OENONE TELURA. 337 



on the left. Each third maxilla has distally a very stout, curved claw and, proxi- 

 mad of that, five small teeth. Each second maxilla has an arm extending along 

 the mesal side of maxilla I and a shorter, distally blunt, arm extending down 

 the ectal side; along the mesal arm is a series of stout teeth of which the next 

 to the most anterior is a long, stout hook much exceechng the others in size; 

 on the right plate is a total of eleven or twelve teeth, and on the left but seven, 

 the teeth in each case extending to the proximal end of the inner branch, which 

 is much shorter on the left plate. The carriers of the first maxillae are produced 

 caudad as exceedingly long and slender, tendon-Uke processes which bend abruptly 

 mesad and unite at the caudal end; at the anterior end each widens into a tri- 

 angular plate with base cephalad; behind each of these anterior plates the car- 

 rier is concavely excised, as usual, and bears a forwardly directed process or tooth. 

 Each of the maxillary plates is extended ectad into a thin process, that of the 

 right being the larger and more conspicuous. The right plate proper is small, 

 scarcely larger than its clavate ectal process, and bears along its mesal border 

 a series of six teeth, with at the distal end a seventh, somewhat larger, hooked 

 tooth. The left plate is much larger, being extended cephalad into a stout 

 smooth hook, and bearing along the mesal edge proximad of this a series of 

 three teeth followed by a long smooth raised edge or ridge. (Plate 62, fig. 2). 



Locality. Marshall Islands. 12 fms. January, 1900. One specimen 

 which came up on the anchor of the Albatross. 



This species in general structure and appearance is close to 0. lucida Savigny, 

 type-species of the genus. It presents no trace of obscure antennal nodules 

 indicated in some specimens of lucida, but apparently subject to retraction like 

 true nuchal organs. The maxillae are very similar to those of 0. lucida (0. 

 diphyllidia Schmarda) as figured by Ehlers (Mem. M. C. Z., 1887, 15, pi. 34, 

 fig. 6) and by WUley (Ceylon pearl oyster fisheries report, 1905, pt. 4, pi. 5, 

 fig. 107) and as exhibited in West Indian specimens, but differ in various details. 

 In maxilla II the great fang is the one next to the most anterior one instead of 

 the most anterior; the third right maxilla has but five teeth, exclusive of the 

 large fang, instead of seven or eight, though five may occur in some specimens 

 of lucida, and is in this regard the same as the left one instead of having more 

 numerous teeth. The left maxilla I has but three teeth and a smooth ridge in- 

 stead of eight teeth. The ectal process of the plate of I is differently shaped. 

 Each mandible does not project angularly ectad at its distal end on the outer 

 side as figured for lucida. The crochets of lucida do not show the same inequality 

 in the terminal teeth, with the larger one bifid. A most striking and important 



