NICOLEA PROFUNDI. 429 



There must, for the present, remain a Uttle doubt about the precise identity 

 of Grube's bilobata. I have accepted it as described by Augener. The present 

 species seems to differ clearly from the Australian form described by that author 

 in having the superior teeth of the uncini in but a single series instead of in two, 

 in wholly lacking any ventral fold on the third somite, as well as in the much 

 larger size. N. bilobata is evidently subject to considerable variation in many 

 of its characters; and only the examination of extensive material from various 

 locaUties will make it possible to determine its actual limits. 



NiCOLEA PROFUNDI, Sp. nOV.^ 



Plate 79, fig. 9. 



The general color of the body is carneous. The setae are pale yellow. 



The body has the general form of N. taboguillae, sp. nov., but with the abdo- 

 men proportionately broader and the caudal portion of the thorax more slender. 

 The type has a maximum width of 4.2 nmi., exclusive of the parapodia, with the 

 abdomen in the middle region 3 mm. wide. The length of the type to the end 

 of the thoracic region is 21 mm., and the total length near 48 ram. The total 

 number of somites is forty-eight to fifty, being thus much less than in the two 

 preceding forms. 



The prostomium is decidedly shorter than in A^. galapagensis. It is bent 

 around the mouth above and laterally. It has a transverse furrow above, in 

 which the tentacles are inserted. Behind this furrow is a conspicuous transverse 

 fold, or ridge, on which no eye-spots are detectable. The tentacles are few and 

 form scarcely more than a single, uneven, transverse series. They seem to be 

 short, but are mostly missing from the types. 



The ventral lobe, or lip, formed by the peristomium, is proportionately 

 broader than in either of the preceding species, and is narrower proxunally than 

 distally instead of widening proximad. The distal edge is nearly straight, with 

 the lateral corners rounded. 



The second somite is longest laterally. The third somite has neither lateral 

 nor ventral flap or fold. 



No segmental papillae are evident. 



The branchiae are missing from the types. 



There are seventeen setigerous somites, the setae beginning on the fourth 

 and the uncini on the fifth somites, as usual. 



' profundum, depth of the sea. 



