. 

 Longit. 6j millim., diatn. 3g ; apertura 2|- longa, 1^ lata,. 

 This shell has a large smooth apex ; the upper slope of the whorls 

 is comparatively smooth, exhibiting only a few (about 4) faint 

 spiral lirse, and the lower portion and the greater part of the body- 

 whorl are covered with a distinct cancellation, the points of inter- 

 section of the oblique and transverse lirse being rather acutely 

 nodulose. 



11. Cancellaria exigua. (Plate XXXIV. fig. 11.) 



Testa minima, elongata, ovata, alba; anfract. 4-5, supremus 

 (nucleus) magnus, Icevis, globosus, cceteri convexi, circa medium 

 liris duobus spiralibus cincti, costis obliquis tcnuibus circiter 12 



