NICOLEA GALAPAGENSIS. 427 



above running to a subacute point. The anus is vertically somewhat elongate 

 and is bordered by a series of small rounded folds or tubercles. 



Locality. Panama: Taboguilla Island. Shore. 31 October, 1904. Two 

 specimens. 



NiCOLEA GALAPAGENSIS, sp. nOV. 



Plate 80, fig. 1-3. 



The general color at present is light brown, in some of a weak greenish 

 tinge. The tentacles are more yellowish and the branchiae still paler. 



The body is broadest toward the anterior end of the thorax, where it is also 

 thickest dorsoventrally. From there the body narrows conspicuously, the 

 abdominal region being long and slender. The body is in each part nearly 

 cylindrical, the dorsum being strongly convex and the venter more weakly so. 

 The width at the anterior end in one specimen is 6.5 mm., and the depth the 

 same, or slightly greater. The width in the abdominal region, excepting the 

 extreme anterior and posterior ends, is mostly from 2.7 to 3 mm. The total 

 length cannot be ascertained, as the caudal part is broken off. Another specimen, 

 which is complete and has a maximum width of thorax of 4.2 mm., has a total 

 length, exclusive of the tentacles, of near 70 mm. The tentacles, fully extended, 

 measure about 25 mm. in length. This specimen consists of ninety-three somites. 



The prostomium forms a prominent upper hp which protrudes over and at 

 the sides of the mouth in the form of a hollow half cylinder. Back of this part 

 is a narrow transverse fold, or ridge, which is conspicuously crenulate along its 

 anterior edge and bears along this edge the moderately numerous long tentacles. 

 The tentacles are slender and of only moderate length. They present the usual 

 longitudinal furrow along one side. 



The peristomium presents below a prominent median lobe in the form of a 

 conspicuous lower lip, the cephahc edge of which is mesally concave, with the 

 margin each side of the concavity slanting obliquely ectocaudad. 



On each side of the third segment arises a large, foliaceous, membranous 

 flap, which extends obhquely across to end on the second segment. Each of 

 these lobes is transversely ovate in outhne, with the narrow end mesad. The 

 lobe is crossed by numerous white lines, which bifurcate cephalad as in bilobaia. 

 (Plate 80, fig. 2). There is no median fold from the thu-d segment extending 

 forwards over the second such as described by Augener for AustraUan specunens 

 of bilobata, the separation of these segments ventrally being clear, though the 

 second is reduced. 



