310 Messrs. J. C. Melvill and R. Standen on 
If slightly local, it is very abundant where it occurs. The 
colour in the var. @ is a subdiaphanous golden brown or 
straw, and there is a very conspicuous suffusion just behind 
the outer lip of deep rufous brown, bifureating over the 
labrum itself. The commoner form is var. 8, larger as a rule, 
and pure milky-white throughout, very smooth and somewhat 
shining. In one or two examples an intermediate form 
seems to occur, the last whorl being here white, obscurely 
bizoned with two clear chestnut lines, or, indeed, occasionally 
trizoned. In fact it is a variable species. 
Terebra helichrysum *, sp.n. (Pl. XXII. fig. 14.) 
T. testa gracillima, multum attenuata, aciculata, nitente ; anfracti- 
bus 22, quorum 34 apicales leves, vitrei, ceteris paullum apud 
suturas gradatis, lete stramineis, supra, juxta suturas, zona 
callosa spiraliter preeditis, hic illic regulariter albo et rufo 
maculatis, deinde, inter costas breves, longitudinales, obtusas, 
nitidas, profunde interstitialiter foraminatis et sulcatis, costis 
anfractus ultimi ad basim evanidis; apertura ovata, parva, labro 
tenui, canali brevi. 
Long. 24, lat. 5 mm. 
Hab. Persian Gulf, Mussandam, 47 fathoms. 
A most elegant species, the tumid callous zone just below 
the sutures delicately variegated spirally with white and pale 
rufous, then obtusely ribbed, the interstices, especially the 
upper row, being deeply pitted. 
Pleurotoma (Gemmula) navarchus fF, sp. n. 
(Pl XOXxa teal») 
P. testa eleganter fusiformi, solida, paullum nitente, pallide cinereo- 
brunnea; anfractibus tredecim, quorum duo apicales nitidi, 
hyalini, perleeves, caeteris apud suturas impressis, ventricosulis, 
infra suturas spiraliter pulcherrime et arcte nodoso-cingulatis, 
nodulis hie illic rufo-maculatis, deinde fortiter uniliratis, simul 
ac infra, juxta suturas, bisulcatis, superficie intermedia lata, 
nitida, longitudinaliter obliquissime costulata, ultimo anfractu 
ceeteros exeequante, infra cingulum liramque spiralem usque ad 
peripheriam levi, deinde anguste sulculoso, infra usque ad basim 
suleulis tornatis, latioribus, liris intermediis regulariter rufo 
maculatis; apertura oblonga, intus planata, labro tenui, sinu lato, 
haud profundo ; columella fere recta, canali subprolongato, 
Long. 64, lat. 18, apertura cum canali 28 mm. longa. 
Hab. Persian Gulf, Gulf of Oman, lat. 25° 19’ N., long. 
58° 10’ E., 140 fathoms. 
* éixpvooy, an everlasting, from the bright rufous spotting. 
}~ vavapxos, an admiral. 
